SCHEDULE 14A
                                 (Rule 14a-101)

                     INFORMATION REQUIRED IN PROXY STATEMENT

                            SCHEDULE 14A INFORMATION
Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Filed by the Registrant [X]
Filed by a Party other than the Registrant [  ]

Check the appropriate box:
[X] Preliminary Proxy Statement. [ ] Confidential, for Use of the Commission
                                     Only (as permitted by Rule
14a-6(e)(2)).
[   ] Definitive Proxy Statement.
[   ] Definitive Additional Materials.
[   ] Soliciting Material Pursuant to Rule 14a-12.

                                  LABONE, INC.
--------------------------------------------------------------------------------
                (Name of Registrant as Specified In Its Charter)

--------------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box): 
      [ ] No fee required.
      [X] Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and
          0-11.

1)   Title of each class of  securities  to which  transaction  applies:  common
     stock, par value $0.01 per share

2)   Aggregate number of securities to which transaction applies:

     17,500,766  shares of common stock and 1,610,212 options to purchase common
     stock.

3)   Per unit price or other underlying value of transaction  computed  pursuant
     to Exchange  Act Rule 0-11 (set forth the amount on which the filing fee is
     calculated and state how it was determined): [X]

     The filing fee was determined  based upon the sum of (A) 17,500,766  shares
     of common stock  multiplied by $43.90 per share and (B) options to purchase
     1,610,212  shares of common stock  multiplied by $20.17 per share (which is
     the difference  between $43.90 and the weighted  average exercise price per
     share).  In accordance  with Exchange Act Rules  14a-6(a) and 0-11(c),  the
     filing fee was determined by calculating a fee of $117.70 per $1,000,000.00
     of the aggregate merger consideration of $800,761,603.44.

4)   Proposed maximum aggregate value of transaction: $800,761,603.44

5)   Total fee paid: $94,249.65
     [ ] Fee paid previously with preliminary materials.

     [ ]  Check box if any part of the fee is offset as provided by Exchange Act
          Rule  0-11(a)(2)  and identify the filing for which the offsetting fee
          was paid  previously.  Identify  the previous  filing by  registration
          statement number, or the Form or Schedule and the date of its filing.

          1) Amount Previously Paid:
             -----------------------------------------------------
          2) Form, Schedule or Registration Statement No.:
             -----------------------------------------------------
          3) Filing Party:
             -----------------------------------------------------
          4) Date Filed:
             -----------------------------------------------------




                                          PRELIMINARY COPY-SUBJECT TO COMPLETION

                               [LABONE, INC. LOGO]

                                                                 _________, 2005

Dear Shareholder:

     You are cordially  invited to attend a special  meeting of  shareholders of
LabOne,  Inc. ("LabOne") to be held on _________ ____, 2005 at _____ a.m., local
time, at LabOne's  corporate  headquarters  at 10101 Renner  Boulevard,  Lenexa,
Kansas 66219.

     At the  special  meeting,  you will be asked to  consider  and vote  upon a
proposal to approve an Agreement and Plan of Merger, dated as of August 8, 2005,
that we entered into with Quest  Diagnostics  Incorporated  and its wholly-owned
subsidiary,  Fountain,  Inc. Under the merger agreement,  Quest Diagnostics will
acquire LabOne by means of a merger of Fountain, Inc. with and into LabOne. As a
result of the merger,  each issued and outstanding  share of LabOne common stock
(other  than  dissenting  shares)  will be  converted  into the right to receive
$43.90 in cash, without interest and less applicable tax withholding.

     The Board of  Directors of LabOne has  approved  the merger  agreement  and
determined  that the merger is advisable and in the best interests of LabOne and
its shareholders, and unanimously recommends that you vote "FOR" the approval of
the merger agreement.

     Your vote is  important.  The  affirmative  vote of the holders of at least
two-thirds of the  outstanding  shares of LabOne's common stock entitled to vote
at the special meeting is required to approve the merger  agreement.  All of the
directors and executive officers of LabOne, owning an aggregate of _____________
shares, or ________% of outstanding  shares,  have indicated that they intend to
vote for approval of the merger agreement.

     Shareholders are urged to read carefully the accompanying  proxy statement,
which contains a detailed description of the merger and related matters. You may
also obtain more information  about LabOne from documents we have filed with the
Securities and Exchange Commission.

     Whether or not you plan to attend the special  meeting  personally,  please
complete,  sign and date the enclosed proxy card and mail it as soon as possible
in the  enclosed  postage-paid  envelope,  or cast your vote via the Internet or
telephone as soon as possible.  If you attend the special meeting,  you may vote
in person if you wish, even if you have previously  submitted your proxy. If you
receive  more than one proxy card  because  you own shares  that are  registered
differently,  please  vote all of your  shares on all of your proxy  cards.  You
should not send in the  certificates  for your shares of common  stock until you
receive specific instructions at a later date.

     We thank you for your prompt  attention to this matter and appreciate  your
support.

                                    Sincerely,


                                    W. Thomas Grant, II
                                    Chairman of the Board, President
                                    and Chief Executive Officer






     The  accompanying  proxy statement is dated _____,  2005 and is first being
mailed to LabOne shareholders on or about ____________, 2005.




                                  LABONE, INC.

                                 --------------

                    NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
                       To be held _____________ ____, 2005

To the Shareholders of LabOne, Inc.:

     A Special Meeting of Shareholders of LabOne,  Inc.  ("LabOne") will be held
at 10101 Renner Boulevard,  Lenexa,  Kansas on ___________ ____, 2005, at ______
a.m. local time, for the following purposes:

     1.   To consider and vote upon a proposal to approve the Agreement and Plan
          of Merger,  dated as of August 8,  2005,  by and among  LabOne,  Inc.,
          Quest Diagnostics  Incorporated and Fountain,  Inc. pursuant to which,
          upon the merger becoming  effective,  each share of common stock,  par
          value $0.01 per share,  of LabOne  (other than shares held in treasury
          by LabOne, shares owned by LabOne subsidiaries,  shares owned by Quest
          Diagnostics,  Inc.,  or  Fountain,  Inc.  or by  shareholders  who are
          entitled to and properly demand  dissenter's rights in compliance with
          all of the required  procedures  under Missouri law) will be converted
          into the right to receive $43.90 in cash, without interest;

     2.   To consider and vote upon any proposal to adjourn the special meeting,
          if necessary or appropriate,  to solicit  additional  proxies if there
          are not sufficient  votes for approval of the merger  agreement at the
          special meeting; and

     3.   To  transact  such other  business  as may  properly  come  before the
          special meeting or any  adjournments or  postponements  of the special
          meeting.

     The Board of Directors has fixed the close of business on ___________, 2005
as the record date for the  determination  of  shareholders  entitled to receive
notice  of  and to  vote  at the  special  meeting  and  any  postponements  and
adjournments  thereof.  A list of  shareholders  entitled to vote at the special
meeting will be  available  for  examination  by LabOne's  shareholders  for any
purpose  germane to the  special  meeting (i) at the  special  meeting  upon the
request of a LabOne  shareholder  or (ii) for a period of ten (10) days prior to
the  special  meeting  during  ordinary  business  hours at  LabOne's  principal
executive offices at 10101 Renner Boulevard, Lenexa, Kansas 66219.

     Holders of  LabOne's  common  stock  entitled  to vote on the  proposal  to
approve the merger  agreement who do not vote in favor thereof have the right to
receive  payment  of the fair value of their  shares  upon  compliance  with the
provisions  of Section  351.455 of the General and Business  Corporation  Law of
Missouri (the "MGBCL"),  the full text of which is included as Appendix C to the
proxy statement attached to this Notice of Special Meeting of Shareholders.  For
a summary of the dissenters' rights of LabOne's shareholders, see "THE MERGER --
Dissenters' Rights" in the proxy statement.  Failure to comply strictly with the
procedures set forth in Section 351.455 of the MGBCL will cause a shareholder to
lose dissenters' rights.

     You are cordially invited to attend the special meeting.  However,  whether
or not  you  plan  to be  personally  present  at the  special  meeting,  please
complete,  sign and date the enclosed  proxy card and promptly  return it in the
envelope  provided or vote via the  Internet or  telephone,  as specified on the
proxy card. If you sign,  date and mail your proxy card without  indicating  how
you wish to vote,  your vote will be counted as a vote in favor of  approval  of
the  merger  agreement  and in favor of any  proposal  to  adjourn  the  special
meeting,  if  necessary.  If you fail to return your proxy card, do not vote via
the  Internet or  telephone  and do not attend the  special  meeting and vote in
person,  or fail to instruct your broker or bank how to vote your shares if your
shares are held in "street name", it will have the same effect as a vote against
the  approval  of the merger  agreement,  but will not affect the outcome of the
vote regarding the adjournment of the special meeting, if necessary.  No postage
is necessary if mailed in the United States.  If you are a shareholder of record
and attend the meeting, you may revoke your proxy by voting in person.




                                    By Order of the Board of Directors,

                                    W. Thomas Grant, II
                                    Chairman of the Board, President
                                    and Chief Executive Officer
Lenexa, Kansas
_____________ ____, 2005





                                TABLE OF CONTENTS


QUESTIONS AND ANSWERS ABOUT THE MERGER..................................iii

SUMMARY TERM SHEET.....................................................viii
  The Companies........................................................viii
  The Special Meeting....................................................ix
  The Merger..............................................................x

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS.................1

THE COMPANIES.............................................................2
  LabOne, Inc.............................................................2
  Quest Diagnostics Incorporated and Fountain, Inc........................2

THE SPECIAL MEETING.......................................................2
  Date, Time and Place of the Special Meeting.............................2
  Matters to Be Considered at the Special Meeting.........................2
  Record Date for the Special Meeting.....................................2
  Quorum..................................................................3
  Votes Required for Approval.............................................3
  Proxies.................................................................3
  Solicitation of Proxies.................................................4

THE MERGER................................................................5
  Background of the Merger................................................5
  Recommendation of LabOne's Board and Reasons for the Merger.............9
  Opinion of LabOne's Financial Advisor..................................12
  Interests of Certain Persons in the Merger.............................17
  Regulatory Approvals...................................................21
  Certain U.S. Federal Income Tax Consequences...........................21
  Dissenters' Rights.....................................................23
  Source of Funds........................................................24
  Delisting and Deregistration of Our Common Stock.......................24
  Anticipated Accounting Treatment.......................................24
  Effect on LabOne Convertible Debentures................................24

THE MERGER AGREEMENT.....................................................25
  Effective Time.........................................................25
  Merger Consideration...................................................25
  Conversion of Shares; Procedures for Exchange of Certificates..........25
  Treatment of Outstanding Stock Options.................................26
  Representations and Warranties.........................................27
  Conduct of Business Pending the Merger.................................28
  Indemnification and Insurance..........................................30
  No Solicitation by Us..................................................30
  Employee Benefits......................................................32
  Other Covenants........................................................33
  Conditions to the Completion of the Merger.............................34
  Termination............................................................35
  Termination Fees and Expenses..........................................36
  Amendment and Waiver...................................................37

MARKET PRICES AND DIVIDENDS..............................................38

SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT...........38

SHAREHOLDER PROPOSALS....................................................40

WHERE YOU CAN FIND MORE INFORMATION......................................40

Appendix A - Agreement and Plan of Merger

                                       i


Appendix B - Opinion of J.P. Morgan

Appendix C - Section  351.455 of the Missouri  General and Business  Corporation
             Law


                                       ii




--------------------------------------------------------------------------------
                                  LABONE, INC.

                                 PROXY STATEMENT

                         SPECIAL MEETING OF SHAREHOLDERS

                               _____________, 2005

                     QUESTIONS AND ANSWERS ABOUT THE MERGER

     The following  questions and answers are provided for your  convenience and
briefly  address some commonly asked  questions about the merger and the special
meeting of LabOne shareholders.  These questions and answers may not address all
questions  that may be  important  to you as a LabOne  shareholder.  Please also
consult  the  more  detailed  information  contained  elsewhere  in  this  proxy
statement, the appendices to this proxy statement, and the documents referred to
in this proxy statement.

     Except as otherwise  specifically  noted in this proxy  statement or as the
context  otherwise  requires,  "we," "our," "us" and similar words in this proxy
statement refer to LabOne, Inc. and its subsidiaries.  In addition, we sometimes
refer  to  LabOne,  Inc.  as  "LabOne"  or the  "Company".  We  refer  to  Quest
Diagnostics  Incorporated  as  "Quest  Diagnostics"  and to  Fountain,  Inc.  as
"Fountain."

     Q:    WHAT AM I BEING ASKED TO VOTE ON?

     A:    You are  being  asked  to vote  upon a proposal to  approve  a merger
agreement  that  provides  for the  proposed  acquisition  of  LabOne  by  Quest
Diagnostics,  and to grant the persons named as proxies discretionary  authority
to vote to adjourn the special meeting, if necessary or appropriate,  to solicit
additional  proxies in the event that there are not sufficient  votes to approve
the merger agreement.  The proposed  acquisition would be accomplished through a
merger of Fountain,  a wholly-owned  subsidiary of Quest  Diagnostics,  with and
into LabOne.

      Q:    WHERE AND WHEN IS THE SPECIAL MEETING?

      A:    The  special meeting  will take  place at  LabOne's  corporate head-
quarters  at  10101 Renner Boulevard, Lenexa, Kansas 66219, on ___________ ____,
2005, at ______ a.m. local time.

      Q:    WHAT WILL LABONE'S SHAREHOLDERS RECEIVE IN THE MERGER?

      A:    As  a  result of the merger, our shareholders will receive $43.90 in
cash, without  interest  and less any applicable tax withholding, for each share
of LabOne common stock they  own (other than dissenting shares). See "THE MERGER
AGREEMENT - Merger Consideration."

      Q:    WHAT DO I NEED TO DO NOW?

      A:    We  urge  you to read this proxy statement carefully and to consider
how the merger  affects  you.  Then just mail your  completed,  dated and signed
proxy card in the enclosed return envelope as soon as possible,  or vote via the
Internet or telephone,  so that your shares can be voted at the special  meeting
of our  shareholders.  If you hold your  shares in  "street  name",  follow  the
instructions from your broker on how to vote your shares.  Please do not send in
your stock certificates with your proxy.

      Q:    HOW DOES LABONE'S BOARD OF DIRECTORS RECOMMEND I VOTE?

      A:    At  a  meeting  held  on August 5, 2005, LabOne's board of directors
unanimously  approved the merger agreement and declared the merger agreement and
the merger  advisable and in the best interests of LabOne and its  shareholders.
Our board of directors  unanimously  recommends  that you vote "FOR" approval of
the merger  agreement and "FOR" approval of the proposal to grant  discretionary
authority  to the  persons  named as  proxies  to

                                      iii


vote to adjourn the special  meeting,  if necessary or  appropriate,  to solicit
additional  proxies.  See "THE MERGER -  Recommendation  of  LabOne's  Board and
Reasons for the Merger."

     Q:   What vote of shareholders is required to approve the merger agreement?

     A:   Approval  of the merger agreement requires the affirmative vote of the
holders of at least  two-thirds  of the  outstanding  shares of LabOne's  common
stock entitled to vote at the special meeting.

     The proposal to adjourn the special  meeting,  if necessary or appropriate,
to solicit additional proxies requires the affirmative vote of a majority of the
shares represented in person or by proxy at the special meeting entitled to vote
thereon.

     Q: HOW ARE VOTES COUNTED?

     A: For the  proposal  relating to the merger  agreement,  you may vote FOR,
AGAINST or  ABSTAIN.  Abstentions  will not count as votes cast on the  proposal
relating to the adoption of the merger agreement, but will count for the purpose
of determining  whether a quorum is present at the special meeting. As a result,
if you  ABSTAIN,  it has the same effect as if you vote  AGAINST the adoption of
the merger agreement.

     For  the  proposal  to  adjourn  the  special  meeting,   if  necessary  or
appropriate,  to  solicit  additional  proxies,  you may vote  FOR,  AGAINST  or
ABSTAIN. Abstentions will not count as votes cast on the proposal to adjourn the
special meeting, if necessary or appropriate, to solicit additional proxies, but
will  count for the  purpose of  determining  whether a quorum is present at the
special meeting.  As a result, if you ABSTAIN,  it has the same effect as if you
vote AGAINST adjournment of the special meeting, if necessary or appropriate, to
solicit additional proxies.

     If you sign your proxy card without  indicating  your vote, your votes will
be voted "FOR" the adoption of the merger  agreement,  and "FOR"  adjournment of
the special meeting, if necessary or appropriate, to solicit additional proxies.

     A broker  non-vote  generally  occurs when a broker,  bank or other nominee
holding  shares on your behalf  does not vote on a proposal  because the nominee
has not yet received your instructions and lacks discretionary power to vote the
shares.  Broker  non-votes will not count as votes cast on a proposal,  but will
count for  purposes  of  determining  whether a quorum is present at the special
meeting.

     As a result,  broker  non-votes will have the same effect as a vote against
the  adoption  of the merger  agreement.  Broker  non-votes  will not affect the
outcome of the vote on the adjournment of the special  meeting,  if necessary or
appropriate, to solicit additional proxies.

     Q:   WHO IS ENTITLED TO VOTE AT THE SPECIAL MEETING?

     A: Only shareholders of record as of the close of business on ____________,
2005 are  entitled  to receive  notice of the  special  meeting  and to vote the
shares of our common  stock that they held at that time at the special  meeting,
or at any adjournments or postponements of the special meeting.

     Q:   MAY I VOTE IN PERSON?

     A: Yes.  If your shares are not held in "street  name"  through a broker or
bank you may attend the special  meeting and vote your shares in person,  rather
than  signing  and  returning  your  proxy card or voting  via the  Internet  or
telephone.  If your shares are held in "street  name," you must get a proxy from
your  broker or bank in order to  attend  the  special  meeting  and vote  those
shares.

     Q:   MAY I VOTE VIA THE INTERNET OR TELEPHONE?

     A: Yes.  If your shares are not held in "street  name"  through a broker or
bank,  you may submit a proxy  authorizing  the voting of your  shares  over the
Internet at _____________ or telephonically by calling

                                       iv


_______________.  Proxies  submitted  via  the  Internet  or  telephone  must be
received by ___ p.m. local time on _____, 2005. You must have the enclosed proxy
card  available,  and follow the  instructions  on such proxy card,  in order to
submit a proxy via the Internet or telephone.

     Q:   HOW WILL MY PROXY BE VOTED?

     A: If proxies are properly  dated,  executed and returned,  the shares they
represent  will  be  voted  at  the  special  meeting  in  accordance  with  the
instructions of the  shareholder.  If no specific  instructions  are given,  the
shares will be voted as follows:

     o    FOR the approval of the merger agreement;

     o    FOR the  grant of  discretionary  authority  to the  persons  named as
          proxies  to vote to adjourn  the  special  meeting,  if  necessary  or
          appropriate, to solicit additional proxies.

     Q:  WHAT  HAPPENS  IF I DO NOT  RETURN MY PROXY  CARD,  DO NOT VOTE VIA THE
INTERNET OR TELEPHONE AND DO NOT ATTEND THE SPECIAL MEETING AND VOTE IN PERSON?

     A: Approval of the merger  agreement  requires the affirmative  vote of the
holders of at least  two-thirds  of the  outstanding  shares of our common stock
entitled to vote at the special  meeting.  Therefore,  if you do not return your
proxy card, or vote via the Internet or telephone, or attend the special meeting
and vote in person,  or instruct  your broker or bank how to vote your shares if
your  shares are held in "street  name," it will have the same  effect as if you
voted  against the merger.  The  approval of any proposal to adjourn the special
meeting requires the affirmative vote of the holders of a majority of the shares
of our common stock represented in person or by proxy at the special meeting and
entitled to vote thereon.  If you do not vote your shares in person or by proxy,
it will not affect the outcome of the vote on this matter.

      Q:  MAY I CHANGE MY VOTE AFTER I HAVE SUBMITTED MY PROXY?

     A: Yes.  You may  change  your vote at any time  before  your proxy card is
voted at the special  meeting.  If your shares are  registered in your name, you
can do this in one of four ways.

     o    First,  you can deliver to D. F. King & Co.,  Inc.,  a written  notice
          bearing a date later than your previously submitted proxy stating that
          you would like to revoke your proxy.

     o    Second,  you can  complete,  execute  and deliver to D. F. King & Co.,
          Inc., a new, later dated proxy card for the same shares.

     o    Third, you can log onto the Internet  website  specified on your proxy
          card  in  the  same   manner  you  would  do  to  submit   your  proxy
          electronically  or by calling the telephone  number  specified on your
          proxy card (in each case if you are  eligible to do so) and follow the
          instructions on the proxy card.

     o    Fourth,  you can attend the special  meeting and vote in person.  Your
          attendance alone will not revoke your proxy.

     Any written notice of revocation or subsequent proxy should be delivered to
D. F. King & Co.,  Inc. or hand  delivered  to D. F. King & Co.,  Inc.,  48 Wall
Street,  New York,  New York  10005,  at or before the taking of the vote at the
special meeting.  If you have instructed a broker to vote your shares,  you must
follow directions  received from your broker to change those  instructions.  See
"THE SPECIAL MEETING - Proxies."

     Q: IF MY BROKER  HOLDS MY SHARES IN "STREET  NAME,"  WILL MY BROKER VOTE MY
SHARES FOR ME?

                                       v


     A: Your broker will not be able to vote your  shares  without  instructions
from you.  You should  instruct  your broker to vote your shares  following  the
procedure provided by your broker. Without instructions, your shares will not be
voted,  which will have the same effect as if you voted against  approval of the
merger agreement.  Broker non-votes will have no effect on the proposal to grant
the  persons  named as proxies  discretionary  authority  to vote to adjourn the
special meeting, if necessary or appropriate, to solicit additional proxies. See
"THE SPECIAL MEETING - Proxies."

     Q: WHAT SHOULD I DO IF I RECEIVE MORE THAN ONE SET OF VOTING MATERIALS?

     A:  You may  receive  more  than  one set of  voting  materials,  including
multiple  copies of this proxy  statement  and  multiple  proxy  cards or voting
instruction  cards. If you hold your shares in more than one brokerage  account,
you will receive a separate voting  instruction card for each brokerage  account
in which you hold shares. If you are a shareholder of record and your shares are
registered  in more than one name,  you will  receive  more than one proxy card.
Please  complete,  sign,  date and return (or vote via the Internet or telephone
with respect to) each proxy card and voting instruction card that you receive to
ensure that all of your shares are voted.

     Q: WHAT  HAPPENS  IF I SELL MY SHARES OF LABONE  COMMON  STOCK  BEFORE  THE
SPECIAL MEETING?

     A: The record date for the special  meeting is earlier than the date of the
special meeting and the date that the merger is expected to be completed. If you
transfer your shares of LabOne common stock after the record date but before the
special meeting,  you will retain your right to vote at the special meeting, but
will transfer the right to receive the merger consideration.

     Q:  WILL THE MERGER BE TAXABLE TO ME?

     A:  Generally,  yes.  The  receipt  of cash  pursuant  to the  merger  will
generally be a taxable transaction for U.S. federal income tax purposes, and may
also be a taxable transaction under applicable state, local or foreign income or
other tax laws.  Generally,  for U.S. federal income tax purposes, a shareholder
will recognize  gain or loss equal to the difference  between the amount of cash
received by the shareholder in the merger and the  shareholder's  adjusted basis
in the shares of LabOne common stock  converted into cash in the merger.  If the
shares of LabOne common stock are held by a shareholder as capital assets,  gain
or loss recognized by such  shareholder will be capital gain or loss, which will
be long term capital gain or loss if the  shareholder's  holding  period for the
shares of LabOne common stock exceeds one year. Because individual circumstances
may differ,  you should consult your own tax advisor to determine the particular
tax  effects  to you.  See  "THE  MERGER  -  Certain  U.S.  Federal  Income  Tax
Consequences."

     Q:   AM I ENTITLED TO DISSENTERS' RIGHTS?

     A: Yes. As a holder of LabOne common stock, you are entitled to dissenters'
rights under the General and Business  Corporation Law of Missouri in connection
with the merger if you meet certain  conditions.  These conditions are described
in this proxy statement under the caption "THE MERGER - Dissenters' Rights."

     Q:   SHOULD I SEND IN MY LABONE STOCK CERTIFICATES NOW?

     A:  No. Shortly  after the merger is  completed,  you will receive  written
instructions  for  exchanging  your  shares of our  common  stock for the merger
consideration. If your shares are held in "street name" by your broker, you will
receive  instructions from your broker as to how to effect the surrender of your
"street name" shares and receive the merger  consideration  for those shares. DO
NOT SEND ANY STOCK CERTIFICATES WITH YOUR PROXY.

     Q:   WHO CAN HELP ANSWER MY QUESTIONS?

     A: If you would  like  additional  copies,  without  charge,  of this proxy
statement  or if you  have  more  questions  about  the  merger,  including  the
procedures for voting your shares, you should contact:

                                       vi




                D. F. King & Co., Inc. 
                48 Wall Street 
                New York, New York 10005
                (212) 269-5550 - Banks and Brokers (collect calls)
                (888) 567-1626 - All others (toll-free)




                                      vii



                               SUMMARY TERM SHEET

     This summary highlights selected  information from this proxy statement and
may not contain all of the information  that may be important to you. For a more
complete  understanding  of the merger and  related  transactions  and the other
information  contained in this proxy  statement,  you should read carefully this
entire proxy statement and the appendices to this proxy statement. A copy of the
Agreement  and Plan of Merger,  dated as of August 8, 2005,  by and among  Quest
Diagnostics,  Fountain  and  LabOne is  attached  as  Appendix  A to this  proxy
statement.  For  instructions on obtaining more  information  concerning us, see
"WHERE YOU CAN FIND MORE INFORMATION" on page 38.

The Companies

        LabOne, Inc. (see page   )
        LabOne, Inc.
        10101 Renner Boulevard
        Lenexa, Kansas 66219
        Telephone:  (913) 888-1770

Headquartered  in the Greater  Kansas City area,  we are a  diagnostic  services
provider.  The  services and  information  we provide  include  risk  assessment
information services for the insurance industry;  diagnostic  healthcare testing
to physicians,  hospitals,  managed care  organizations and employers;  and drug
testing  services and related employee  qualification  products to employers and
the government.

        Quest Diagnostics Incorporated and Fountain, Inc. (see page )
        Quest Diagnostics Incorporated
        1290 Wall Street
        West Lyndhurst, New Jersey 07071
        Telephone: (210) 393-5000

Quest Diagnostics is a provider of diagnostic testing,  information and services
through its  nation-wide  network of laboratories  and patient service  centers.
Quest Diagnostics  provides  interpretive  consultation  through its medical and
scientific  staff.  Quest  Diagnostics  is also a provider of esoteric  testing,
including  gene-based  testing  and  testing  for drugs of abuse,  and  anatomic
pathology services and testing for clinical trials.

Fountain,  a wholly-owned  subsidiary of Quest Diagnostics,  was organized under
the laws of  Missouri  solely  for the  purpose  of  entering  into  the  merger
agreement  with us and  completing the merger and has not conducted any business
operations.



                                      viii



The Special Meeting

     General (see page   )

     This  proxy  statement  is  furnished  to our  shareholders  for use at the
     special  meeting of  shareholders  called to consider and vote upon (1) the
     proposal  to approve  the merger  agreement  and (2) upon any  proposal  to
     adjourn  the special  meeting,  if  necessary  or  appropriate,  to solicit
     additional  proxies  in the event that  there are not  sufficient  votes to
     approve the merger  agreement.  The special  meeting will be held at ______
     a.m. local time on ___________, 2005 at our corporate headquarters at 10101
     Renner Boulevard,  Lenexa, Kansas 66219. 

     Record Date and Quorum Requirement (see page )

     We have set the close of business on  ___________,  2005 as the record date
     for  determining  those  shareholders  who are entitled to notice of and to
     vote at the special meeting.  There were _______ shares of our common stock
     outstanding at the close of business on that date.

     A majority of the shares of our common  stock  issued and  outstanding  and
     entitled  to vote at the  special  meeting  must be  present  in  person or
     represented by proxy to constitute a quorum for transacting business at the
     special  meeting.

     Vote Required (see page )

     The approval of the merger  agreement  requires the affirmative vote of the
     holders  of at least  two-thirds  of the  outstanding  shares of our common
     stock  entitled to vote at the special  meeting.  If you do not return your
     proxy card,  or vote via the Internet or  telephone,  or attend the special
     meeting  and vote in person,  or  instruct  your broker or bank how to vote
     your shares if your shares are held in "street name", it will have the same
     effect as if you voted against the merger agreement.

     The  approval of any proposal to adjourn the special  meeting  requires the
     affirmative  vote of the  holders of a majority of the shares of our common
     stock represented in person or by proxy at the special meeting and entitled
     to vote  thereon.  If you do not vote your  shares,  it will not affect the
     outcome of the vote on this matter.


                                       ix




The Merger

     The Merger (see page )

     The merger agreement  provides for the acquisition by Quest  Diagnostics of
     us through the merger of its wholly-owned  subsidiary,  Fountain,  with and
     into us. After the merger,  LabOne will be the  surviving  corporation  and
     Quest Diagnostics will own all of our common stock.

     What You Will Receive in the Merger (see page )

     Unless you seek dissenters'  rights, you will be entitled to receive $43.90
     in cash,  without  interest and subject to applicable tax  withholding,  in
     exchange  for each  share of our  common  stock  you own at the time of the
     merger.

     Expected Time for Completing the Merger (see page )

     We are working to complete the merger as soon as  practicable,  but we must
     first satisfy the  conditions to the  completion of the merger set forth in
     the merger  agreement.  We  presently  expect to complete the merger in the
     fourth quarter of 2005.  However,  we cannot provide you absolute assurance
     of when or if the merger will occur.

     The Board of Directors  Recommends  That You Vote For the Merger  Agreement
     (see page )

     After  careful  consideration,  our  board  of  directors  has  unanimously
     approved the merger  agreement and has determined that the merger agreement
     and  merger  are  advisable  and  in  the  best  interests  of us  and  our
     shareholders.  Our directors  unanimously recommend that you vote "FOR" the
     approval  of the merger  agreement  and "FOR" the  approval  to adjourn the
     special meeting, if necessary or appropriate, to solicit additional proxies
     if there are not sufficient  votes for approval of the merger  agreement at
     the special meeting.

     Reasons for the Merger (see page )

     Our board of  directors  considered  a number of  factors in  reaching  its
     determination   to  approve  the  merger   agreement.   See  "THE  MERGER--
     Recommendation of LabOne's Board and Reasons for the Merger".



                                       x


     Opinion of Financial Advisor (see page )

     In connection  with the merger,  we retained J.P.  Morgan  Securities  Inc.
     (referred to herein as JPMorgan),  as our financial advisor. In deciding to
     approve the merger,  our board of directors  considered the oral opinion of
     JPMorgan provided to the board of directors on August 5, 2005 (subsequently
     confirmed in writing on August 6, 2005) that, as of the date of the opinion
     and based upon and subject to the  considerations  described in its opinion
     and such other matters as JPMorgan considered  relevant,  the consideration
     to be received by the holders of common  stock in the  proposed  merger was
     fair, from a financial point of view, to such holders.

     The full text of the written opinion of JPMorgan,  which sets forth,  among
     other things, the assumptions made, procedures followed, matters considered
     and  limitations  on the scope of the  review  undertaken  by  JPMorgan  in
     connection  with the  opinion,  is  attached  to this  proxy  statement  as
     Appendix  B and  incorporated  in  this  document  by  reference.  JPMorgan
     provided its opinion for the  information  and  assistance  of our board of
     directors  in  connection  with  its   consideration   of  the  transaction
     contemplated  by  the  merger  agreement.  The  JPMorgan  opinion  is not a
     recommendation  as to how any  holder  of  common  stock  should  vote with
     respect to the  merger or any other  matter.  Pursuant  to the terms of our
     engagement letter with JPMorgan,  we agreed to pay the fees described below
     under "THE MERGER -- Opinion of LabOne's Financial Advisor",  part of which
     was due to JPMorgan upon delivery of JPMorgan's  opinion and the balance of
     which is due upon  closing of the  transaction  contemplated  by the merger
     agreement.

     Interests of Our Directors and Executive Officers in the Merger (see page )

     When considering the  recommendation  by our board of directors in favor of
     the merger,  you should be aware that our directors and executive  officers
     have  interests in the merger that are  different  from, or in addition to,
     your interests, including the following:

          o    our  directors and  executive  officers will have their  unvested
               stock  options  accelerated  and their vested and unvested  stock
               options "cashed out" in connection with the merger,  meaning that
               they will receive cash payments for each share  underlying  their
               options equal to the excess of $43.90 per share over the exercise
               price  per  share  of  their  options,  subject  to any  required
               withholding for taxes;

          o    two of our executive  officers will be entitled to cash severance
               payments  under certain  change of control  severance  agreements
               upon the effective time of the merger;

          o    five of our executive  officers have entered into new  employment
               arrangements   with  the   surviving   corporation   subject   to
               consummation of the merger; and

          o    certain  indemnification and liability insurance arrangements for
               our current and former  directors  and officers will be continued
               for six years  following the effective  time of the merger if the
               merger is completed.

     Our board of directors was aware of these  interests and  considered  them,
     among other matters,  in making its  recommendation  to our shareholders to
     approve the merger agreement.



                                       xi


     Market Prices and Dividends (see page )

     The closing  price of a share of our common stock on August 5, 2005,  which
     was the trading day  immediately  preceding  our  announcement  that we had
     entered into the merger agreement, was $37.64 per share.

     We did not pay dividends on our common stock during 2005, 2004 or 2003.

     Treatment of Outstanding Stock Options (see page )

     At the effective  time of the merger,  each  outstanding  stock option will
     become fully vested and exercisable. All stock options will be cancelled at
     the  effective  time of the  merger.  The holder of each stock  option will
     generally  be entitled to receive,  in full  satisfaction  of the rights of
     such holder  with  respect to such stock  option,  an amount for each share
     subject to the stock option equal to the excess of the merger consideration
     of $43.90 per share over the exercise price per share, less any withholding
     taxes.  Holders of options  pursuant to our 2001  Long-Term  Incentive Plan
     will be  required  to complete a notice of exercise in order to receive the
     cash payable at the effective time of the merger.  All amounts payable will
     be paid at or as soon as  practicable  following the effective  time of the
     merger, without interest and subject to applicable tax withholding.

     Conditions to the Closing of the Merger (see page )

     Quest Diagnostics', Fountain's and our respective obligations to consummate
     the merger are subject to the satisfaction of the following conditions:

          o    approval  of  the  merger   agreement   and  the  merger  by  our
               shareholders;

          o    the  expiration or  termination  of the waiting  period under the
               Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended,
               which we refer to as the HSR Act; and

          o    the absence of any law,  rule,  injunction,  judgment,  decree or
               order prohibiting the merger.

     In  addition,  we are not  obligated  to effect the merger  unless  certain
     conditions  have  been  satisfied  or  waived  in  writing,  including  the
     following:

          o    the  representations  and  warranties  of Quest  Diagnostics  and
               Fountain set forth in the merger  agreement that are qualified as
               to materiality  must be true and correct,  and those that are not
               so qualified  must be true and correct in all material  respects,
               in each case as of the date of the merger agreement and as of the
               effective  time  of  the  merger  (except   representations   and
               warranties  that by their terms  speak as of a  specified  date);
               except where any failure of such  representations  and warranties
               to be true and correct,  individually or in the aggregate,  would
               not prohibit or materially  delay the  consummation of the merger
               or prevent Quest  Diagnostics or Fountain from  performing  their
               obligations under the merger agreement;

          o    Quest  Diagnostics'  and Fountain's  representation  and warranty
               that  Quest  Diagnostics  will  have  sufficient  funds as of the
               effective  time of the merger to consummate the merger and to pay
               the  merger   consideration  and  amounts  required  to  cash-out
               outstanding  stock  options  must be true and  correct  as of the
               effective  time  of  the  merger;  and



                                       xii


          o    Quest Diagnostics and Fountain must have complied in all material
               respects  with all of their  covenants and  agreements  under the
               merger  agreement to be complied with prior to the effective time
               of the merger.

     In addition,  Quest  Diagnostics and Fountain are not obligated to complete
     the merger unless  certain  conditions  are satisfied or waived in writing,
     including the following:

          o    the  representations and warranties by us set forth in the merger
               agreement  that  are  qualified  as to  materiality  or  material
               adverse  effect must be true and correct,  and those that are not
               so qualified  must be true and correct in all material  respects,
               in each case as of the date of the merger agreement and as of the
               effective  time  of  the  merger  (except   representations   and
               warranties  that by their terms  speak as of a  specified  date);
               except where any failure of such  representations  and warranties
               to be true and correct,  either individually or in the aggregate,
               would not have a material adverse effect;

          o    we must have  complied in all material  respects  with all of our
               covenants  and  agreements  under  the  merger  agreement  to  be
               complied with prior to the effective time of the merger; and

          o    a demand for fair value of dissenting  shares of our common stock
               must not have been  perfected,  asserted or demanded with respect
               to more  than  10% of the  aggregate  number  of our  outstanding
               shares of common stock.

     No Solicitation by Us (see page )

     The merger  agreement  contains  restrictions  on our ability to solicit or
     engage in  discussions  or  negotiations  with a third party  regarding  an
     acquisition  proposal.  Notwithstanding  these restrictions,  under certain
     limited circumstances, our board of directors may respond to an unsolicited
     written  bona  fide  acquisition  proposal  and may  terminate  the  merger
     agreement and enter into a definitive  agreement with respect to a superior
     proposal.

     Termination of the Merger Agreement (see page )

     Quest  Diagnostics and we can terminate the merger  agreement under certain
     circumstances,  even after the  shareholders  of LabOne have  approved  the
     merger agreement, including:

          o    by mutual written consent of Quest Diagnostics and us;

          o    if the merger has not been completed by April 7, 2006, which date
               may be extended to August 8, 2006 under certain circumstances, by
               Quest Diagnostics,  as long as the failure to complete the merger
               was not caused by the failure of Quest Diagnostics to fulfill any
               obligation under the merger  agreement,  or by us, as long as the
               failure to  complete  the merger was not caused by the failure of
               the Company to fulfill any obligation under the merger agreement;

          o    by either  Quest  Diagnostics  or us if there is any law or order
               prohibiting  completion of the merger,  and such order shall have
               become final and nonappealable;



                                      xiii


          o    by Quest  Diagnostics,  in the  event of any  breach by us of any
               representation,   warranty  or  covenant  that  would  cause  any
               condition to Quest Diagnostics' obligation to complete the merger
               to not be satisfied, which breach is not cured in accordance with
               the merger agreement;

          o    by us,  in the  event  of any  breach  by  Quest  Diagnostics  or
               Fountain of any  representation,  warranty or covenant that would
               cause any  condition to our  obligation to complete the merger to
               not be satisfied,  which breach is not cured in  accordance  with
               the merger agreement;

          o    by Quest  Diagnostics  if,  at any time  prior to the date of the
               special meeting, our board of directors shall have (i) effected a
               change in the company recommendation regarding the merger or (ii)
               approved or recommended, or proposed to approve or recommend, any
               competing transaction;

          o    by Quest  Diagnostics  or us if, upon a vote taken at the special
               meeting  or  any  postponement  or  adjournment  of  the  special
               meeting,  the merger  agreement is not approved by the holders of
               at least two-thirds of the outstanding shares of our common stock
               entitled to vote thereon; or

          o    by us, at any time prior to obtaining shareholder approval of the
               merger agreement,  in order to enter into a definitive  agreement
               with respect to a superior proposal in accordance with the merger
               agreement.


     Termination Fees and Expenses (see page )

     The merger agreement requires that we pay Quest Diagnostics a $26.5 million
     termination fee if:

          1.   (a) Quest Diagnostics terminates the merger agreement because our
               board of directors effects a change in the company recommendation
               regarding  the merger  prior to the date of the special  meeting,
               and

               (b) we enter into a definitive agreement, within 12  months after
               such termination, relating to a competing  transaction  and  such
               transaction is thereafter consummated; or

          2.   (a)  Quest  Diagnostics  or we  terminate  the  merger  agreement
               because,  upon  a  vote  taken  at  the  special  meeting  or any
               postponement  or adjournment of the special  meeting,  the merger
               agreement is not  approved by the holders of at least  two-thirds
               of the  outstanding  shares of our common stock  entitled to vote
               thereon,  



                                       xiv


               (b)  prior  to  the  vote  by  our  shareholders  on  the  merger
               agreement,  a competing transaction is publicly announced and not
               withdrawn,  or otherwise becomes publicly known after the date of
               the merger agreement, and

               (c) we enter into a definitive agreement, within 12  months after
               such termination, relating to a competing  transaction  and  such
               transaction is thereafter consummated; or

          3.   we  terminate  the  merger  agreement  in order  to enter  into a
               definitive  agreement  with  respect  to a superior  proposal  in
               accordance with the merger agreement; or

          4.   Quest  Diagnostics  terminates the merger agreement because prior
               to the date of the special  meeting our board of directors  shall
               have  approved  or   recommended,   or  proposed  to  approve  or
               recommend, any competing transaction.

The merger  agreement  also requires  that we reimburse  Quest  Diagnostics  for
reasonable  out-of-pocket  expenses,  up to a maximum of $3.5  million,  if: (a)
Quest  Diagnostics  terminates the merger agreement as a result of any breach by
us of any  representation,  warranty or covenant  in the merger  agreement  that
would cause any  condition  to Quest  Diagnostics'  obligation  to complete  the
merger to not be  satisfied,  which breach is not cured in  accordance  with the
merger  agreement;  or (b) Quest  Diagnostics  terminates  the merger  agreement
because  our board of  directors  shall have  effected  a change in the  company
recommendation regarding the merger prior to the date of the special meeting.

The  termination  fee  payable  pursuant  to Item 1 above will be reduced by the
amount of any  expenses of Quest  Diagnostics  required to be  reimbursed  by us
under the merger agreement.

Regulatory Approvals (see page   )

Completion of the merger is subject to expiration or  termination of the waiting
period under the HSR Act. The merger cannot proceed in the absence of expiration
or early  termination of the waiting period.  LabOne and Quest Diagnostics filed
notification  and  report  forms  under  the  HSR Act  with  the  Federal  Trade
Commission,  which we refer to as the FTC,  and the  Antitrust  Division  of the
Department of Justice on August 19, 2005. At any time before or after completion
of the  merger,  notwithstanding  the  expiration  or early  termination  of the
waiting  period under the HSR Act, the Antitrust  Division or the FTC could take
such action under the antitrust  laws as it deems  necessary or desirable in the
public  interest,  including  seeking to enjoin the  completion of the merger or
seeking  divestiture  of  substantial  assets  of us or Quest  Diagnostics.  The
consummation  of the merger is subject  to the  condition  that there be no law,
rule, injunction, judgment, decree or order prohibiting the merger.

Except as noted above with respect to the required filings under the HSR Act and
the filing of articles of merger in Missouri at or before the effective  date of
the merger, we are unaware of any material, federal, state or foreign regulatory
requirements or approvals  required for the execution of the merger agreement or
completion of the merger.



                                       xv


Certain U.S. Federal Income Tax Consequences (see page   )

The receipt of cash by U.S.  holders in exchange  for shares of our common stock
in the merger will generally be a taxable  transaction  for U.S.  federal income
tax  purposes  and may also be a taxable  transaction  under  applicable  state,
local,  foreign  or other tax laws.  Generally,  this  means you will  recognize
taxable gain or loss equal to the difference,  if any,  between (1) the cash you
receive in the merger and (2) your  adjusted tax basis in your shares.  See "THE
MERGER - Certain  Material  U.S.  Federal  Income Tax  Consequences"  for a more
detailed  discussion of certain material U.S. federal income tax consequences of
the merger.  Tax matters are very  complicated  and the tax  consequences of the
merger to you depend on the facts of your own situation. You should consult your
own  tax  advisor  for a full  understanding  of  the  tax  consequences  of the
transaction to you.

Dissenters' Rights (see page )

Shareholders  of record are entitled to exercise  dissenters'  rights if they do
not vote in favor of the merger agreement and if they comply with the procedures
set forth in Section  351.455 of the General  and  Business  Corporation  Law of
Missouri, which we refer to as the MGBCL. A copy of Section 351.455 of the MGBCL
is attached to this proxy statement as Appendix C.

Employee Benefits (see page )

Under the merger  agreement,  Quest Diagnostics has agreed that, for a period of
one  year  after  the  effective  time of the  merger,  it will  honor  (without
modification in a manner adverse to the participants therein) all of our and our
subsidiaries' existing employee contracts, agreements,  arrangements,  policies,
plans and commitments,  excluding any requirement that  contributions be paid in
employer stock;  provided that Quest Diagnostics may transfer some or all of our
and our subsidiaries'  employees to the applicable employee benefit arrangements
of Quest Diagnostics and its subsidiaries during the one-year period, as long as
the employees who are transferred  receive benefits under the arrangements  that
are not  less  favorable  than  the  benefits  provided  to  similarly  situated
employees of Quest Diagnostics and its subsidiaries.

Where to Find More Information (see page )

If you have more questions about the merger or would like  additional  copies of
this proxy statement, you should contact:

                  D. F. King & Co., Inc.
                  48 Wall Street
                  New York, New York 10005
                  (212) 269-5550 - Banks and Brokers (collect calls)
                  (888) 567-1626 - All others (toll-free)


                                      xvi


            CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

     The Securities  and Exchange  Commission  encourages  companies to disclose
forward-looking  information so that investors can better understand a company's
future prospects and make informed investment decisions.

     This proxy statement, and the documents to which we refer you in this proxy
statement, may include forward-looking  statements within the meaning of Section
21E of the Securities  Exchange Act of 1934, as amended.  All  statements  other
than  statements  of  historical  fact  may  be  deemed  to  be  forward-looking
statements.  Examples of forward-looking statements include, but are not limited
to: (i)  projections  of revenues,  income or loss,  earnings or loss per share,
capital expenditures, the payment or non-payment of dividends, capital structure
and other  financial  items,  (ii)  statements  of plans and  objectives  of our
management or board of directors,  including plans or objectives relating to our
products or services, (iii) statements of future economic performance,  and (iv)
statements of assumptions  underlying the statements  described in (i), (ii) and
(iii).  Forward-looking  statements  can  often  be  identified  by  the  use of
forward-looking   terminology,   such  as  "anticipate,"  "estimate,"  "expect,"
"project,"  "intend,"  "plan,"  "believe,"  "target,"  "objective,"  "strategy,"
"goal" and words and terms of similar substance. Our forward-looking  statements
are based on management's current views about future events and are subject to a
number of factors and  uncertainties  that could cause actual  results to differ
materially from those described in the forward-looking statements.

     Forward-looking  statements  should  not be read as a  guarantee  of future
performance or results,  and will not necessarily be accurate indications of the
times at which,  or by which,  such  performance  or results  will be  achieved.
Forward-looking information is based on information available at the time and/or
management's good faith belief with respect to future events,  and is subject to
risks and  uncertainties  that could cause our actual  performance or results to
differ materially from those expressed in the statements. Important factors that
could cause such  differences  include,  but are not limited to:  whether we are
able to complete  the merger;  effects of the  announcement  and pendency of the
merger on our  business;  whether we are fully  successful in  implementing  our
financial  and  operational  initiatives;   industry  competition,   conditions,
performance and consolidation;  legislative and/or regulatory developments;  the
effects  of adverse  general  economic  conditions,  both  within  the U.S.  and
globally;  any adverse  economic or  operational  repercussions  from  terrorist
activities, any government response thereto and any future terrorist activities,
war or other armed  conflicts;  changes in fuel prices;  changes in labor costs;
labor  stoppages;  the outcome of claims and litigation;  natural events such as
severe  weather,  floods and  earthquakes;  and other  factors  described in our
filings with the Securities and Exchange Commission.

     We  caution  you  not  to  place  undue  reliance  on  our  forward-looking
statements,  which speak only as of the date of this proxy statement.  Except as
required  by law,  we are  under  no  obligation,  and  expressly  disclaim  any
obligation, to update or alter any forward-looking statements made in this proxy
statement or elsewhere, whether as a result of new information, future events or
otherwise.

     For additional information about factors that could cause actual results to
differ materially from those described in the forward-looking statements, please
see the  filings  and  reports  that we make with the  Securities  and  Exchange
Commission as described under "Where You Can Find More Information."


                                       1



                                  THE COMPANIES

LabOne, Inc.

     Headquartered in the Greater Kansas City area, we are a diagnostic services
provider.  We provide:  risk assessment  information  services for the insurance
industry;  diagnostic healthcare testing to physicians,  hospitals, managed care
organizations  and  employers;  and drug testing  services and related  employee
qualification products to employers and the government.  Our principal executive
offices are located at 10101 Renner  Boulevard,  Lenexa,  Kansas 66219,  and our
telephone number is (913) 888-1770.

Quest Diagnostics Incorporated and Fountain, Inc.

     Quest  Diagnostics  is a provider of diagnostic  testing,  information  and
services  through its nation-wide  network of  laboratories  and patient service
centers.  Quest  Diagnostics also is a provider of esoteric  testing,  including
gene-based  testing  and  testing  for drugs of abuse,  and  anatomic  pathology
services and testing for clinical trials. Quest Diagnostics' principal executive
offices are located at 1290 Wall Street West,  Lyndhurst,  New Jersey 07071, and
its telephone number is (201) 393-5000.

     Fountain,  a wholly-owned  subsidiary of Quest  Diagnostics,  was organized
under the laws of Missouri  solely for the  purpose of entering  into the merger
agreement  with us and  completing the merger and has not conducted any business
operations.


                               THE SPECIAL MEETING

Date, Time and Place of the Special Meeting

     This proxy  statement is being furnished to shareholders in connection with
the  solicitation  of proxies by our board of  directors  for use at the special
meeting  of  shareholders  to be held  on  ____________,  2005 at our  corporate
headquarters at 10101 Renner Boulevard,  Lenexa,  Kansas 66219, at ______, local
time, and at any adjournments or postponements thereof.

     This proxy  statement  and the  accompanying  form of proxy are first being
mailed by us to our shareholders on or about ____________, 2005.

Matters to Be Considered at the Special Meeting

     At the  special  meeting,  our  shareholders  will be  asked to vote on the
following proposals:

          o    to approve the merger agreement,

          o    to approve  any  proposal  to adjourn  the  special  meeting,  if
               necessary or appropriate,  to solicit  additional  proxies in the
               event  that  there  are  insufficient  votes  at the  time of the
               special meeting to approve the merger agreement, and

          o    to conduct any other  business  that  properly  comes  before the
               special  meeting  or any  adjournments  or  postponements  of the
               special meeting.

Record Date for the Special Meeting

     Our board of  directors  has fixed the close of business on  _________  __,
2005 as the record date for determination of the shareholders entitled to notice
of, and to vote at, the special  meeting.  On the record date, there



                                       2


were ______ shares of our common stock outstanding, held by approximately ______
holders of record. At the special meeting,  each holder of our common stock will
have one vote for each share of our common stock held.

Quorum

     If a majority of the shares of our common stock issued and  outstanding and
entitled to vote at the special  meeting is  represented  either in person or by
proxy at the special  meeting,  a quorum will be present at the special meeting.
Shares  represented in person or by proxy and for which the holder has abstained
from voting will be counted as present at the  special  meeting for  purposes of
determining the presence or absence of a quorum.

     A broker who holds shares in nominee or "street name" for a customer who is
the beneficial  owner of those shares is prohibited  from giving a proxy to vote
those  shares on the  matters to be  considered  and voted  upon at the  special
meeting without  specific  instructions  from such customer with respect to such
matters.  These so-called  "broker  non-votes" will be counted as present at the
special meeting for purposes of determining whether a quorum exists.

Votes Required for Approval

     Approval  of the merger  agreement  requires  the  affirmative  vote of the
holders of at least  two-thirds  of the  outstanding  shares of our common stock
entitled to vote at the special  meeting.  Abstentions and broker non-votes will
have the same  effect as votes  against  the  proposal  to  approve  the  merger
agreement.

     Approval  of any  proposal  to adjourn the  special  meeting  requires  the
affirmative  vote of the holders of a majority of the shares of our common stock
represented in person or by proxy at the special meeting and entitled to vote on
the proposal. Abstentions on this matter will have the effect of negative votes.
Broker  non-votes will not affect the outcome of the vote on this matter because
these  votes  will  not be  considered  present  and  entitled  to vote for this
purpose.

Recommendation of the Board of Directors

     Our directors  unanimously  recommend  that you vote "FOR"  approval of the
merger agreement.

     Our directors  unanimously  recommend  that you vote "FOR"  approval of the
grant of  discretionary  authority  to the  persons  named as proxies to vote to
adjourn the special meeting, if necessary or appropriate,  to solicit additional
proxies.

Proxies

     All shares of our common stock  represented  by properly  executed  proxies
received  before or at the special  meeting will,  unless  revoked,  be voted in
accordance with the instructions indicated on those proxies. If you execute your
proxy but make no specification,  your proxy will be voted "FOR" approval of the
merger agreement and "FOR" approval of the grant of  discretionary  authority to
the  persons  named as  proxies  to vote to  adjourn  the  special  meeting,  if
necessary  or  appropriate,  to  solicit  additional  proxies.  You are urged to
complete and sign the proxy card enclosed with this proxy  statement and mail it
promptly in the enclosed postage prepaid  envelope,  or to vote via the Internet
or telephone.  If you do not return your proxy card, or vote via the Internet or
telephone,  or attend the special  meeting and vote in person,  or instruct your
broker or bank how to vote your shares if your shares are held in "street name",
it will have the same effect as if you voted against the merger agreement.



                                       3


     We do not expect that any other matters will be brought  before the special
meeting. If, however, other matters are properly presented, the persons named as
proxies  will vote the  shares  represented  by  properly  executed  proxies  in
accordance with their judgment with respect to those matters.

     If you are a holder of record, you may revoke your proxy at any time before
it is voted by:

          o    delivering to D. F. King & Co., Inc. a written  notice  bearing a
               date later than the proxy  stating  that you would like to revoke
               your proxy;

          o    completing,  executing and delivering to D. F. King & Co., Inc. a
               new, later dated proxy card for the same shares;

          o    logging onto the Internet website specified on your proxy card in
               the same manner you would do to submit your proxy  electronically
               or by calling the telephone  number  specified on your proxy card
               (in each case if you are  eligible  to do so) and  following  the
               instructions on the proxy card; or

          o    attending  the  special  meeting  and  voting  in  person.   Your
               attendance alone will not revoke your proxy.

     If your shares are held by a bank,  broker or other nominee,  you will need
to contact such third party for instructions to revoke your proxy.

     Shareholders who do not vote in favor of the proposal to approve the merger
agreement and who otherwise comply with applicable  statutory  procedures of the
MGBCL  summarized  elsewhere  in this proxy  statement  will be entitled to seek
appraisal of the fair value of their common stock under  Section  351.455 of the
MGBCL. See "THE MERGER -- Dissenters' Rights."

Solicitation of Proxies

     We will bear the cost of soliciting  proxies for the special meeting and of
printing and mailing this proxy statement.  In addition to solicitation by mail,
our directors,  officers and other employees,  without additional  compensation,
may  solicit  proxies in person,  or by  telephone,  telecopy  or other means of
electronic communication. We will request brokerage houses and other custodians,
nominees and fiduciaries to send the proxy materials to beneficial  owners,  and
we will, upon written  request,  reimburse those brokerage houses and custodians
for  their  reasonable  expenses  in so  doing.  We  urge  shareholders  to mail
completed  proxies  without  delay or vote via the  Internet  or  telephone,  as
specified on the proxy card.

     We have retained D. F. King & Co.,  Inc., a proxy  solicitation  firm,  for
assistance  in  connection  with the  solicitation  of proxies  for the  special
meeting at an  anticipated  cost not to exceed  $7,500,  plus  reimbursement  of
reasonable  out-of-pocket  expenses  for such items as mailing,  copying,  phone
calls,  faxes and other related items. In addition,  we have agreed to indemnify
D. F. King & Co.,  Inc.  against any losses  arising  out of that  firm's  proxy
soliciting services on our behalf.

Stock Certificates

     Please do not send your common  stock  certificates  with your proxy cards.
Promptly  after the merger is  completed,  the paying  agent for the merger will
send a transmittal  letter to you with  instructions for surrendering your stock
certificates in exchange for the $43.90 per share cash payment, without interest
and subject to applicable tax withholding.


                                       4



                                   THE MERGER

     The  discussion  under the sections of this proxy  statement  entitled "The
Merger" and "The Merger Agreement"  summarizes certain terms of the merger. This
summary  may not  contain  all the  information  that is  important  to you.  We
strongly encourage you to read carefully the merger agreement in its entirety, a
copy of which is attached as Appendix A to this proxy statement.

Background of the Merger

     On February 28, 2005, W. Thomas Grant II, our Chairman, President and Chief
Executive  Officer,  was contacted by Surya N. Mohapatra,  Ph.D.,  the Chairman,
President and Chief Executive Officer of Quest Diagnostics.  Dr. Mohapatra asked
to meet with Mr. Grant when they both would be attending  professional  meetings
in New York. At a dinner meeting on March 15, 2005, Dr.  Mohapatra  informed Mr.
Grant that Quest  Diagnostics  was  potentially  interested  in acquiring us and
requested the  opportunity  to conduct due diligence to determine  whether Quest
Diagnostics  would be  interested  in pursuing  such a  transaction.  Mr.  Grant
responded  that we were not seeking a sale,  but that he would  consult with his
management  team  regarding the  indication of interest.  Mr. Grant informed Dr.
Mohapatra  later by telephone  that a written  indication of interest from Quest
Diagnostics  stating a potential price range and the form of consideration would
be needed prior to taking Quest Diagnostics' request to our board of directors.

     Quest  Diagnostics  provided  to us a written,  non-binding  indication  of
interest dated March 24, 2005  indicating its preliminary  interest,  subject to
various  conditions,  in acquiring  all of our  outstanding  stock for cash at a
price in the range of $40 - $42 per share, and requesting an exclusivity  period
for a limited  duration in order to conduct due diligence.  After  receiving the
indication  of interest,  Mr. Grant  discussed  the  indication of interest with
members  of  management  and our  outside  counsel  and  individually  with  our
directors.  Based  upon these  discussions,  Mr.  Grant  called a meeting of the
executive  committee  of the  board  of  directors  to  discuss  procedures  for
responding  to the  indication of interest,  including  retention of a financial
adviser  and the timing of a meeting of the full  board of  directors.  Based on
these  discussions,  management  determined  to consider  retaining  JPMorgan as
financial  adviser,  based upon  JPMorgan's  experience  in the industry and the
existing  relationship between us and an affiliate of JPMorgan as lead lender on
our existing  senior  credit  facility.  Thereafter,  we  contacted  JPMorgan to
determine what the terms of their engagement would be if we retained them.

     On March 25,  2005,  a meeting of the  executive  committee of the board of
directors  was held in Kansas  City,  Missouri.  At the meeting,  the  executive
committee determined that a meeting of the full board should be held promptly to
consider  the  indication  of interest  and  authorized  our  officers to retain
JPMorgan to act as financial  adviser to the board in evaluating  the indication
of interest from Quest Diagnostics.

     On March 31, 2005, a special  meeting of the board of directors was held in
Kansas  City,  Missouri.  At  that  meeting,  (a)  members  of  management  made
presentations  to the  board  regarding  our  business  segments  and  financial
performance,  (b)  representatives  of JPMorgan made a  presentation  regarding,
among other  things,  various  financial  analyses of us and Quest  Diagnostics'
indication of interest,  and (c) our outside  legal  counsel,  Stinson  Morrison
Hecker LLP, gave an oral  presentation  describing  the fiduciary  duties of the
directors in responding to an acquisition proposal and other matters relating to
a possible sale transaction. The directors discussed whether we should engage in
discussions  with Quest  Diagnostics  concerning  a possible  sale  transaction,
actively  solicit third parties with respect to a possible sale  transaction  or
continue to pursue our long-term strategy as an independent  company.  The board
also discussed possible negotiating  strategies designed to improve the proposed
offering price.  Prior to making any  determinations,  the directors  decided to
meet  again on  April 5,  2005,  following  the  receipt  of  further  requested
information  and  analysis  from  management  and from  the  outside  legal  and
financial advisers. The next day, Stinson Morrison Hecker LLP distributed to the
directors a detailed memorandum describing the fiduciary duties of the directors
in  responding  to an  acquisition  proposal  and other  matters  relating  to a
possible sale transaction.



                                        5


     On April 5, 2005, a special  meeting of our board of directors  was held in
Overland Park, Kansas. After presentations  regarding our business by members of
management, the directors continued their discussion of our possible response to
the indication of interest by Quest Diagnostics.  The directors  determined that
public  disclosure  of a  potential  sale  transaction  without a high degree of
confidence that it would be consummated  would not be in our best interests.  In
addition,  Quest  Diagnostics  had  conditioned  its willingness to proceed with
negotiations  on  maintaining  the  confidentiality  of those  negotiations  and
entering into an exclusivity  agreement for a limited period.  Accordingly,  the
directors  determined that the negotiations  with Quest Diagnostics would remain
confidential   until  they  were  either  terminated  or  led  to  a  definitive
acquisition agreement with limited conditions to closing that would increase the
likelihood of  consummating  the  acquisition.  However,  in view of the need to
protect our best interests by not having a premature  public  announcement or an
auction in advance of signing,  the board  recognized the need to ensure that it
could hold  discussions  with, and provide  confidential  information  to, third
parties  subsequent to the  execution of any  definitive  acquisition  agreement
where it could  reasonably  be expected  that such  discussions  would lead to a
superior  offer.  Similarly,  the board  recognized  the need for any definitive
acquisition   agreement   with  Quest   Diagnostics   to  include  a   so-called
"fiduciary-out"  that would give us the right to terminate  that agreement if we
entered  into a  definitive  acquisition  agreement  with a  third  party  for a
superior  offer in  consideration  of  paying  Quest  Diagnostics  a  reasonable
termination fee that would not be preclusive of such third party  interest.  The
board also recognized the need for any  exclusivity  agreement to include a form
of fiduciary  out.  The board  unanimously  authorized  Mr. Grant to contact Dr.
Mohapatra  and inform him that we would be willing to enter into an  exclusivity
agreement  with  Quest  Diagnostics  for  a  limited   duration,   with  a  full
fiduciary-out,  if Quest  Diagnostics  was willing to pursue a transaction  at a
price of not less than $44 per share,  assuming  satisfactory  due diligence was
completed, and with adequate  confidentiality  protections for us and provisions
limiting  the  risk  to  us  of  delay  and  non-consummation  of  any  possible
transaction.

     On April 13, 2005, Mr. Grant, John W. McCarty, our Chief Financial Officer,
and Michael J. Asselta,  our Chief Operating Officer, met with Dr. Mohapatra and
other members of senior management of Quest Diagnostics in Overland Park Kansas.
During  this  meeting,  we  described  each  of our  business  segments  and the
potential  benefits to customers  and cost savings  which could  potentially  be
produced  by  combining  the two  companies.  At the onset of the  meeting,  the
parties executed a Confidentiality Agreement which included customary standstill
provisions  that  prohibited  attempts  to acquire  our stock or  assets,  or to
conduct a proxy contest, without approval of our board.

     On April 15, 2005, we sent a draft of an Exclusive Negotiating Agreement to
Quest  Diagnostics  that required Quest  Diagnostics to provide its  non-binding
assent to certain terms of any  acquisition,  including a price per share of not
less  than $44 and  specified  conditions  to  closing.  On April  21,  2005,  a
representative  of Quest  Diagnostics  contacted  Joseph C. Benage,  our General
Counsel,  to inform us that  Quest  Diagnostics  would not give its  non-binding
assent to the terms  attached to the  Exclusive  Negotiating  Agreement  at that
stage of the parties'  discussion,  but would proceed with  negotiations and due
diligence without an exclusivity agreement.

     On April 22, 2005, Quest  Diagnostics  provided a letter to us stating that
it  believed  it could  reach the price  level of $44 per share,  subject to due
diligence,  and  provided  a  generalized  response  to our  view  on  potential
contractual  terms and conditions.  We then determined that we would allow Quest
Diagnostics   to  conduct  due  diligence   that  excluded   certain   sensitive
information,  and that a second level of due diligence  providing access to such
information  would be  permitted  only  after  we were  comfortable  with  Quest
Diagnostics'  views  on  price,  the  more  significant  contractual  terms  and
conditions as well as termination rights.

     Beginning on May 4, 2005 and continuing until May 24, 2005, representatives
of  Quest  Diagnostics  and its  financial  and  legal  advisers  conducted  due
diligence  regarding us at the offices of Stinson Morrison Hecker LLP, in Kansas
City, Missouri.

     On May 19, 2005,  Quest  Diagnostics  and we began  discussing an agreement
that we had with one of our managed care customers.  Quest Diagnostics expressed
concern  that  the  agreement   might  be  interpreted  to  require



                                        6


that Quest  Diagnostics  become subject to the same terms as those applicable to
us upon  acquisition  of us.  Although  we had  doubts as to Quest  Diagnostics'
interpretation,  discussions were  subsequently  held between us and the managed
care company to resolve the issue  either  through a  negotiated  settlement  or
binding arbitration.

     On May 20, 2005, Quest Diagnostics provided to us a first draft of a merger
agreement.  From May 20,  2005  until  June 9, 2005,  Quest  Diagnostics  and we
engaged in  discussions  with respect to the provisions in the draft relating to
conditions to closing, regulatory approvals and termination of the agreement.

     On May 21, 2005, Dr.  Mohapatra and a member of senior  management of Quest
Diagnostics met in Kansas City, Missouri individually with members of our senior
management  to discuss  our  service  offerings,  management  philosophies,  and
potential employment with Quest Diagnostics should a transaction be consummated.
Term sheets  setting  forth the proposed  terms of their  employment  with Quest
Diagnostics  were distributed to Mr. Grant,  Mr. Asselta,  Gregg R. Sadler,  our
Executive Vice President and President -- Insurance  Services  Division,  and L.
Patrick  James,  M.D.,  our Executive Vice President -- Laboratory and Pathology
Services.  Dr.  Mohapatra  also  discussed  the status of the  transaction  with
Messrs. Grant, Asselta, McCarty and Benage.

     On June 6, 2005,  the executive  committee of the board of directors met at
our headquarters in Lenexa,  Kansas to discuss the status of negotiations of the
provisions of the merger agreement relating to conditions to closing, regulatory
approvals and termination  rights under the agreement.  On June 7, 2005, we sent
to Quest  Diagnostics  our requested  revisions to the  specified  provisions of
Quest Diagnostics' May 20, 2005 draft of the merger agreement.

     On June 8, 2005,  Quest  Diagnostics  informed us that it was  unwilling to
proceed with an acquisition of us until it had completed the second level of due
diligence to its satisfaction and unless, among other things, the interpretation
of the managed care contract described above was resolved to its satisfaction.

     On June 10, 2005, a special  meeting of our board of directors was held via
teleconference.  The  directors  discussed  the dispute  with the  managed  care
company  and  Quest  Diagnostics'  position  that it would  not  proceed  with a
transaction   with  us  unless  the   interpretation   of  that   agreement  was
satisfactorily  resolved.  Management  reported  that it  appeared  that a quick
resolution  of the dispute was unlikely and that any formal  dispute  resolution
under the managed care contract could take up to six months or longer. The board
determined  that  formal  discussions  with Quest  Diagnostics  regarding a sale
should cease due to management's view that a quick resolution appeared unlikely.

     On July 6, 2005,  Mr.  Grant  discussed  with the members of the  executive
committee the terms of a settlement offer received from the managed care company
that  would  require  the  payment  of a  settlement  amount  by us.  Mr.  Grant
communicated  management's  view that we should  not pay the  settlement  amount
unless the payment was made in the context of completing a  transaction  for the
sale of LabOne. After discussion, the executive committee members authorized Mr.
Grant to communicate the settlement offer to Quest Diagnostics and determine how
we could be  protected  from making the  settlement  payment if a possible  sale
transaction with Quest Diagnostics was not consummated.

     On July 7, 2005,  Mr. Grant called Dr.  Mohapatra  and they  discussed  the
status of the  negotiations  with the managed  care company and how a settlement
with the managed care company  might be  structured in the context of a possible
sale transaction  between Quest  Diagnostics and us. Mr. Grant  communicated the
results of these discussions to the members of our board of directors, and Quest
Diagnostics and we then recommenced negotiations of a possible sale transaction.
Between July 8, 2005 and July 11, 2005, Mr. Grant had  additional  conversations
with members of senior management of Quest Diagnostics, including Dr. Mohapatra,
regarding how a settlement might be structured in the context of a possible sale
transaction.



                                        7


     On July 11, 2005,  we contacted  the managed  care company  concerning  its
settlement  offer and  thereafter  continued  discussions  with the managed care
company.

     On July 11, 2005, we engaged Fried, Frank, Harris, Shriver & Jacobson, LLP,
which had  previously  been  engaged as outside  legal  counsel  with respect to
antitrust  matters,  as special  outside  legal  counsel to assist in any future
merger negotiations.

     On July  12,  2005,  we  provided  Quest  Diagnostics  with  our  requested
revisions to Quest  Diagnostics' May 20, 2005 draft of the merger agreement.  On
July  13 and 14,  2005,  representatives  of  Quest  Diagnostics  and us and our
respective  outside  legal  counsels met in the New York offices of Shearman and
Sterling LLP, outside legal counsel to Quest Diagnostics, to negotiate the terms
of the merger agreement. During the meeting on July 13, 2005, representatives of
our senior  management  discussed  with  representatives  of Quest  Diagnostics'
senior management the concept of possibly adjusting the purchase price per share
based on the amount of the  settlement  payment  to the  managed  care  company.
Thereafter,  until the substantive terms of the definitive merger agreement were
completed on August 5, 2005,  the  representatives  of the parties  continued to
negotiate  the terms of the merger  agreement by telephone  and through  written
communications, and several drafts of the merger agreement were exchanged.

     Beginning   on  July  12,  2005  and   continuing   until  July  15,  2005,
representatives  of  Quest  Diagnostics   conducted   additional  due  diligence
regarding  us at the  offices of  Stinson  Morrison  Hecker LLP in Kansas  City,
Missouri.

     On July 14, 2005, the parties  reached an  understanding  on the bases upon
which the second level of due diligence would be permitted.

     On July 19, 2005, a special  meeting of our board of directors was held via
teleconference. Management described to the directors the status of negotiations
with Quest  Diagnostics and the status of the negotiations with the managed care
company.  A representative of JPMorgan then joined the meeting and reviewed with
directors,  among other things,  the recent  performance  of our stock price and
other relevant matters concerning valuation of our stock.

     On July 25 and 26, 2005, our  representatives  met with  representatives of
the managed care company to  negotiate a settlement  of the dispute.  Thereafter
the parties  continued  their  negotiations  by  telephone  and through  written
correspondence until a final resolution was reached on August 5, 2005.

      On July 31, 2005, a special meeting of the board of directors was held in
Mission Hills, Kansas. Fried, Frank, Harris, Shriver & Jacobson LLP provided an
additional review of the directors' fiduciary duties in connection with a
possible transaction with Quest Diagnostics as well as a review of the proposed
merger agreement. Representatives of JPMorgan made a presentation regarding,
among other matters, the economics of the proposed transaction and their
valuation analysis of our stock. The representatives concluded that subject to
reviewing the terms of the final merger agreement and changes in market
conditions prior to final board approval, JPMorgan would be in a position to
issue an opinion, based upon and subject to the considerations described in its
opinion and other matters as JPMorgan considered relevant, that the
consideration to be received by the holders of common stock in the proposed
merger was fair, from a financial point of view, to such holders. Management
reviewed with the directors the recent performance of our businesses and the
bases for their recommendation to approve the proposed transaction.

     During  the week of August 1,  2005,  the  representatives  of the  parties
continued to negotiate the terms of the merger agreement, including the purchase
price per share,  the amount of the termination fee and reimbursed  expenses and
the  terms  and  conditions  pursuant  to  which  those  amounts  would be paid.
Ultimately,  and subject to



                                        8


the  approval of each  party's  board of  directors,  the parties  agreed upon a
purchase price of $43.90,  a termination fee of $26.5 million and an expense cap
of $3.5 million.

     During the week of August 1, 2005, Quest  Diagnostics  reached agreement on
the terms of their employment by the surviving  corporation with Messrs.  Grant,
Asselta,  Sadler  and  James and with  Philip A.  Spencer,  our  Executive  Vice
President -- Healthcare Marketing. Also during the week of August 1, 2005, Quest
Diagnostics continued its due diligence review of us.

     On August 5, 2005, a special meeting of our board of directors was held via
teleconference.  The directors reviewed the changes made to the merger agreement
since the prior meeting of the  directors.  JPMorgan  presented a summary of its
financial  analyses  relating to the proposed  merger and responded to questions
posed by our board of directors.  In  connection  with the  deliberation  by our
board of directors,  JPMorgan provided its oral opinion (subsequently  confirmed
in  writing)  that,  as of the date of the opinion and based upon and subject to
the  considerations  described  in  JPMorgan's  written  opinion  and such other
matters as JPMorgan considered relevant, the consideration to be received by the
holders of common stock in the proposed  merger was fair, from a financial point
of view,  to such  holders.  The directors  reviewed  information  regarding the
compensation  to be received and employment  arrangements  to be entered into by
the  executive  officers  in  connection  with  the  merger.  Following  further
discussion,  the directors,  among other things, unanimously approved the merger
agreement,  determined  that the merger  agreement and the merger were advisable
and in the best interests of us and our  shareholders,  directed that the merger
agreement be submitted for approval of our shareholders and recommended that our
shareholders  vote in favor of the  approval of the merger  agreement.  JPMorgan
confirmed its opinion in writing on August 6, 2005.

     On August 6, 2005, the board of directors of Quest Diagnostics  unanimously
approved the merger agreement.

     The merger  agreement was signed by the parties  effective  August 8, 2005,
and before  the  commencement  of  trading  on Nasdaq on August 8,  2005,  Quest
Diagnostics and we issued a joint press release  announcing the execution of the
merger agreement.

Recommendation of LabOne's Board and Reasons for the Merger

     Our board of  directors  believes  the terms of the  merger  agreement  are
advisable and in the best interests of us and our shareholders.  Accordingly, at
the  meeting  of our  board of  directors  on  August  5,  2005,  our  directors
unanimously approved the merger agreement.  The directors  unanimously recommend
that our shareholders vote "FOR" approval of the merger agreement.

     In the  course  of  reaching  its  determination,  our  board of  directors
consulted  with legal  counsel with respect to its legal duties and the terms of
the merger  agreement.  In addition,  our board of directors  consulted with its
financial  advisor  with  respect to the  financial  aspects and fairness of the
transaction  from  a  financial  point  of  view,  and  with  senior  management
regarding,  among  other  things,  financial  aspects,  operational  matters and
strategic  alternatives.  The terms of the  merger  agreement  are the result of
arm's length negotiations.

     In reaching its  determination  that the merger is advisable to, and in the
best interests of, our shareholders,  our board of directors considered a number
of factors, including, without limitation, the following:

          o    the   presentations   and  views   expressed  by  our  management
               regarding,  among  other  things:  (1) our  financial  condition,
               results of operations,  cash flows,  business and prospects;  (2)
               the  likelihood  of  achieving   maximum  long-term  value  on  a
               stand-alone basis; (3) the strategic alternatives available to us
               and the  associated  advantages  and  disadvantages;  and (4) the
               recommendation by our management to approve the merger agreement;



                                        9


          o    the range of potential values if we remained  independent and the
               execution and other risks inherent in remaining  independent  and
               achieving  our strategic  plan,  including  business,  market and
               competitive risks,  pricing pressures due to, among other things,
               consolidation  in the life insurance  industry and risks that our
               risk assessment  business would be valued at lower multiples than
               our other faster-growing businesses;

          o    the  premium of the merger  consideration  of $43.90 per share to
               the  closing  price  per  share on the  trading  day  immediately
               preceding our announcement of the merger agreement,  $37.64,  the
               average closing price per share price of our common stock for the
               previous one month,  $39.39,  the previous three months,  $39.10,
               the previous six months,  $36.94, and the previous twelve months,
               $33.65,  as well as being greater than the trailing 52-week high,
               $40.75;

          o    the fact that the merger  consideration  to be paid is cash which
               provides  certainty  of  value  and  immediate  liquidity  to our
               shareholders;

          o    the  financial  presentation  of  JPMorgan,  and its oral opinion
               issued to the board of  directors  on August 5, 2005  (which  was
               confirmed  in  writing  on August 6,  2005)  that  based upon and
               subject to the  considerations  described in its written  opinion
               and such  other  matters as  JPMorgan  considered  relevant,  the
               consideration  to be received  by the holders of common  stock in
               the  merger was fair,  from a  financial  point of view,  to such
               holders  as  described  more  fully  below  under  "--Opinion  of
               LabOne's Financial Advisor";

          o    the terms and conditions of the merger  agreement,  including the
               parties'   representations,   warranties   and   covenants,   the
               conditions  to  their  respective  obligations  and  the  limited
               ability of the parties to terminate the merger agreement;

          o    the likelihood that the merger would be consummated,  in light of
               the  experience,  reputation  and  financial  capability of Quest
               Diagnostics,  the  absence  of  any  financing  condition  to the
               obligation of Quest  Diagnostics to complete the merger,  and the
               likelihood of obtaining required regulatory approvals;

          o    the  likelihood  that a  superior  offer from  another  potential
               purchaser  would  be made was  insufficient  to  justify  seeking
               alternative  proposals from any potential  purchasers and risking
               not  proceeding  with  the  favorable   transaction   with  Quest
               Diagnostics  as well as risking the  potential  loss of customers
               and  employees   without  a  high  degree  of  assurance  that  a
               transaction would be consummated;

          o    provisions  in the  merger  agreement  permitting  our  board  of
               directors,   in  the  exercise  of  its  duties  to  us  and  our
               shareholders   under   applicable   Missouri   law,   to  furnish
               information   and  data,   and   enter   into   discussions   and
               negotiations,  in  connection  with  a  competing  proposal  that
               constitutes  or may be reasonably  expected to lead to a superior
               proposal  (as  defined  in  the  merger  agreement),  subject  to
               conditions specified in the merger agreement;

          o    provisions  in the  merger  agreement  permitting  our  board  of
               directors,   in  the  exercise  of  its  duties  to  us  and  our
               shareholders  under  applicable  Missouri  law, to terminate  the
               merger  agreement  in favor of a superior  proposal or to provide
               the board of  directors'  recommendation  in favor of a competing
               transaction,  taking into account that following such termination
               or  recommendation,  we must pay Quest Diagnostics a fee of $26.5
               million  which  is  within a range of  termination  fees  that is
               customary  for  transactions  of this  type  and  size and is not
               expected  to  preclude  a third  party  from  making a  competing
               transaction;



                                       10


          o    the fact that the merger  agreement  would be subject to approval
               by the holders of at least  two-thirds of our outstanding  shares
               of our common stock; and

          o    the  ability of  shareholders  who may not  support the merger to
               obtain "fair value" for their shares if they properly perfect and
               exercise their  dissenters'  rights under Section  351.455 of the
               MGBCL,  which  provides  shareholders  with  the  opportunity  to
               exercise appraisal rights and to seek a judicial determination as
               to  the  fair  value  of  their   shares  of  common  stock  (see
               "--Dissenters'  Rights" for  information  on how to exercise your
               appraisal rights).

     In the course of its deliberations,  our board of directors also considered
a variety of potentially  countervailing factors in its deliberations concerning
the merger, including the following:

          o    the fact that we will no longer  exist as an  independent  public
               company and our  shareholders  will forgo any future  increase in
               our value that might result from our possible growth;

          o    the risks  and  contingencies  related  to the  announcement  and
               pendency of the merger, including the impact of the merger on our
               employees, customers and our relationships with third parties;

          o    the conditions to Quest  Diagnostics'  obligation to complete the
               merger and the right of Quest Diagnostics to terminate the merger
               agreement in certain circumstances;

          o    the risk that the merger might not receive  necessary  regulatory
               approvals   and   clearances  to  complete  the  merger  or  that
               governmental authorities could attempt to condition the merger on
               one or more of the parties'  compliance  with certain  burdensome
               terms or  conditions  beyond  those  which Quest  Diagnostics  is
               required to undertake under the merger agreement; o the fact that
               under the terms of the merger agreement,  we cannot solicit other
               acquisition  proposals  and  must  pay  to  Quest  Diagnostics  a
               termination  fee of $26.5  million,  if the merger  agreement  is
               terminated  under certain  circumstances,  which,  in addition to
               being costly, might have the effect of discouraging other parties
               from  proposing  an  alternative  transaction  that might be more
               advantageous to our shareholders than the merger;

          o    the fact that the merger  consideration  consists  solely of cash
               and  will  therefore  be  taxable  to our  shareholders  for U.S.
               federal income tax purposes;

          o    the  interests  that  certain  of  our  directors  and  executive
               officers  may have with  respect to the  merger,  in  addition to
               their interests as our  shareholders  generally,  as described in
               "THE MERGER -- Interests of Certain Persons in the Merger;"

          o    the  fact  that,  pursuant  to  the  merger  agreement,  we  must
               generally  conduct our business in the ordinary course and we are
               subject to a variety of other  restrictions on the conduct of our
               business  prior to closing of the  merger or  termination  of the
               merger  agreement,  which may delay or prevent  us from  pursuing
               business  opportunities  that may arise or preclude  actions that
               would be advisable if we were to remain an independent company;

          o    if the merger does not close,  our officers  and other  employees
               will have expended  extensive efforts  attempting to complete the
               transaction and will have  experienced  significant  distractions
               from their work during the pendency of the transaction; and

          o    we will have incurred substantial transaction costs in connection
               with the transaction  and such costs will  negatively  impact our
               operating results.


                                       11


     Our  board of  directors  concluded  that  these  potential  countervailing
factors did not outweigh  the benefits of the merger to us and our  shareholders
and that such factors were satisfactorily  addressed by the amount of the merger
consideration and the terms and conditions of the merger agreement.

     As part of our board of directors'  consideration of the  transaction,  our
board of directors was aware of,  discussed  with  management  and its financial
advisor and  considered  the amount of cash held by us. As of June 30, 2005,  we
had cash, cash  equivalents and short-term  investments of  approximately  $24.3
million.

     The preceding  discussion is not meant to be an exhaustive  description  of
the information and factors considered by our board of directors but is believed
to address the material information and factors considered.  In view of the wide
variety of factors  considered in connection  with its  evaluation of the merger
and the  complexity  of these  matters,  our board of directors  did not find it
practicable  to, and did not,  quantify or otherwise  attempt to assign relative
weights to the various  factors  considered  in reaching its  determination.  In
considering the factors  described  above,  individual  members of the board may
have given different weight to different factors.

Opinion of LabOne's Financial Advisor

     Pursuant  to an  engagement  letter  dated April 5, 2005,  LabOne  retained
JPMorgan as its financial  advisor in connection  with the proposed  transaction
and to render an opinion to the board of directors of LabOne as to the fairness,
from a  financial  point of view,  of the  consideration  to be  received by the
holders of LabOne common stock in the proposed merger.  JPMorgan was selected by
the  board of  directors  based on  JPMorgan's  qualifications,  reputation  and
substantial  experience  with  transactions  similar to the  merger,  as well as
JPMorgan's  familiarity with LabOne.  JPMorgan  rendered its oral opinion to the
board of  directors on August 5, 2005 (as  subsequently  confirmed in writing on
August 6, 2005),  that, as of that date, the consideration to be received by the
holders of common stock in the proposed  merger was fair, from a financial point
of view, to those holders.

     The full text of the written opinion  delivered by JPMorgan to the board of
directors,  dated August 6, 2005, which sets forth the assumptions made, general
procedures  followed,  matters  considered  and  limitations on the scope of the
review undertaken by JPMorgan in rendering its opinion,  is attached as Appendix
B to this document and is incorporated  herein by reference.  JPMorgan's opinion
is directed to the board of directors of LabOne and addresses the fairness, from
a financial  point of view, to the holders of common stock of the  consideration
to be  received  by those  holders in the merger.  JPMorgan's  opinion  does not
constitute a  recommendation  to any shareholders as to how to vote with respect
to the proposed transaction.  The shareholders are urged to read such opinion in
its entirety.  JPMorgan's  opinion did not address the merits of the  underlying
decision by LabOne to engage in the merger.  This  summary is  qualified  in its
entirety by reference to the full text of such opinion.

     In arriving at its opinion, JPMorgan:

          o    reviewed a draft dated August 5, 2005 of the merger agreement;

          o    reviewed  certain  publicly   available  business  and  financial
               information  concerning  LabOne  and the  industries  in which it
               operates;

          o    compared  the  proposed  financial  terms of the merger  with the
               publicly  available  financial  terms  of  certain   transactions
               involving    companies   JPMorgan   deemed   relevant   and   the
               consideration received for such companies;

          o    compared the financial and operating  performance  of LabOne with
               publicly available information concerning certain other companies
               JPMorgan  deemed relevant and reviewed the current and historical
               market  prices of the LabOne  common  stock and certain  publicly
               traded securities of such other companies;



                                       12


          o    reviewed  certain  internal   financial  analyses  and  forecasts
               prepared by the  management  of LabOne  relating to its business;
               and

          o    performed   such  other   financial   studies  and  analyses  and
               considered such other information as JPMorgan deemed  appropriate
               for the purposes of the JPMorgan opinion.

     JPMorgan also held  discussions  with certain  members of the management of
LabOne with respect to certain  aspects of the merger,  and the past and current
business  operations of LabOne, the financial condition and future prospects and
operations  of  LabOne,   and  other  matters  JPMorgan  believed  necessary  or
appropriate to JPMorgan's inquiry.

     In giving its opinion,  JPMorgan relied upon and assumed,  without assuming
responsibility  or  liability  for  independent  verification,  the accuracy and
completeness of all information that was publicly  available or was furnished to
or discussed  with JPMorgan by LabOne or otherwise  reviewed by or for JPMorgan.
JPMorgan  did  not  conduct  any   valuation  or  appraisal  of  any  assets  or
liabilities,  nor  did  JPMorgan  evaluate  the  solvency  of  LabOne  or  Quest
Diagnostics  under any state or federal laws relating to bankruptcy,  insolvency
or similar matters.  In relying on financial  analyses and forecasts provided to
JPMorgan,  JPMorgan  assumed that such  analyses and forecasts  were  reasonably
prepared based on assumptions  reflecting the best currently available estimates
and judgments by management as to the expected  future results of operations and
financial  condition  of LabOne  to which  the  analyses  or  forecasts  relate.
JPMorgan  expressed no view as to such analyses or forecasts or the  assumptions
on which  they were  based.  JPMorgan  also  assumed  that the  merger and other
transactions  contemplated  by the  merger  agreement  would be  consummated  as
described in the merger  agreement,  and that the  definitive  merger  agreement
would not differ in any  material  respect from the draft  thereof  furnished to
JPMorgan.  JPMorgan  relied,  as to all legal matters  relevant to rendering its
opinion, upon the advice of its legal counsel. JPMorgan further assumed that all
material governmental,  regulatory or other consents and approvals necessary for
the  consummation  of the merger will be obtained  without any adverse effect on
LabOne.

     JPMorgan's  opinion was  necessarily  based on  economic,  market and other
conditions as in effect on, and the  information  made  available to JPMorgan as
of, August 5, 2005. Subsequent  developments may affect the JPMorgan opinion and
JPMorgan  does not have any  obligation  to  update,  revise,  or  reaffirm  its
opinion.  JPMorgan's opinion is limited to the fairness,  from a financial point
of view, of the  consideration  to be received by the holders of common stock in
the proposed merger and JPMorgan  expressed no opinion as to the fairness of the
merger  to,  or any  consideration  of,  the  holders  of  any  other  class  of
securities,  creditors or other constituencies of LabOne or as to the underlying
decision by LabOne to engage in the merger.

     JPMorgan  noted  that it was not  authorized  to and  did not  solicit  any
expressions  of interest  from any other parties with respect to the sale of all
or any  part of  LabOne  or any  other  alternative  transaction.  Consequently,
JPMorgan assumed that the terms of the merger are the most beneficial terms from
LabOne's  perspective that could under the circumstances be negotiated among the
parties to the  transaction  and  JPMorgan  does not  express  any opinion as to
whether any alternative  transaction  might produce  consideration  for LabOne's
shareholders in an amount in excess of that contemplated in the merger.

     The  following  is a  brief  summary  of the  material  financial  analyses
performed by JPMorgan in connection  with  providing its opinion to the board of
directors on August 5, 2005, as  subsequently  confirmed in writing on August 6,
2005.  Some of the  summaries  of the  financial  analyses  include  information
presented in tabular format.  To fully  understand the financial  analyses,  the
tables should be read together  with the text of each summary.  Considering  the
data set forth in the table without considering the narrative description of the
financial analyses,  including the methodologies and assumptions  underlying the
analyses,  could  create  a  misleading  or  incomplete  view  of the  financial
analyses.



                                       13


     Historical Stock Price Analysis

     JPMorgan reviewed the historical daily closing trading prices of the common
stock for the 52 weeks ending  August 4, 2005 and  reviewed the average,  lowest
and highest values among this data set. The analysis indicated that the average,
highest and lowest  trading  prices of the common  stock for the 52 weeks ending
August 4, 2005, were $33.62, $40.75 and $26.91,  respectively.  The price of the
common  stock as of August 4, 2005,  was $38.41,  which was 94.3% of the 52 week
high of $40.75.  The analysis indicated that the consideration to be received by
the holders of common stock in the proposed merger represented:

          o    a premium of 14.3% based on the closing price of the common stock
               on August 4, 2005 of $38.41;

          o    a premium of 11.2% based on the 1-month  average closing price as
               of August 4, 2005 of $39.47;

          o    a premium of 12.2% based on the 3-month  average closing price as
               of August 4, 2005 of $39.13;

          o    a premium of 18.9% based on the 6-month  average closing price as
               of August 4, 2005 of $36.94; and

          o    a premium of 30.6% based on the 1-year  average  closing price as
               of August 4, 2005 of $33.62.

     Comparison of Trading Multiples

     Using  public  SEC  filings,  company  press  releases,  selected  publicly
available Wall Street equity  research and brokerage firm  estimates,  and other
publicly  available   information,   JPMorgan  compared  financial  information,
financial   ratios  and  public  market   valuation   multiples  for  LabOne  to
corresponding  measures for three publicly  traded clinical  laboratory  testing
companies.  The companies  reviewed in connection  with this analysis were Quest
Diagnostics,  Laboratory  Corporation  of  America  Holdings  and  Bio-Reference
Laboratories Inc.

     Although none of the selected  companies is directly  comparable to LabOne,
the  companies  were chosen  because they are  publicly  traded  companies  with
businesses and operations that, for purposes of the analysis,  may be considered
similar to certain  operations  of LabOne.  The  financial  ratios and valuation
multiples of LabOne and the selected companies were calculated using the closing
prices of the common  stock of LabOne and the  selected  companies  on August 4,
2005.

     JPMorgan  calculated  the  enterprise  values  of LabOne  and the  selected
companies  as  multiples  of the  estimated  earnings  before  interest,  taxes,
depreciation and amortization  (excluding minority interest)  ("EBITDA") for the
2005  and 2006  calendar  years  for  LabOne  and the  selected  companies.  The
enterprise  value of each company was  calculated  by JPMorgan as  fully-diluted
market  capitalization of each company as of August 4, 2005 plus total debt less
total cash and cash equivalents of each respective company as of the most recent
relevant  public SEC filing date for each company.  JPMorgan also calculated the
ratio of the stock  price as of August 4,  2005 to the  estimated  earnings  per
share  for each  company  for the 2005 and 2006  calendar  years  estimated  and
published by Wall Street  equity  research and  brokerage  firms.  The following
table presents the summary results of this analysis:

            Enterprise                       Enterprise
            Value/2005E                      Value/2006E
              EBITDA      Price/2005E EPS      EBITDA      Price/2006E EPS
Median         9.5x            17.8x            8.7x            16.1x
Mean           10.1x           19.5x            8.8x            16.2x
High           11.5x           23.4x            9.0x            16.9x
Low            9.3x            17.4x            8.5x            15.5x



                                       14


     In  conducting  its  analysis,  JPMorgan  considered  two sets of  distinct
financial projection cases for LabOne that were prepared by LabOne's management,
referred to as Case A and Case B. Case B, which was LabOne's existing  five-year
plan,  assumed  higher  estimated  annual revenue growth rates for the projected
years  compared to Case A. Case B also assumed higher annual profits and margins
than those  used in Case A with  higher  capital  expenditures  and net  working
capital requirements.  Following a review of LabOne's anticipated second quarter
results and discussions with  representatives of JPMorgan,  management concluded
that the growth  assumptions  in Case B may be  optimistic in view of the recent
historical  financial  performance of the risk assessment business and therefore
prepared Case A as an additional  case  reflecting the possible  continuation of
trends implicit in such performance.

     Based on this analysis and based on management's  projected  financial Case
A, JPMorgan selected a range of multiples of:

          o    enterprise value to estimated 2005 EBITDA of 9.0x to 10.5x;

          o    enterprise value to estimated 2006 EBITDA of 8.0x to 9.0x;

          o    stock  price to  estimated  2005  earnings  per share of 17.0x to
               21.0x; and

          o    stock  price to  estimated  2006  earnings  per share of 15.0x to
               19.0x.

     This range of  multiples  implied a range of equity  value per share  under
Case A of $25.50 to $38.00 for LabOne (rounded to the nearest  $0.25),  based on
management  estimates of 2005 EBITDA and 2006 EBITDA of $74.6  million and $77.5
million,  respectively,  and of 2005  earnings  per share and 2006  earnings per
share of $1.72 and $1.69, respectively, and based on the fully diluted shares of
LabOne  common  stock  outstanding,  including  the common share  equivalent  of
outstanding  options  calculated using the treasury method. For purposes of this
analysis,  since LabOne's  convertible debt is not qualified for conversion into
shares at the range of implied equity values per share outlined above,  JPMorgan
included the face value of the convertible debt as part of LabOne's total debt.

     Based on the above analysis and based on management's  projected  financial
Case B, JPMorgan also selected a range of multiples of:

          o    enterprise value to estimated 2005 EBITDA of 9.5x to 11.0x;

          o    enterprise value to estimated 2006 EBITDA of 8.5x to 9.5x;

          o    current stock price to estimated 2005 earnings per share of 18.0x
               to 22.0x; and

          o    current  stock price to estimated  earnings per share of 16.0x to
               20.0x.

     This range of  multiples  implied a range of equity  value per share  under
Case B of $31.00 to $40.00 for LabOne (rounded to the nearest  $0.25),  based on
management  estimates of 2005 EBITDA and 2006 EBITDA of $74.6  million and $86.6
million,  respectively,  and of 2005  earnings  per share and 2006  earnings per
share of $1.72 and $2.00, respectively, and based on the fully diluted shares of
LabOne  common  stock  outstanding,  including  the common share  equivalent  of
outstanding  options  calculated using the treasury method. For purposes of this
analysis,  since  LabOne's  convertible  debt  is not  uniformly  qualified  for
conversion  into  shares  within  the range of implied  equity  values per share
outlined above, JPMorgan included the face value of the convertible debt as part
of LabOne's total debt for the range of implied equity values per share that was
less than the conversion price of the convertible debt. For the range of implied
equity values per share that was equal to or greater than the conversion


                                       15


price,  JPMorgan  included  the face  value of the  convertible  debt as part of
LabOne's  total debt and included the common  share  equivalent  of the residual
value of the  convertible  debt above its face value as part of  LabOne's  fully
diluted shares outstanding.

     Selected Historical Transactions Multiples Analysis

     Using  publicly  available  information,  JPMorgan  examined the  following
transactions involving US clinical laboratory testing companies:

      Date                   Acquiror                        Target
  Transaction
   Announced
March 30, 2005     Laboratory Corp. of America     Esoterix, Inc.
                   Holdings
December 14,       Laboratory Corp. of America     US Pathology Labs, Inc.
2004               Holdings
December 9, 2002   Welsh Carson Anderson & Stowe   AmeriPath, Inc.
November 11,       Laboratory Corp. of America     Dianon Systems, Inc.
2002               Holdings
April 2, 2002      Quest Diagnostics               UniLab Corporation
February 7, 2002   Quest Diagnostics               American Medical
                                                   Laboratories, Inc.
June 28, 2001      Dianon Systems, Inc.            UroCor, Inc.
May 9, 2002        Laboratory Corp. of America     Dynacare Inc.
                   Holdings
March 27, 2001     Laboratory Corp. of America     US Pathology Labs, Inc.
                   Holdings

     Based on public SEC filings, publicly available Wall Street equity research
and brokerage firm reports,  publicly available company press releases and other
publicly  available  information,  JPMorgan  calculated  the implied  enterprise
values of the target companies in the transactions as multiples of the latest 12
month EBITDA  (excluding  minority  interests)  for the target  companies in the
selected transactions.

     The following table presents the summary results of this analysis:

                           Enterprise
                           Value/
                           LTM EBITDA
                 Median    12.5x
                 High      21.0x
                 Low       7.6x

     Based on this analysis, JPMorgan selected a range of multiples of estimated
EBITDA of the last 12 months of 12.5x to 14.5x for LabOne, which implied a range
of equity  value per share of $39.75 and $47.00  (rounded to the nearest  $0.25)
for LabOne based on last 12 month EBITDA for LabOne of $67.7  million as of June
30,  2005  and  based  on the  fully  diluted  shares  of  LabOne  common  stock
outstanding,  including  the common  share  equivalent  of  outstanding  options
calculated  using the  treasury  method.  For purposes of this  analysis,  since
LabOne's  convertible  debt is qualified for conversion into shares at the range
of implied equity values per share outlined above,  JPMorgan  included the value
of the common share equivalent of the convertible  debt,  including the value of
additional  shares to be issued as a result of an  increase  in the  convertible
debt's  conversion rate resulting from the proposed merger,  as part of LabOne's
total debt.

     None of the  companies  or the  selected  transactions  used  in the  above
analysis is identical to LabOne or the merger.  Accordingly,  an analysis of the
results  of  the  foregoing  necessarily  involves  complex  considerations  and
judgments concerning  differences in financial and operating  characteristics of
the  companies  and the selected  transactions  and other  factors that may have
affected the selected transactions and/or affect the merger.



                                       17


     Discounted Cash Flow Analysis

     JPMorgan  calculated  a range of  discounted  cash flows for  LabOne  using
projections  based on  management  forecasts  and  calculated a range of implied
equity  values per common  share  based on the sum of (i) the  present  value of
projected,  standalone,  after-tax,  unlevered  free cash flows of LabOne  after
minority  interests  for fiscal  periods from 2004 through  fiscal year 2014 and
(ii) the  present  value of the  projected  terminal  value,  based on an annual
perpetuity revenue growth rate. JPMorgan calculated a range of values for LabOne
by utilizing a cost of capital range of 9.75% to 10.25% and  perpetuity  revenue
growth rate ranging from 3.25% to 3.75%.  JPMorgan  applied these ranges to both
of the projected financial cases prepared by LabOne's management.

     Based on the foregoing  calculations  and based on  management's  financial
projection Case A, JPMorgan derived a range of illustrative  values on an equity
value per share basis, as of August 8, 2005, of $24.50 to $28.25 (rounded to the
nearest  $0.25) per share of common stock,  based on the fully diluted shares of
LabOne  common  stock  outstanding,  including  the common share  equivalent  of
outstanding  options  calculated using the treasury method. For purposes of this
analysis,  since LabOne's  convertible debt is not qualified for conversion into
shares at the range of implied equity values per share outlined above,  JPMorgan
included the face value of the convertible debt as part of LabOne's total debt.

     Also based on the above  calculations  and based on management's  financial
projection Case B, JPMorgan derived a range of illustrative  values on an equity
value per share basis, as of August 8, 2005, of $44.00 to $50.00 (rounded to the
nearest  $0.25) per share of common stock,  based on the fully diluted shares of
LabOne  common  stock  outstanding,  including  the common share  equivalent  of
outstanding  options  calculated using the treasury method. For purposes of this
analysis,  since  LabOne's  convertible  debt is qualified for  conversion  into
shares at the range of implied equity values per share outlined above,  JPMorgan
included the face value of the  convertible  debt as part of LabOne's total debt
and  included  the  common  share  equivalent  of  the  residual  value  of  the
convertible  debt above its face value as part of LabOne's  fully diluted shares
outstanding.

     Pursuant to an engagement  letter dated April 5, 2005,  between  LabOne and
JPMorgan,  JPMorgan has acted as financial advisor to LabOne with respect to the
proposed  merger  and  LabOne  will pay to  JPMorgan a fee equal to 0.70% of the
consideration  payable to the  shareholders of LabOne in the merger.  The fee is
payable in installments as follows: (i) an initial installment of $1 million was
due upon delivery of the JPMorgan  opinion and (ii) the balance shall be payable
upon  closing of the merger.  LabOne will also  indemnify  JPMorgan  for certain
liabilities arising out of JPMorgan's  engagement and reimburse JPMorgan for its
reasonable expenses incurred up to a maximum of $50,000, unless otherwise agreed
to by  LabOne.  JPMorgan  and its  affiliates  have from  time to time  provided
investment banking and commercial  banking services to LabOne,  including acting
as bookrunning lead managing underwriter in connection with LabOne's offering of
its convertible debt securities in 2004.  JPMorgan's  affiliate,  JPMorgan Chase
Bank,  National  Association,  acts as  administrative  agent  with  respect  to
LabOne's revolving credit facility and is a lender to Quest Diagnostics.  In the
ordinary  course of our  businesses,  JPMorgan and its  affiliates  may actively
trade  the debt and  equity  securities  of  LabOne  or  Quest  Diagnostics  for
JPMorgan's  own  account or for the  accounts  of  customers  and,  accordingly,
JPMorgan may at any time hold long or short positions in such securities.

Interests of Certain Persons in the Merger

     In considering the  recommendation of our board of directors  regarding the
merger,  our  shareholders  should be aware  that the  directors  and  executive
officers identified below have interests in the merger that differ from those of
other  shareholders,  as described  below.  Our board of directors  was aware of
these  interests  and  considered  them,  among  other  matters,  in making  its
recommendation  to approve the merger  agreement.  Our shareholders  should take
these  benefits  into  account in deciding  whether to vote for  approval of the
merger agreement.

     Acceleration  of Stock Options.  At the effective time of the merger,  each
outstanding  stock option will become fully  vested and  exercisable.  All stock
options  will be cancelled at the  effective  time of the merger.  The holder of
each stock option will generally be entitled to receive, in full satisfaction of
the rights of such holder with



                                       18


respect to such stock options, an amount in cash equal to the excess, if any, of
the merger  consideration  of $43.90 per share over the exercise price per share
of our common stock  subject to such stock  option,  multiplied by the number of
shares of our common stock  subject to such stock option,  less any  withholding
taxes. See "THE MERGER AGREEMENT - Treatment of Outstanding Stock Options."

     The following table  summarizes the vested and unvested options held by our
executive  officers  and  directors as of  ____________,  and the value of these
options  based  on the  difference  between  the  merger  consideration  and the
exercise price of those options:



                     Shares        Shares
                    Subject to    Subject to   Value of      Value of        Total
                    Outstanding   Exercisable   Vested       Unvested        Value
 Name                Options       Options    Options (1)   Options (1)   Of Options
 ----               -----------   ----------  ------------  ------------  -----------
                                                                  
 Michael J. Asselta    175,000       69,000   $ 1,295,250   $ 2,071,000   $3,366,250
 Joseph C. Benage      133,517       81,517     2,543,450       712,360    3,255,810
 Jill L. Force           2,929          550         7,458        21,115       28,573
 W. Thomas Grant,      428,875      274,955     6,511,042     2,767,760    9,278,802
 II
 Troy L. Hartman        76,950       16,950       297,263     1,283,094    1,580,357
 L. Patrick James       35,000        7,000       104,590       418,360      522,950
 Lawrence N.             1,632            0             0         9,135        9,135
 Kugelman
 John P. Mascotte        7,270        3,441        76,037        55,612      131,649
 Kent J. McAllister     35,000            0             0       474,600      474,600
 John W. McCarty       155,269       71,269     1,344,918     1,455,000    2,799,918
 Gregg R. Sadler       124,769       74,769     1,828,724       920,000    2,748,724
 James R. Seward         9,005        5,788       154,087        41,230      195,317
 Philip A. Spencer      55,000       11,000       150,450       601,800      752,250
 John E. Walker          9,695        6,478       167,714        41,230      208,945
                    -----------   ----------  ------------  ------------  -----------
       TOTALS        1,249,911      622,717   $14,480,982   $10,872,297   $25,353,279
                    ===========   ==========  ============  ============  ===========


(1) The value of each option equals the amount by which the merger consideration
of $43.90 per share  exceeds the  exercise  price per share,  multiplied  by the
number of shares of our common stock subject to the option.

     Future  Employment.  Certain of our employees have entered into  employment
agreements with us on behalf of Quest  Diagnostics which are contingent upon the
approval  of and  the  consummation  of the  merger.  Each of  those  employment
agreements was executed in connection with the merger  agreement and will become
effective  only  upon  the  closing  of the  merger  and the  execution  by such
executive officer of a  non-competition,  non-solicitation,  non-disclosure  and
confidentiality agreement with Quest Diagnostics.

     W. Thomas  Grant,  II  Employment  Agreement.  Mr.  Grant will serve as the
Senior Vice President of the surviving  corporation in the merger,  reporting to
the  Chairman  and Chief  Executive  Officer  of Quest  Diagnostics.  Mr.  Grant
relinquished   his  right  to   approximately   $1,360,000  of  cash   severance
compensation  to which  he  would  be  entitled  under  his  current  employment
agreement  by  virtue  of the  merger  in  consideration  of his new  employment
agreement.

     Michael J.  Asselta  Employment  Agreement.  Mr.  Asselta will serve as the
Executive Director,  Merger Integration of the surviving corporation,  reporting
to the regional vice president of Quest  Diagnostics.  Mr. Asselta  relinquished
his right to approximately  $778,000 of cash severance  compensation to which he
would be entitled under his current employment agreement by virtue of the merger
in consideration of his new employment agreement.

     Philip A.  Spencer  Employment  Agreement.  Mr.  Spencer will serve as Vice
President,  Sales of the  surviving  corporation,  reporting  to the Senior Vice
President of the surviving  corporation.  Mr. Spencer  relinquished his right


                                       18


to  approximately  $335,000 of cash severance  compensation to which he would be
entitled  under his  current  employment  agreement  by virtue of the  merger in
consideration of his new employment agreement.

     Gregg R. Sadler  Employment  Agreement.  Mr.  Sadler will serve as the Vice
President,  Insurance Services Group of the surviving corporation,  reporting to
the Senior Vice President of the surviving corporation.  Mr. Sadler relinquished
his right to approximately  $700,000 of cash severance  compensation to which he
would be entitled by virtue of the merger under his current employment agreement
in consideration of his new employment agreement.

     L. Patrick James, M.D.  Employment  Agreement.  Dr. James will serve as the
Senior Managing Director of the surviving corporation, reporting to the regional
vice  president  of Quest  Diagnostics.  Dr.  James  relinquished  his  right to
approximately  $300,000  of cash  severance  compensation  to  which he would be
entitled  by virtue of the merger  under his  current  employment  agreement  in
consideration of his new employment agreement.

     The following table summarizes the salary,  signing bonus, annual bonus and
equity compensation that may be received by these executive officers pursuant to
their new employment agreements.



                                                             Number of
                                                  Maximum   options that  Value of
                                                  Annual       may be     Shares of
                            Base     Signing      Bonus for   granted in  Restricted
Officer                    Salary    Bonus (1)    2006 (2)     2006 (3)   Stock (4)

                                                               
W. Thomas Grant, II       $ 365,000  $ 150,000    $403,000    70,000     $250,000
Michael J. Asselta          240,000    125,000     240,000    30,000      200,000
Philip A. Spencer           185,000    110,000     136,000    18,000      180,000
Gregg R. Sadler             210,000    125,000     157,500    12,000      200,000
L.  Patrick  James, M.D     310,000     75,000     170,500    10,000       75,000
-------------


(1) The respective  signing bonus is to be paid as soon as practicable after the
effective date of the respective new employment  agreement upon  consummation of
the merger.
(2) Each  employee  will be eligible  under his new  employment  agreement for a
special annual  performance  bonus for each of fiscal years 2006, 2007 and 2008,
in the amount of $38,000  for Mr.  Grant,  25% of base  salary for Mr.  Asselta,
$25,000 for 2006, $18,900 for 2007 and $12,800 for 2008 for Mr. Spencer,  25% of
base salary for Mr. Sadler, and 15% of base salary for Dr. James, based upon the
achievement of performance metrics (as determined by Quest Diagnostics) relating
to the effective  integration  and growth of the business for which the employee
is responsible.  For each employment period during the respective new employment
agreement,  the  respective  employee will be eligible for an annual bonus under
the Quest  Diagnostics  Senior  Management  Incentive Plan not to exceed 100% of
base  salary for Mr.  Grant,  75% of base  salary for Mr.  Asselta,  60% of base
salary  for Mr.  Spencer,  50% of base  salary for Mr.  Sadler,  and 40% of base
salary  for Dr.  James.  In  addition,  Mr.  Asselta is  entitled  to receive an
additional  bonus of $25,000 for each additional  six-month  extension period of
Mr. Asselta's initial employment term under his new employment agreement,  up to
and including four extension periods.
(3) Under the respective new employment  agreements,  the surviving  corporation
agrees to recommend to the  Compensation  Committee of the Board of Directors of
Quest  Diagnostics  for  fiscal  year  2006  that it  approve  and  grant to the
respective  employee an option to  purchase  the  specified  number of shares of
Quest Diagnostics.  The terms and conditions of the stock option shall be as set
forth in the Quest  Diagnostics  Employee Long Term  Incentive  Plan and a stock
option agreement to be entered into between Quest Diagnostics and the employee.
(4) Under the respective new employment  agreements,  the surviving  corporation
agrees to recommend to the  Compensation  Committee of the Board of Directors of
Quest  Diagnostics  for  fiscal  year  2006  that it  approve  and  grant to the
respective  employee  restricted stock of Quest Diagnostics having a fair market
value equal to the specified amount.  The terms and conditions of the restricted
stock  shall  be as set  forth  in the  Quest  Diagnostics  Employee  Long  Term
Incentive Plan and a restricted stock agreement to be entered into between Quest
Diagnostics and the employee.



                                       19


     The  terms of the new  employment  agreements  are:  three  years  from its
effective date for Messrs. Grant, Spencer,  Sadler and James, and two years from
its effective date for Mr. Asselta.  If the employment of any of Messrs.  Grant,
Spencer, Sadler or James under his new employment agreement is terminated due to
the employee's  death or  disability,  or by the surviving  corporation  without
cause,  the  surviving  corporation  will be required to pay to the employee his
earned and unpaid base  salary plus a lump sum payment  equal to $438,520 in the
case of Mr. Grant, $325,000 in the case of Mr. Spencer,  $676,878 in the case of
Mr. Sadler and $300,000 in the case of Dr.  James,  less in each case the amount
of his signing bonus and any special annual performance bonuses, if any, and the
value of any restricted stock awarded to him and vested at the termination.

     With respect to Mr. Asselta,  if his employment is terminated under his new
employment  agreement  due to  his  death  or  disability,  or by the  surviving
corporation without cause, the surviving corporation will be required to pay Mr.
Asselta  his earned and unpaid  base  salary  plus a lump sum  payment  equal to
$662,359,  less the amount of his signing bonus, any additional  bonuses for any
six-month extension, and any special annual performance bonuses, if any, and the
value  of  any  restricted  stock  awarded  to Mr.  Asselta  and  vested  at the
termination. Mr. Asselta may voluntarily resign upon sixty days notice following
the second anniversary of his new employment  agreement.  In the event of such a
resignation,  Mr. Asselta will be entitled to the same severance compensation as
described  above  with  respect to  termination  due to Mr.  Asselta's  death or
disability,  or by the surviving corporation without cause. If his employment is
terminated under his new employment  agreement for cause, he will be entitled to
the same  severance  compensation  as  described  above less any actual  damages
suffered by the surviving  corporation as a result of the behavior  constituting
cause, with certain exceptions.

     In the event of any change of control of Quest  Diagnostics  following  the
merger,  Messrs.  Grant, Spencer and Sadler will have certain rights under Quest
Diagnostics'  executive  severance  plan. Upon the expiration of the term of the
employee's  new  employment  agreement,  the  employee  will become an "at-will"
employee,  although  in the case of Messrs.  Grant,  Spencer and Sadler if he is
terminated  from employment  thereafter,  he will also have certain rights under
Quest Diagnostics' executive severance plan.

     Severance Payments. Under the terms of their employment agreements,  Joseph
C. Benage, our Executive Vice President, General Counsel and Secretary, and John
W. McCarty,  our Executive Vice President and Chief Financial  Officer,  will be
entitled to certain cash  severance  payments as a result of the merger.  If the
merger is consummated  before  November 17, 2005, Mr. Benage will be entitled to
$861,816.  If the merger is  consummated on or after November 17, 2005 and prior
to January 1, 2006, he will be entitled to receive  $871,136.  Mr.  McCarty will
receive  $963,108 if the closing of the merger  occurs at any time during  2005.
Due to the  operation  of the formula for  determining  the amount of  severance
payments under their employment agreements, the amount of the severance payments
payable to Messrs.  Benage and McCarty will change if the merger is  consummated
in 2006.

     Indemnification   and  Insurance.   Under  the  merger   agreement,   Quest
Diagnostics agrees that (a) the existing rights to indemnification of all of our
directors  and  officers  under our  articles of  incorporation  or bylaws shall
survive the merger and continue for a period of six years,  (b)  indemnification
agreements  between us and our directors and executive  officers shall remain in
full force and effect in accordance with their terms  following the merger,  (c)
subject to certain conditions, Quest Diagnostics will maintain in effect for six
years from the effective time of the merger  directors' and officers'  liability
insurance with respect to matters  existing or occurring  prior to the effective
time of the merger and (d) subject to certain conditions, Quest Diagnostics will
provide indemnification for a period of six years to persons who, at or prior to
the effective time, were officers or directors of us or any of our  subsidiaries
or served at our  request as a director,  officer,  employee or agent of another
corporation,  partnership, joint venture, trust or other enterprise. See "MERGER
AGREEMENT - Indemnification and Insurance."



                                       20


     Copies  of the new  employment  agreements  with  Messrs.  Grant,  Asselta,
Spencer,  Sadler and James were filed as  Exhibits  10.9 - 10.13 to our  Current
Report on Form 8-K filed with the Securities  and Exchange  Commission on August
8, 2005. See "WHERE YOU CAN FIND MORE INFORMATION."

Regulatory Approvals

     Under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended,
which we refer to as the HSR Act, and the rules  promulgated  thereunder  by the
Federal  Trade  Commission,  which we refer to as the FTC, the merger  cannot be
completed  until we and Quest  Diagnostics  file a notification  and report form
under  the HSR Act  and  the  applicable  waiting  period  has  expired  or been
terminated.  We and Quest Diagnostics filed  notification and report forms under
the HSR Act with the FTC and the Antitrust Division of the Department of Justice
on August  19,  2005.  At any time  before or after  completion  of the  merger,
notwithstanding  the expiration or early termination of the waiting period under
the HSR Act, the Antitrust  Division or the FTC could take such action under the
antitrust  laws as it deems  necessary  or  desirable  in the  public  interest,
including seeking to enjoin the completion of the merger or seeking  divestiture
of substantial  assets of us or Quest  Diagnostics.  At any time before or after
the  completion  of the merger,  and  notwithstanding  the  expiration  or early
termination  of the waiting  period under the HSR Act, any state could take such
action under the antitrust laws as it deems necessary or desirable in the public
interest.  Such action could  include  seeking to enjoin the  completion  of the
merger or seeking  divestiture of substantial assets of us or Quest Diagnostics.
Private  parties may also seek to take legal  action  under the  antitrust  laws
under certain circumstances.

     While there can be no assurance that the merger will not be challenged by a
governmental  authority  or private  party on  antitrust  grounds,  we and Quest
Diagnostics  believe that the merger can be effected in compliance  with federal
and  state  antitrust  laws.  Under  the terms of the  merger  agreement,  Quest
Diagnostics has agreed to use its reasonable best efforts to eliminate, avoid or
resolve any objection raised by any antitrust governmental  authority,  any suit
challenging  the merger  under any  antitrust  or  competition  law or any other
impediment to the merger under any anti-trust or competition law, so as to allow
the parties to consummate the merger as promptly as practicable,  subject to the
limitations described in the next paragraph.

     Under  the  merger  agreement,  Quest  Diagnostics  agreed to commit to and
effect as promptly as practicable,  by consent decree,  hold separate orders, or
otherwise,  the  sale,  divestiture  or  disposition  of  such  of its  and  its
affiliates'  assets or  operations,  and/or of the  assets or  operations  to be
acquired by it pursuant  to the merger,  as is required to be sold,  divested or
disposed of, including entering into any agreements  required to be entered into
by any governmental  authority in connection  therewith,  in order to obtain any
required  regulatory  approval  or to  avoid  the  commencement  of any  suit or
proceeding seeking or to avoid entry of any decree, order, judgment, injunction,
temporary  restraining  order or other  order  that  would  have the  effect  of
materially  delaying  or  prohibiting  the  consummation  of the  merger.  Quest
Diagnostics,  however, is not required to hold separate, sell, divest or dispose
of any  assets  or  operations  owned  by it or its  affiliates  or by us or our
affiliates,  which  individually or collectively  produced aggregate revenues in
calendar year 2004 in excess of the 2.5% of our  consolidated  revenues for 2004
(which amount is equal to $11.7  million),  or hold  separate,  sell,  divest or
dispose of any full service laboratory.

Certain U.S. Federal Income Tax Consequences

     The  following  is  a  discussion  of  certain  U.S.   federal  income  tax
consequences  of the merger to U.S.  holders (as defined below) of shares of our
common stock.  This  discussion  is based on current  provisions of the Internal
Revenue Code of 1986,  as amended  (which we refer to as the "Code"),  existing,
proposed   and   temporary   regulations   promulgated   thereunder,    rulings,
administrative  pronouncements  and judicial  decisions,  changes to which could
materially  affect the tax consequences  described herein and could be made on a
retroactive basis.

     For purposes of this  discussion,  we use the term "U.S.  holder" to mean a
U.S.  citizen or resident alien individual as defined in the Code, a corporation
or entity taxable as a corporation, created or organized in or under



                                       21


the laws of the U.S. or any state thereof or the District of Columbia, an estate
the income from which is includable in its gross income for U.S.  federal income
tax purposes  without regard to its source,  or a trust if either (A) both (1) a
U.S. court is able to exercise primary  supervision over the  administration  of
the trust and (2) one or more U.S.  persons have the authority to control all of
the substantial  decisions of the trust or (B) it has in effect a valid election
to be treated as a  domestic  trust for U.S.  federal  income  tax  purposes.  A
non-U.S. holder is any holder that is not a U.S. holder.

     This  discussion  assumes that you hold the shares of our common stock as a
capital  asset within the meaning of Section 1221 of the Code.  This  discussion
does not  address  all  aspects  of U.S.  federal  income  taxation  that may be
relevant to you in light of your particular circumstances,  or that may apply to
you if you are subject to special  treatment  under the U.S.  federal income tax
laws  (including,  for  example,  regulated  investment  companies,  persons who
mark-to-market   our  common  stock,  S  corporations,   partnerships  or  other
pass-through entities, dealers and certain traders in securities and currencies,
financial   institutions,   insurance  companies,   tax-exempt  entities,   U.S.
expatriates,  holders  that are not U.S.  holders,  investors  who  received our
common  stock upon  conversion  of  securities  or exercise of warrants or other
rights to acquire  common stock,  persons who hold our common stock as part of a
synthetic security, straddle, hedge, constructive sale, or a conversion or other
integrated  transaction,  persons that have a functional currency other than the
U.S. dollar,  persons who are subject to the alternative  minimum tax, investors
in a  pass-through  or similar  entity,  persons who  receive  our common  stock
through the exercise of employee stock options or otherwise as compensation,  or
if you do not hold our common stock as a capital asset).

THIS U.S. FEDERAL INCOME TAX DISCUSSION IS INCLUDED FOR GENERAL INFORMATION ONLY
AND MAY NOT ADDRESS ALL TAX  CONSIDERATIONS  THAT MAY BE SIGNIFICANT TO YOU. YOU
ARE URGED TO  CONSULT  YOUR TAX  ADVISOR  WITH  RESPECT  TO THE  PARTICULAR  TAX
CONSEQUENCES TO YOU OF THE MERGER, INCLUDING THE APPLICABILITY AND EFFECT OF ANY
STATE, LOCAL, FOREIGN OR OTHER TAX LAWS.

     The  receipt of cash in the merger by U.S.  holders of shares of our common
stock  generally  will be a taxable  transaction  for U.S.  federal  income  tax
purposes (and may also be a taxable  transaction under applicable  state,  local
and foreign tax laws). In general,  for U.S. federal income tax purposes, a U.S.
holder  of shares  of our  common  stock  will  recognize  gain or loss for U.S.
federal income tax purposes  equal to the  difference,  if any,  between (1) the
merger  consideration  received  in  exchange  for such  shares and (2) the U.S.
holder's  adjusted tax basis in such shares. If the holding period in our shares
surrendered  is greater than one year as of the date of the merger,  the gain or
loss will be long-term capital gain or loss. The deductibility of a capital loss
recognized on the exchange is subject to limitations.  If you acquired different
blocks of our stock at different times or different  prices,  you must determine
your tax basis and holding period  separately  with respect to each block of our
stock.

     There are  limitations  on the  deductibility  of capital  losses.  Capital
losses not  offset by  capital  gains may be  deducted  against a  non-corporate
stockholder's  ordinary income only up to a maximum annual amount of $3,000, and
non-corporate  stockholders may carry forward unused capital losses. A corporate
stockholder  can deduct  capital  losses  only to the  extent of capital  gains;
unused capital losses may be carried back three years and forward five years.

     Receipt of the merger consideration may also be a taxable transaction under
applicable state, local and foreign tax laws.

     Backup  withholding  at a rate of 28% will apply to all cash  received by a
shareholder  under the  merger,  unless  the  shareholder  provides  a  taxpayer
identification  number (social security number,  in the case of individuals,  or
employer  identification  number, in the case of other shareholders),  certifies
that  such  a  number  is  correct,  and  otherwise  complies  with  the  backup
withholding  tax rules.  Each of our  shareholders  should complete and sign the
Substitute  Form W-9 included as part of the letter of transmittal and return it
to the  paying  agent in order to  provide



                                       22


the information and  certification  necessary to avoid backup  withholding  tax,
unless an exemption  applies and is established in a manner  satisfactory to the
paying  agent.  Backup  withholding  is not an  additional  tax and any  amounts
withheld under the backup  withholding rules may be refunded or credited against
your U.S.  federal income tax liability,  if any,  provided that you furnish the
required  information to the Internal  Revenue  Service in a timely  manner.  In
addition,  certain  foreign  persons  such as  certain  nonresident  aliens  may
establish  an  exemption  from,  or a reduced  rate of,  backup  withholding  by
delivering the proper version of Form W-8.

     Because individual  circumstances may differ, you are encouraged to consult
your own tax advisor as to the particular tax consequences of the merger to you,
including  the  application  and effect of state,  local,  foreign and other tax
laws.

Dissenters' Rights

     Under  Missouri law,  holders of shares of our common stock are entitled to
dissenters'  rights in connection  with the merger.  Any holder of shares of our
common  stock at the time of the merger who does not vote in favor of the merger
may  elect to  receive  payment  of the  fair  value  of the  shares  in cash in
accordance with Section  351.455 of the General and Business  Corporation Law of
Missouri if the merger is consummated.  However, Quest Diagnostics may elect not
to consummate the merger if a demand for fair value of dissenting  shares of our
common stock has been perfected,  asserted or demanded with respect to more than
10% of the aggregate number of our outstanding shares of common stock.

     Any shareholder  contemplating  the exercise of the right to dissent should
review  carefully the  provisions of Section  351.455 set forth in Appendix C to
this proxy statement.  A summary of the principal steps to be taken if the right
to dissent is to be exercised is set forth below. This summary should be read in
conjunction  with,  and is qualified  in its entirety by reference  to, the full
text of Section 351.455.

EACH STEP MUST BE TAKEN IN STRICT  COMPLIANCE WITH THE APPLICABLE  PROVISIONS OF
SECTION  351.455 IN ORDER FOR  HOLDERS OF SHARES OF OUR COMMON  STOCK TO PERFECT
DISSENTERS' RIGHTS.

     Under Missouri  statutory  law, a shareholder  who dissents from the merger
may, in certain  circumstances and subject to certain  limitations (as described
below),  demand the fair value of his or her shares. A shareholder's  failure to
vote against the proposal to approve the merger  agreement  will not, by itself,
constitute a waiver or forfeiture by such  shareholder of his or her dissenter's
rights.  However,  in  order to  receive  the fair  value of those  shares,  the
dissenting shareholder must take certain steps to perfect his or her dissenter's
rights. In particular, the dissenting shareholder:

          o    must  file  with  us,  prior  to or at  the  special  meeting  of
               shareholders,  a written  objection  to the merger (if the shares
               were  held  by the  shareholder  as of the  record  date  for the
               special meeting);

          o    must not vote in favor of the merger;

          o    within 20 days  after  the  merger  is  effected,  make a written
               demand on the surviving corporation for payment of the fair value
               of his or her shares as of the day prior to the special  meeting;
               and

          o    must state, in such written  demand,  the number and class of the
               shares held by the dissenting shareholder.



                                       23


     Shareholders  will not receive any notice with respect to the expiration of
the 20 day period.  Any shareholder  failing to make a written demand within the
20 day period shall be conclusively presumed to have consented to the merger and
shall be  bound  by the  terms  thereof.  A vote  against  the  merger  does not
constitute a demand as required under the statute.  If, within 30 days after the
effective  date of the merger,  the fair value of the  dissenting  shareholder's
shares is agreed  upon  between the  dissenting  shareholder  and the  surviving
corporation,  payment for such shares must be made by the surviving  corporation
within 90 days after the effective date of the merger, upon the surrender of the
dissenting shareholder's stock certificates representing his or her shares. Upon
payment of the  agreed  value,  the  dissenting  shareholder  ceases to have any
interest in the shares or in the surviving corporation.

     If, within 30 days after the effective date of the merger, there is no such
agreement as to the fair value of the  dissenting  shareholder's  shares between
the dissenting  shareholder and the surviving  corporation,  then the dissenting
shareholder may, within 60 days after the expiration of the 30 day period,  file
a petition in any court of competent  jurisdiction  specified in Section 351.455
asking for a finding and determination of the fair value of his or her shares as
of the  day  prior  to the  special  meeting  of  shareholders.  The  dissenting
shareholder will be entitled to judgment  against the surviving  corporation for
an amount  equal to the fair value of his or her shares  measured  as of the day
prior to the special meeting,  together with interest thereon to the date of the
judgment.

     The  judgment  will  only be  payable  upon  and  simultaneously  with  the
surrender to the surviving  corporation of the stock  certificates  representing
the shares owned by the  dissenting  shareholder.  Upon payment of the judgment,
the  shareholder  will  cease  to have  any  interest  in the  shares  or in the
surviving  corporation.  Further,  unless the dissenting  shareholder  files the
petition  with the court  within the 60-day  time limit  described  above,  that
shareholder  and  all  persons   claiming  under  that   shareholder   shall  be
conclusively presumed to have approved or ratified the merger and shall be bound
by the terms thereof. The right of a dissenting  shareholder to be paid the fair
value of his or her shares as provided  above  ceases if and when we abandon the
merger.

Source of Funds

     The  obligation  of Quest  Diagnostics  to  consummate  the  merger  is not
conditioned  upon Quest  Diagnostics  obtaining  financing.  Approximately  $934
million will be required to pay the aggregate merger consideration for shares of
our common stock, to cash out outstanding stock options and to pay amounts to be
paid with respect to our debentures.  Quest  Diagnostics has informed us that it
presently  expects  to  fund  the  cash  requirements  for  the  merger  from  a
combination of available cash, borrowings under its existing credit facility and
the issuance of new debt securities.

Delisting and Deregistration of Our Common Stock

     If the merger is completed, our common stock will cease to be quoted on the
Nasdaq  National  Market,  will not be publicly  traded and will be deregistered
under the Securities Exchange Act of 1934, as amended.

Anticipated Accounting Treatment

     Quest Diagnostics has informed us that it intends to account for the merger
under the "purchase" method of accounting for financial accounting purposes.

Effect on LabOne Convertible Debentures

     Upon  consummation  of  the  merger,  the  holders  of the  Company's  3.5%
Convertible  Senior  Debentures  in the  aggregate  principal  amount  of $103.5
million will have the right to receive such principal  amount,  plus a specified
premium as a result of an increase of the conversion rate of the debentures,  in
an aggregate cash amount of approximately  $132 million.  In accordance with the
terms of the indenture for the debentures,  upon



                                       24


consummation  of the merger,  (a) the debentures may be converted,  the right to
receive cash and stock upon conversion will be changed into the right to receive
cash, and the conversion rate will be increased as provided in the indenture for
the debentures  and (b) holders of debentures  will have the right to require us
to repurchase  their  debentures  upon the terms and conditions set forth in the
indenture for the debentures.


                              THE MERGER AGREEMENT

     The  following  discussion  summarizes  certain  provisions  of the  merger
agreement.  This  summary may not contain all the  information  about the merger
agreement that is important to you. We strongly  encourage you to read carefully
the merger agreement in its entirety,  a copy of which is attached as Appendix A
to this proxy statement.

Effective Time

     We will file articles of merger with the Secretary of State of the State of
Missouri as soon as practicable on or after the closing date,  which will not be
later than the fifth business day after satisfaction or waiver of the conditions
to the  closing  of the  merger  as set  forth  in  Article  VIII of the  merger
agreement.  The merger will become  effective upon the issuance of a certificate
of merger by the Secretary of State of the State of Missouri.

Merger Consideration

     Each share of our common stock issued and outstanding  immediately prior to
the merger, at the effective time of the merger, will automatically be cancelled
and will be  converted  into the right to  receive  $43.90 in cash,  per  share,
without interest and subject to applicable tax withholding.  After the merger is
effective,  each holder of a certificate representing any of these shares of our
common  stock who does not exercise  dissenters'  rights will no longer have any
rights with  respect to the  shares,  except for the right to receive the merger
consideration.  Each share of our common stock held by us and any shares held by
Quest  Diagnostics  or  Fountain  at the time of the  merger  will be  cancelled
without any payment.

     Holders of shares of our common  stock are  entitled to assert  dissenters'
rights instead of receiving the merger consideration. For a description of these
dissenters' rights, please refer to "THE MERGER - Dissenters' Rights."

No Further Ownership Rights

     After the  effective  time of the  merger,  each of our  outstanding  stock
certificates  held by you will  represent  only the right to receive  the merger
consideration.  The merger consideration paid upon surrender of each certificate
will be paid in full  satisfaction of all rights pertaining to the shares of our
common stock represented by that certificate.

Conversion of Shares; Procedures for Exchange of Certificates

     Your  right to  receive  $43.90  per share in cash,  without  interest  and
subject to applicable tax withholding,  will occur automatically upon completion
of the  merger.  Prior  to the  effective  time  of the  merger,  Fountain  will
designate  a bank or trust  company  to act as paying  agent  under  the  merger
agreement. Immediately after the effective time of the merger, Quest Diagnostics
will deposit with the paying  agent cash in an amount  sufficient  to enable the
paying agent to pay the aggregate merger  consideration to the holders of shares
of our common stock.

     Promptly after the effective time of the merger, but in no event later than
three business days thereafter,  Fountain will cause to be mailed to each record
holder  of  shares  a  letter  of  transmittal  and   instructions  for  use  in
surrendering   certificates  in  exchange  for  the  merger  consideration.   No
shareholder should surrender any certificates until the shareholder receives the
letter of transmittal and other materials for such surrender.  Upon



                                       25


surrender of a stock certificate for cancellation to the paying agent,  together
with a letter of transmittal, duly completed and validly executed, the holder of
such certificate will be entitled to receive the merger consideration into which
the  number of  shares of common  stock  previously  represented  by such  stock
certificate(s)  shall have been  converted  pursuant  to the  merger  agreement,
without any interest thereon. The certificates so surrendered will be cancelled.

     In the event of a transfer of  ownership of shares of common stock which is
not registered in our transfer records, payment may be made with respect to such
shares to the transferee if the stock  certificate  representing  such shares is
presented to the paying agent,  accompanied by all documents reasonably required
by the  paying  agent  to  evidence  such  transfer  and to  evidence  that  any
applicable stock transfer taxes relating to such transfer have been paid.

     If your stock  certificate has been lost,  stolen or destroyed,  the paying
agent will deliver to you the  applicable  merger  consideration  for the shares
represented by that certificate if:

          o    you make an affidavit  claiming such  certificate  has been lost,
               stolen or destroyed; and

          o    if required by the surviving corporation, you post a bond in form
               and  substance  and with surety  reasonably  satisfactory  to the
               surviving corporation.

     Shareholders  should not send their  certificates  now and should send them
only  pursuant to  instructions  set forth in the letters of  transmittal  to be
mailed to shareholders  promptly after the effective time of the merger.  In all
cases,  the merger  consideration  will be provided only in accordance  with the
procedures set forth in this proxy statement and such letters of transmittal.

     At the  effective  time of the  merger,  our share  transfer  books will be
closed,  and there will be no further  registration  of transfers of outstanding
shares  of our  common  stock.  If,  after  the  effective  time of the  merger,
certificates are presented to the surviving  corporation or the paying agent for
transfer or any other  reason,  they will be  cancelled  and  exchanged  for the
merger consideration.

     None of the paying  agent,  Fountain or the surviving  corporation  will be
liable to any  person  for any  shares or cash  delivered  to a public  official
pursuant to any applicable  abandoned  property,  escheat or similar law. At any
time after the nine month  anniversary of the effective time of the merger,  the
surviving  corporation  may request the paying  agent to deliver to it any funds
made  available to the paying agent which have not been  disbursed to holders of
our  common  stock.  Any  shareholders  who have  not  complied  with the  above
described  procedures to receive payment of the merger consideration during such
nine month period may  thereafter  look only to the  surviving  corporation  and
Quest  Diagnostics  for  payment of the merger  consideration  to which they are
entitled.

Treatment of Outstanding Stock Options

     At the effective  time of the merger,  each  outstanding  stock option will
become fully vested and exercisable.  All stock options will be cancelled at the
effective time of the merger.  The holder of each stock option will generally be
entitled  to  receive,  in full  satisfaction  of the rights of such holder with
respect to such  stock  option,  an amount  for each share  subject to the stock
option equal to the excess of the merger  consideration of $43.90 per share over
the exercise price per share,  less any applicable tax  withholding.  Holders of
options under our 2001  Long-Term  Incentive Plan will be required to complete a
notice of exercise in order to receive the cash payable at the effective time of
the  merger.  All  amounts  payable  will be  paid at or as soon as  practicable
following the effective time of the merger,  without  interest.  As of August 8,
2005 there were outstanding  options to purchase  1,610,812 shares of our common
stock with an exercise  price per share that is less than $43.90,  the per share
merger consideration.



                                       26


Representations and Warranties

     The merger agreement contains various  representations and warranties by us
as of specific  dates.  The  statements  embodied in those  representations  and
warranties  were made only for  purposes  of the merger  agreement  among  Quest
Diagnostics,  Fountain and us, and are subject to important  qualifications  and
limitations agreed upon by such parties in connection with negotiating the terms
of the merger agreement.  In addition, the representations and warranties may be
subject to standards of materiality different from those generally applicable to
shareholders  and may have been made for the purpose of allocating  risk between
us and Quest  Diagnostics  rather than establishing the matters addressed in the
representations  and warranties as matters of fact.  All of the  representations
and  warranties  will  expire  at  the  effective  time  of  the  merger.  These
representations and warranties relate to, among other things:

          o    corporate organization and existence, good standing and corporate
               power to operate our businesses;

          o    our articles of incorporation and our bylaws;

          o    our capitalization;

          o    the authority and power to enter into the merger agreement and to
               consummate the transactions contemplated by the merger agreement;

          o    the  absence  of  certain  violations  of or  conflicts  with our
               organizational documents, applicable law or certain agreements as
               a result of entering into the merger  agreement and  consummating
               the merger;

          o    required  consents  and  approvals  of  governmental  entities in
               connection with the merger;

          o    compliance with laws and permits;

          o    reports and financial statements filed with the SEC;

          o    our internal  control over  financial  reporting  and  disclosure
               controls and procedures;

          o    the absence of certain  changes or events  since March 31,  2005,
               concerning  us and our  subsidiaries,  including the absence of a
               material  adverse  effect (as defined  under  "Conditions  to the
               Completion of the Merger" below);

          o    pending or threatened  litigation  and  outstanding  court orders
               against us;

          o    our compensation arrangements and benefit plans;

          o    employment and labor matters;

          o    the accuracy of information in this proxy statement;

          o    real property owned and leased by us;

          o    our intellectual property;

          o    tax matters;



                                       27


          o    environmental matters;

          o    the  inapplicability  of  our  rights  agreement  to  the  merger
               agreement and the merger;

          o    certain listed contracts;

          o    our insurance policies;

          o    transactions with our affiliates;

          o    our customers and suppliers;

          o    the absence of undisclosed broker's fees; and

          o    our receipt of a fairness opinion from JPMorgan.

     The merger agreement also contains  representations and warranties by Quest
Diagnostics  and  Fountain  that  are  subject,  in  some  cases,  to  specified
exceptions and  qualifications.  The  representations  and warranties relate to,
among other things:

          o    corporate organization and existence, good standing and corporate
               power to operate its businesses;

          o    the authority and power to enter into the merger agreement and to
               consummate the transactions contemplated by the merger agreement;

          o    the  absence  of  any   violation  of  or  conflict   with  their
               organizational documents, applicable law or certain agreements as
               a result of entering into the merger  agreement and  consummating
               the merger;

          o    required  consents and  approvals of  governmental  entities as a
               result of the merger;

          o    the accuracy and  completeness of information  they have supplied
               for inclusion in this proxy statement;

          o    the  sufficiency  as of  the  effective  time  of the  merger  of
               available  funds  to pay the  merger  consideration  and  amounts
               required to cash-out stock options;

          o    the absence of undisclosed broker's fees; and

          o    non-ownership  of our  capital  stock  by Quest  Diagnostics  and
               Fountain.

Conduct of Business Pending the Merger

     Under the merger agreement, we have agreed that prior to the effective time
of  the  merger,   subject  to  certain  exceptions,   unless  we  obtain  Quest
Diagnostics'  prior written agreement (which agreement shall not be unreasonably
withheld or delayed),  we will conduct our business in all material  respects in
the ordinary  course and consistent  with past practice,  and use our reasonable
best efforts to preserve substantially intact our business organization, to keep
available the services of our current officers,  employees and consultants,  and
to preserve  our  current  relationships  with  customers,  suppliers  and other
persons with which we have significant business relations.  In addition, we have
also  agreed  that until the  effective  time of the  merger,  unless  expressly
contemplated or set



                                       28


forth in the merger agreement (and the disclosure schedule incorporated therein)
or with Quest  Diagnostics'  prior written  consent  (which consent shall not be
unreasonably  withheld  or  delayed),  we will not,  among other  things,  do or
propose to do any of the following:

          o    amend or  otherwise  change  our  articles  of  incorporation  or
               bylaws;

          o    issue,  sell,  grant or  encumber  any  shares or  options of our
               capital stock, or any other ownership  interest in us (except for
               the  issuance  of  shares  of  common  stock  upon   exercise  of
               outstanding stock options or upon conversion of the debentures);

          o    sell, pledge or encumber any of our assets;

          o    authorize,  declare, set aside, make or pay any dividend or other
               distribution, payable in cash, stock, property or otherwise, with
               respect to our capital stock;

          o    reclassify,  combine,  split, subdivide or redeem, or purchase or
               otherwise  acquire,  directly or  indirectly,  any of our capital
               stock,  other than in  connection  with the  exercise of employee
               stock  options  or  the  purchase  of  stock  from  the  minority
               shareholders of one of our subsidiaries;

          o    acquire any business,  corporation,  partnership,  other business
               organization or any division thereof;

          o    incur,  repay,  assume or guarantee any indebtedness for borrowed
               money or issue any debt securities in excess of specified amounts
               and in the  ordinary  course  of  business  consistent  with past
               practice;

          o    enter into any contract or agreement  that  requires  payments in
               excess of specified amounts;

          o    make or authorize any capital  expenditures  with respect to 2005
               outside  of our 2005  capital  expenditures  budget  in excess of
               specified amounts, and make or authorize any capital expenditures
               with respect to 2006 in excess of specified amounts;

          o    increase the compensation or benefits of our directors,  officers
               or employees, except increases in the ordinary course of business
               and  consistent  with  past  practice  of  salaries  or  wages of
               employees who are not officers or directors;

          o    grant any severance or  termination  pay to any of our directors,
               officers, or employees;

          o    enter into any  employment  or  severance  agreement  (other than
               employment  offer  letters  which do not provide for severance on
               termination  provisions)  with any of our directors,  officers or
               employees;

          o    establish,  adopt  or amend  any  collective  bargaining,  bonus,
               compensation  or  stock  option  or  other  benefit  plan for our
               directors, officers or employees;

          o    change any of our accounting principles,  policies or procedures,
               other than as required by GAAP or applicable law;



                                       29


          o    make,  revoke  or  change  any  tax  election  or  method  of tax
               accounting,  settle any  material tax  liability,  consent to any
               material  tax  claim or  assessment,  or  waive  the  statute  of
               limitations for any material tax claim or assessment;

          o    pay,  discharge or satisfy any claim,  liability  or  obligation,
               other than in the ordinary course of business and consistent with
               past practice;

          o    amend  or  modify  in any  material  respect  or  consent  to the
               termination  of any listed  contract,  other than in the ordinary
               course of business and consistent with past practice;

          o    settle any material litigation;

          o    sell,  transfer,  or grant any license or sublicense with respect
               to any of our material  intellectual  property  other than in the
               ordinary course of business and consistent with past practice; or

          o    announce  an  intention,   enter  into  any  formal  or  informal
               agreement,  or  otherwise  make  a  commitment,  to do any of the
               foregoing.

Indemnification and Insurance

     Under the merger  agreement,  Quest  Diagnostics  agrees that the  existing
rights to indemnification of all of our directors or officers under our articles
of  incorporation  or bylaws shall survive the merger for a period of six years.
In  addition,  indemnification  agreements  between  us and  our  directors  and
executive  officers  shall  remain in full force and effect in  accordance  with
their terms following the merger.

     Quest  Diagnostics also agrees to maintain in effect for six years from the
effective time of the merger directors' and officers'  liability  insurance with
respect to matters  existing or  occurring  prior to the  effective  time of the
merger.  Quest Diagnostics may substitute policies of at least the same coverage
containing  terms and conditions that are not, in the aggregate,  less favorable
to any beneficiary thereof. Quest Diagnostics, however, shall not be required to
pay more than an amount equal to 300% of current annual  premiums paid by us for
such insurance.  If the amount of the premiums  necessary to maintain or procure
such  insurance  coverage  exceeds such maximum  amount,  Quest  Diagnostics  is
required to maintain or procure, for such six-year period, the most advantageous
policies of directors' and officers' insurance obtainable for a premium equal to
that maximum amount.

     In addition, under the merger agreement,  Quest Diagnostics is required for
six years from and after the effective time of the merger, to indemnify and hold
harmless (and release from any liability to the surviving  corporation or any of
their  respective  subsidiaries)  the persons who, at or prior to the  effective
time of the merger,  were officers or directors of us or any of our subsidiaries
or served at our  request as a director,  officer,  employee or agent of another
corporation,  partnership,  joint venture, trust or other enterprise against all
expenses  (including  reimbursement for reasonable fees and expenses incurred in
advance of the final  disposition of any action,  suit or  proceeding),  losses,
claims, damages,  judgments, fines and amounts paid in settlement to the fullest
extent permitted by the MGBCL as of the date of the merger  agreement  (assuming
the MGBCL were applicable).

No Solicitation by Us

     Subject  to the  exceptions  described  below,  we have  agreed to  certain
restrictions  on our ability to solicit,  negotiate  and enter into  acquisition
transactions  with third  parties.  We have agreed that we will not,  and agreed
that we will instruct and use our  reasonable  best efforts to cause our and our
subsidiaries'  directors,   officers,  employees,  agents,  advisors  and  other
representatives   (including  any  investment  banker,  attorney  or  accountant
retained by us or any subsidiary) not to, directly or indirectly:

                                       30


          o    solicit,  initiate or knowingly  encourage  (including  by way of
               furnishing  nonpublic  information),  or take any other action to
               knowingly facilitate, any inquiries or the making of any proposal
               or offer  (including  any proposal or offer to our  shareholders)
               that  constitutes,  or may reasonably be expected to lead to, any
               competing transaction,

          o    enter into or maintain or continue  discussions  or  negotiations
               with any person or entity in  furtherance of such inquiries or to
               obtain a proposal or offer for a competing transaction,

          o    agree to, approve, endorse or recommend any competing transaction
               or enter into any letter of intent or other  contract,  agreement
               or  commitment   contemplating  or  otherwise   relating  to  any
               competing transaction, or

          o    authorize or permit any of the  officers,  directors or employees
               of us or any  subsidiary,  or any  investment  banker,  financial
               advisor, attorney, accountant or other representative retained by
               us or any subsidiary, to take any such action.

      Subject to the exceptions described below, we have also agreed not to
withdraw or modify, or propose to withdraw or modify, in a manner adverse to
Quest Diagnostics or Fountain, the approval or recommendation of the merger
agreement or the merger by our board of directors.

      Notwithstanding these agreements, prior to obtaining shareholder approval
of the merger agreement, we may, in response to an unsolicited, written, bona
fide proposal or offer regarding a competing transaction, (a) furnish
information to the third party making the proposal or offer, and enter into and
conduct discussions and negotiations with such third party, regarding the
proposal or offer, and (b) release the third party from, or waive any provision
of, any confidentiality or standstill agreement to which it is a party to the
extent reasonably necessary to permit the third party to make and pursue the
proposal or offer, if, prior to doing so, our board of directors shall have:

          o    determined, in its good faith judgment (after having received the
               advice of its  financial  advisor and outside  legal counsel (who
               may be our regularly engaged  independent  legal counsel)),  that
               the proposal or offer  constitutes or may be reasonably  expected
               to lead to a superior proposal,

          o    determined,  in its good faith judgment after  consultation  with
               independent  legal  counsel  (that may be our  regularly  engaged
               independent  legal  counsel),  that a  failure  to  furnish  such
               information,  enter into such  discussions  and  negotiations  or
               release or waive such provisions  would be inconsistent  with its
               fiduciary duties to us or our shareholders under applicable law,

          o    provided prior written notice to Quest  Diagnostics of our intent
               to furnish  information to, or enter into  discussions  with, the
               third party, and

          o    obtained  from  the  third  party  an  executed   confidentiality
               agreement  on  terms  no  less  favorable  to us in all  material
               respects than those  contained in the  confidentiality  agreement
               with Quest Diagnostics, with certain exceptions.

     In  addition,  if our  board of  directors  determines,  in its good  faith
judgment (after having received the advice of its financial  advisor and outside
legal counsel (who may be our regularly  engaged  independent  legal  counsel)),
that an unsolicited,  written,  bona fide offer from a third party constitutes a
superior proposal,  then we may terminate the merger agreement and enter into an
agreement with the third party with respect to the superior proposal, if:

                                       31


          o    prior to doing so, our board of directors  shall have  determined
               in its good faith judgment after  consultation  with  independent
               legal counsel (who may be our regularly engaged independent legal
               counsel),  that a  failure  to take  any  such  action  would  be
               inconsistent  with its fiduciary duties to us or our shareholders
               under applicable law;

          o    prior to entering into an agreement for a superior  proposal,  we
               notify Quest  Diagnostics in writing at least three business days
               prior to doing so, of our intention to enter into the  agreement,
               specifying its material terms and  identifying  the person making
               the  superior  proposal,  and  Quest  Diagnostics  does not make,
               within   three   business   days  of  receipt   of  the   written
               notification,  an offer that our board of directors determines in
               good faith (after  having  received  the advice of its  financial
               advisor  and  outside  legal  counsel  (who may be our  regularly
               engaged independent legal counsel)) is at least as favorable from
               a financial  point of view to our  shareholders  as the  superior
               proposal; and

o              we pay a $26.5 million termination fee to Quest Diagnostics
               simultaneous with termination of the merger agreement.

     In  addition,  subject to  termination  fee  requirements  described  under
"--Termination  Fees and  Expenses",  our  board of  directors  may  change  its
recommendation  regarding the merger  agreement and the merger if it determines,
in its good faith judgment after  consultation  with  independent  legal counsel
(who  may be our  regularly  engaged  independent  legal  counsel),  that  to do
otherwise  would  be  inconsistent  with  its  fiduciary  duties  to us  or  our
shareholders under applicable law.

     A "competing  transaction" is defined in the merger agreement as any of the
following: (i) any merger, consolidation,  share exchange, business combination,
recapitalization,   liquidation,   dissolution  or  other  similar   transaction
involving us; (ii) any sale, lease,  exchange,  transfer or other disposition of
all of our consolidated  assets,  or a portion thereof having an aggregate value
equal to 15% or more of our market  capitalization  or generating 15% or more of
our consolidated  revenue for the fiscal year ended December 31, 2004; (iii) any
sale, exchange, transfer or other disposition of 15% or more of any class of our
equity  securities;  or (iv)  any  tender  offer  or  exchange  offer  that,  if
consummated,  would result in any person  beneficially owning 15% or more of any
class of our equity securities.

     A "superior  proposal" is defined in the merger agreement as an unsolicited
written  bona fide  offer  made by a third  party to  consummate  any  competing
transaction  (i) that is on terms that our board of directors  determines in its
good faith judgment  (after  consultation  with its financial  advisor and after
taking  into  account  all  the  terms  and   conditions  of  the   contemplated
transaction)  are more  favorable  to our  shareholders  (in their  capacity  as
shareholders)  from a financial point of view than the merger agreement  (taking
into account any  alterations to that merger  agreement  agreed to in writing by
Quest Diagnostics in response thereto in accordance with the merger  agreement),
(ii) that is not  conditioned  upon receipt of requisite  financing or for which
financing, to the extent required, is then committed and (iii) that our board of
directors  determines in its good faith (after  consultation  with its financial
advisor and outside legal counsel (who may be our regularly engaged  independent
legal  counsel)) is  reasonably  capable of being  consummated;  except that for
purposes of this  definition  the reference to "15%" in clauses (ii),  (iii) and
(iv)  of the  definition  of  competing  transaction  shall  be  deemed  to be a
reference to "50%."

Employee Benefits

     Under the merger agreement, Quest Diagnostics has agreed that, for a period
of one year after the merger,  it will honor (without  modification  in a manner
adverse to the participants  therein) all of our and our subsidiaries'  existing
employee contracts, agreements,  arrangements,  policies, plans and commitments,
excluding any requirement that contributions be paid in employer stock; provided
that Quest  Diagnostics  may transfer  some or all of our and our  subsidiaries'
employees to the applicable  employee benefit  arrangements of Quest Diagnostics
and

                                       32


its subsidiaries  during the one-year  period,  as long as the employees who are
transferred  receive benefits under the arrangements that are not less favorable
than the benefits provided to similarly  situated employees of Quest Diagnostics
and its subsidiaries.

     Under  the  merger  agreement,  our and our  subsidiaries'  employees  will
receive  credit for  service  accrued  prior to the merger (a) for  purposes  of
eligibility to participate and vesting (but not for benefit  accruals) under the
employee benefit arrangements of Quest Diagnostics and its subsidiaries that may
be extended to the employees, except as may cause a duplication of benefits, and
(b) for  purposes of  determining  the level of benefits  under any  vacation or
severance  plan  following  the  merger   established  or  maintained  by  Quest
Diagnostics or any of its subsidiaries that is extended to the employees.  Quest
Diagnostics  and its  subsidiaries  have  agreed  to waive  any  limitations  on
benefits  relating  to any  pre-existing  conditions  to the  same  extent  such
limitations  are waived under any comparable  plan of Quest  Diagnostics and its
subsidiaries and to recognize, for purposes of annual deductible, co-payment and
out-of-pocket limits under its medical and dental plans, deductible,  co-payment
and out-of-pocket  expenses paid by our and our  subsidiaries'  employees in the
respective plan year in which the merger occurs.  The merger agreement  provides
that following the merger,  all of our and our subsidiaries'  employees shall be
entitled to all unused  vacation  time accrued as of the  effective  time of the
merger.

Other Covenants

     The  merger  agreement  contains  a number  of other  covenants,  including
covenants:

          o    requiring us to hold a special  meeting and to use our reasonable
               best  efforts  to  obtain  shareholder  approval  of  the  merger
               agreement, subject to the provisions of the merger agreement;

          o    governing   the   parties'   obligations   with  respect  to  the
               preparation   and  filing  with  the   Securities   and  Exchange
               Commission of this proxy statement;

          o    requiring  us to provide  Quest  Diagnostics  and  Fountain  with
               reasonable  access  during normal  business  hours to our and our
               subsidiaries' officers,  employees, agents, properties,  offices,
               plants  and other  facilities,  books  and  records,  subject  to
               certain exceptions;

          o    requiring  the  parties to give  prompt  notice of  matters  that
               reasonably  could be  expected  to cause  any  representation  or
               warranty  contained  in the  merger  agreement  to be  untrue  or
               inaccurate in any material  respect,  of any failure of any party
               to comply with any covenant under the merger agreement and of any
               other material development relating to us or our subsidiaries;

          o    requiring  the parties to use their  reasonable  best  efforts to
               obtain all  consents or  approvals  required  from third  parties
               other than  governmental  authorities  in order to consummate the
               merger as promptly as practicable;

          o    requiring  Quest  Diagnostics  to cause  Fountain  to perform its
               obligations  under the merger  agreement  and to  consummate  the
               merger and to  unconditionally  guarantee  the full and  complete
               performance  by Fountain and the surviving  corporation  of their
               obligations under the merger agreement; and

          o    requiring  the parties to use their  reasonable  best  efforts to
               consult  with each  other  before  issuing  any press  release or
               otherwise making any public statements with respect to the merger
               agreement or the merger.

                                       33


Conditions to the Completion of the Merger

     Our, Quest Diagnostics' and Fountain's respective obligations to consummate
the merger are subject to the satisfaction of the following conditions:

          o    approval  of  the  merger   agreement  by  our   shareholders  in
               accordance with Missouri law and our articles of incorporation;

          o    the expiration or termination of the waiting period under the HSR
               Act; and

          o    the absence of any law,  rule,  injunction,  judgment,  decree or
               order prohibiting the merger.

     In addition, we are not obligated to effect the merger unless the following
conditions have been satisfied or waived in writing:

          o    the  representations  and  warranties  of Quest  Diagnostics  and
               Fountain set forth in the merger  agreement that are qualified as
               to materiality  must be true and correct,  and those that are not
               so qualified  must be true and correct in all material  respects,
               in each case as of the date of the merger agreement and as of the
               effective  time  of the  merger  (except  that  the  accuracy  of
               representations  and warranties that by their terms speak as of a
               specified date will be determined as of such date);  except where
               any failure of such representations and warranties to be true and
               correct,  individually or in the aggregate, would not prohibit or
               materially  delay the consummation of the merger or prevent Quest
               Diagnostics or Fountain from performing their  obligations  under
               the merger agreement;

          o    Quest  Diagnostics'  and Fountain's  representation  and warranty
               that  Quest  Diagnostics  will  have  sufficient  funds as of the
               effective  time of the merger to consummate the merger and to pay
               the  merger   consideration  and  amounts  required  to  cash-out
               outstanding  stock  options  must be true and  correct  as of the
               effective time of the merger;

          o    Quest Diagnostics and Fountain must have complied in all material
               respects  with all of their  covenants and  agreements  under the
               merger  agreement to be complied with prior to the effective time
               of the merger; and

          o    Quest  Diagnostics  and  Fountain  must  have  delivered  to us a
               certificate dated as of the closing date of the merger and signed
               by a duly  authorized  officer  certifying that the conditions in
               the three preceding bullet points have been satisfied.

     In addition,  Quest  Diagnostics and Fountain are not obligated to complete
the merger unless the following conditions are satisfied or waived in writing:

          o    the  representations and warranties by us set forth in the merger
               agreement  that  are  qualified  as to  materiality  or  material
               adverse  effect must be true and correct,  and those that are not
               so qualified  must be true and correct in all material  respects,
               in each case as of the date of the merger agreement and as of the
               effective  time  of the  merger  (except  that  the  accuracy  of
               representations  and warranties that by their terms speak as of a
               specified date will be determined as of such date);  except where
               any failure of such representations and warranties to be true and
               correct, either individually or in the aggregate,  would not have
               a material adverse effect;

                                       34


          o    we must have  complied in all material  respects  with all of our
               covenants  and  agreements  under  the  merger  agreement  to  be
               complied with prior to the effective time of the merger;

          o    we must  have  delivered  to Quest  Diagnostics  and  Fountain  a
               certificate dated as of the closing date of the merger and signed
               by a duly  authorized  officer  certifying that the conditions in
               the two preceding bullet points have been satisfied; and

          o    a demand for fair value of dissenting  shares of our common stock
               must not have been  perfected,  asserted or demanded with respect
               to more  than  10% of the  aggregate  number  of our  outstanding
               shares of common stock.

      The merger agreement provides that a "material adverse effect" means any
event, circumstance or change that, individually or in the aggregate with all
other events, circumstances or changes, has, or is reasonably likely to (i) have
a materially adverse effect on our business, condition (financial or otherwise)
or results of operations, or (ii) prevent or materially delay our ability to
consummate the transactions contemplated by the merger agreement; except that
the definition of "material adverse effect" shall not include any event,
circumstance, change or effect resulting from or relating to (A) changes in
general U.S. economic conditions or changes in the general economic conditions
in the geographic areas in which we operate, so long as in any such case we are
not materially disproportionately affected relative to other entities that
operate in such geographic areas, (B) changes affecting the industries within
which we operate, so long as in any such case we are not materially
disproportionately affected relative to other industry participants, (C) changes
in any applicable law, (D) the execution or public announcement of the merger
agreement or the transactions contemplated hereby, (E) actions expressly
required to be taken us pursuant to the terms of the merger agreement, or (F)
any act of terrorism or war (whether or not threatened, pending or declared).

Termination

     Quest  Diagnostics and we can terminate the merger  agreement under certain
circumstances, including:

          o    by mutual written consent of Quest Diagnostics and us;

          o    by either  Quest  Diagnostics  or us, if the  merger has not been
               completed by April 7, 2006 for any reason, except that if (1) the
               merger is not  completed by April 7, 2006 because all  applicable
               waiting  periods  under  the HSR Act  have  not  expired  or been
               terminated   or  because  an  order   (other  than  a  final  and
               nonappealable order) has been entered by a governmental authority
               which  enjoins  completion  of the  merger,  and  (2)  all  other
               conditions  to the  merger  have been  satisfied,  the  permitted
               termination  date may be extended  until August 8, 2006 by either
               Quest  Diagnostics  or us, as long as the failure to complete the
               merger was not caused by the failure of Quest  Diagnostics or us,
               as the case may be, to fulfill  any  obligation  under the merger
               agreement.

          o    by either Quest  Diagnostics or us if any governmental  authority
               shall have enacted, issued, promulgated,  enforced or entered any
               law or order prohibiting completion of the merger, and such order
               shall have become final and nonappealable;

          o    by Quest  Diagnostics,  in the  event of any  breach by us of any
               representation,   warranty  or  covenant  that  would  cause  any
               condition to Quest Diagnostics' obligation to complete the merger
               to not be satisfied,  which breach, if capable of cure, shall not
               have been  cured  within  ten  business  days of receipt by us of
               written notice from Quest Diagnostics specifying such breach;

                                       35


          o    by us,  in the  event  of any  breach  by  Quest  Diagnostics  or
               Fountain of any  representation,  warranty or covenant that would
               cause any  condition to our  obligation to complete the merger to
               not be  satisfied,  which breach,  if capable of cure,  shall not
               have been  cured  within  ten  business  days of receipt by Quest
               Diagnostics or Fountain, as applicable, of written notice from us
               specifying such breach;

          o    by Quest  Diagnostics  if,  at any time  prior to the date of our
               special meeting, our board of directors shall have (i) effected a
               change in its  recommendation (as defined below) or (ii) approved
               or  recommended,   or  proposed  to  approve  or  recommend,  any
               competing transaction;

          o    by Quest  Diagnostics  or us if, upon a vote taken at the special
               meeting or any  postponement  or adjournment of the meeting,  the
               merger  agreement  is not  approved  by the  holders  of at least
               two-thirds of outstanding  shares of our common stock entitled to
               vote thereon; or

          o    by us, at any time prior to obtaining shareholder approval of the
               merger agreement,  in order to enter into a definitive  agreement
               with respect to a superior proposal in accordance with the merger
               agreement and payment of a termination fee of $26.5 million.

     As  defined  in the merger  agreement,  a change in company  recommendation
means  that  either  our board of  directors  or any  committee  of our board of
directors  shall have withdrawn or modified,  or proposed to withdraw or modify,
in  a  manner  adverse  to  Quest  Diagnostics  or  Fountain,  the  approval  or
recommendation  by our board of  directors  or any such  committee of the merger
agreement or the merger.

     In  the  event  of  the  termination  of  the  merger  agreement  by  Quest
Diagnostics or us, the merger agreement shall become void, and there shall be no
liability  on the part of any  party or their  respective  officers,  directors,
employees,  agents,  advisors  or  other  representatives,  except  that (a) the
confidentiality  agreement,  the termination  provisions in the merger agreement
and the general  provisions in Article X of the merger  agreement  shall survive
termination  and (b)  termination  shall not relieve any party from liability or
damages  arising out of any intentional or willful breach of any covenant in the
merger agreement prior to termination.

Termination Fees and Expenses.

     Except as described below, the merger agreement provides that regardless of
whether the merger is consummated, all costs and expenses incurred in connection
with the merger  agreement  and the merger  will be paid by the party  incurring
such costs and expenses.

     The merger agreement requires that we pay Quest Diagnostics a $26.5 million
termination fee if:

          1.   (a) Quest Diagnostics terminates the merger agreement because our
               board of  directors  shall have  effected a change in the company
               recommendation prior to the date of the special meeting, and

               (b) we enter into a definitive agreement,  within 12 months after
               such  termination,  relating to a competing  transaction and such
               transaction is thereafter consummated; or

          2.   (a)  Quest  Diagnostics  or we  terminate  the  merger  agreement
               because,  upon  a  vote  taken  at  the  special  meeting  or any
               postponement  or adjournment of the special  meeting,  the merger
               agreement is not  approved by the holders of at least  two-thirds
               of  outstanding  shares  of our  common  stock  entitled  to vote
               thereon,

               (b)  prior  to  the  vote  by  our  shareholders  on  the  merger
               agreement,  a  competing  transaction  shall  have been  publicly
               announced  and not  withdrawn,  or shall  have  otherwise  become
               publicly known after the date of the merger agreement, and

                                       36


               (c) we enter into a definitive agreement,  within 12 months after
               such  termination,  relating to a competing  transaction and such
               transaction is thereafter consummated; or

          3.   we  terminate  the  merger  agreement  in order  to enter  into a
               definitive  agreement  with  respect  to a superior  proposal  in
               accordance with the merger agreement; or

          4.   Quest  Diagnostics  terminates the merger agreement because prior
               to the date of the special  meeting our board of directors  shall
               have  approved  or   recommended,   or  proposed  to  approve  or
               recommend, any competing transaction.

     The merger agreement also requires that we reimburse Quest  Diagnostics for
reasonable out-of-pocket expenses, up to a maximum of $3.5 million,  incurred by
it or on its  behalf  in  connection  with  or  related  to  the  authorization,
preparation,  negotiation,  execution and performance of the merger agreement or
related to the merger if:

          A.   Quest Diagnostics  terminates the merger agreement as a result of
               any breach by us of any  representation,  warranty or covenant in
               the merger  agreement  that would  cause any  condition  to Quest
               Diagnostics'   obligation  to  complete  the  merger  to  not  be
               satisfied,  which breach, if capable of cure, shall not have been
               cured within ten business days of receipt by us of written notice
               from Quest Diagnostics specifying such breach; or

          B.   Quest  Diagnostics  terminates the merger  agreement  because our
               board of  directors  shall have  effected a change in the company
               recommendation prior to the date of the special meeting.

     The termination fee payable pursuant to Item 1 above will be reduced by the
amount of any  expenses of Quest  Diagnostics  required to be  reimbursed  by us
under the merger agreement.

     The merger agreement provides that payment of fees and expenses as required
in the merger  agreement  shall not be in lieu of any  damages  incurred  in the
event of a willful  breach or  intentional  breach of any covenant in the merger
agreement prior to such termination.

Amendment and Waiver

     Any provision of the merger agreement may be amended, modified or waived in
writing by the parties to the  agreement,  by action taken by or  authorized  by
each party's board of directors,  provided  that only  amendments  allowed under
applicable  law are  permitted  after the merger  agreement  is  approved by the
shareholders.

                                       37



                           MARKET PRICES AND DIVIDENDS

     Our common stock is listed on the Nasdaq  National  Market under the symbol
"LABS." On August 5, 2005, the last trading day before our announcement  that we
had signed the merger  agreement,  the last reported sale price per share of our
common stock on the Nasdaq  National  Market was $37.64.  On  __________,  2005,
there were approximately ________ holders of record of our common stock.

     The following table sets forth the high and low prices for our common stock
for the periods indicated, as reported by the Nasdaq National Market.


                                          High           Low
                                          ----           ---
2003      First Quarter..............  $   20.86     $   17.38
          Second Quarter.............  $   22.55     $   17.79
          Third Quarter..............  $   25.24     $   19.91
          Fourth Quarter.............  $   32.50     $   21.04

2004      First Quarter..............  $   36.24     $   27.42
          Second Quarter.............  $   34.14     $   27.87
          Third Quarter..............  $   32.47     $   26.27
          Fourth Quarter.............  $   33.00     $   28.81

2005      First Quarter..............  $   36.63     $   30.98
          Second Quarter ............  $   40.20     $   33.54
          Third Quarter .............  $             $
           (through ________, 2005)


We did  not pay  dividends  on our  common  stock  during  2005,  2004 or  2003.
Additionally,  our senior credit  facility  includes a covenant  restricting the
payment of dividends on our common stock.



                    SECURITY OWNERSHIP OF CERTAIN BENEFICIAL
                              OWNERS AND MANAGEMENT

     Principal  Shareholders.  The following  table lists any person who, to our
knowledge,  was the beneficial  owner,  as of August 1, 2005, of more than 5% of
our outstanding shares of common stock.

                                          Shares       Percentage of Outstanding
                                       Beneficially          Common Stock
Beneficial Owner                           Owned          Beneficially Owned
----------------                           -----          ------------------
AXA Financial, Inc.                    1,385,740(1)              8.1%
1920 Avenue of the Americas
New York, NY 10104

T. Rowe Price Associates, Inc.         1,260,154(2)              7.3%
100 E. Pratt Street
Baltimore, MD 21202

                                       38


St. Denis J. Villere & Company,        1,070,108(3)              6.2%
L.L.C.
Suite 808
210 Baronne Street
New Orleans, LA 70112-1727

---------------------------------
(1) According to the Schedule 13G filed by the reporting  person on February 14,
2005, the reporting person has sole voting power with respect to 792,700 shares,
shared  voting  power with  respect to 490,800 and sole  dispositive  power with
respect to all  1,385,740  shares.  The Schedule 13G also stated that the shares
are held by the reporting person's subsidiaries Alliance Capital Management L.P.
and AXA Equitable Life Insurance Company,  with Alliance Capital Management L.P.
having sole voting power with  respect to 652,740  shares,  shared  voting power
with  respect  to  490,800  shares and sole  dispositive  power with  respect to
1,245,780  shares,  and AXA Equitable Life Insurance  Company having sole voting
and dispositive power with respect to 139,960 shares. The Schedule 13G was filed
jointly by AXA Financial, Inc., AXA Assurances I.A.R.D. Mutuelle, AXA Assurances
Vie Mutuelle, AXA Courtage Assurance Mutuelle, and AXA.

(2) According to the Schedule 13G filed by the reporting  person on February 14,
2005, the reporting  person has sole voting power with respect to 197,582 shares
and sole dispositive power with respect to all 1,260,154  shares.  The reporting
person indicates that (i) these  securities are owned by various  individual and
institutional  investors  to which the  reporting  person  serves as  investment
adviser  with  power  to  direct  investments  and/or  sole  power  to vote  the
securities and (ii) for purposes of the reporting requirements of the Securities
Exchange Act of 1934, the reporting person is deemed to be a beneficial owner of
such securities;  however,  the reporting person expressly disclaims that it is,
in fact, the beneficial owner of such securities.

(3) According to the Schedule 13G filed by the reporting  person on February 28,
2005, the reporting person has sole voting and dispositive power with respect to
3,700 shares and shared voting and  dispositive  power with respect to 1,066,408
shares.

     Management. The following table sets forth information as of August 1, 2005
regarding the shares of our common stock  beneficially  owned by each  director,
our chief executive officer and our four other most highly compensated executive
officers  with  total  cash  compensation  exceeding  $100,000  during  our last
completed fiscal year, and all directors and executive officers as a group.

                                        Shares        Percentage of Outstanding
                                     Beneficially            Common Stock
Beneficial Owner                        Owned(1),(2)    Beneficially Owned(3)
----------------                        ------          ------------------   
W. Thomas Grant, II                   398,640(4),(5)       2.28%

John W. McCarty                       78,138               *

Michael J. Asselta                    72,603(4)            *

L. Patrick James                      7,398(4)             *

Joseph C. Benage                      83,434(4)            *

James R. Seward                       43,144               *

Jill L. Force                         2,136                *

John E. Walker                        28,248(6)            *

John P. Mascotte                      5,358                *

Lawrence N. Kugelman                  326                  *

                                       39


All directors and executive           841,417              4.81%
officers as a group (14 persons)
-----------------------------------
* Less than 1% of outstanding shares.

1. Unless otherwise indicated, each person has sole voting and investment power
with respect to the shares listed.

2. Includes the following numbers of shares which such persons have the right to
acquire  within 60 days after August 1, 2005  pursuant to options  granted under
LabOne's  Long-Term  Incentive and Bonus Replacement  Plans: W. Thomas Grant II,
274,955  shares;  Michael J. Asselta,  69,000  shares;  John W. McCarty,  71,269
shares;  Joseph C. Benage,  81,517 shares; L. Patrick James, 7,000 shares; James
R. Seward,  5,788  shares;  Jill L. Force,  550 shares;  John E.  Walker,  6,478
shares; John P. Mascotte, 4,053 shares; and all directors and executive officers
as a group, 623,329 shares.

3. For purposes of determining this percentage, the outstanding shares of LabOne
include  shares  which such persons have the right to acquire as of or within 60
days after August 1, 2005.

4.  Includes  the  following  numbers  of  shares  held as of  August 1, 2005 in
individually  directed  accounts  of the named  persons  under  LabOne's  401(k)
profit-sharing  plan, as to which each of such persons has sole investment power
only: W. Thomas Grant II, 27,881 shares;  Michael J. Asselta,  3,603;  Joseph C.
Benage 935 shares; L. Patrick James, 398 shares; and all directors and executive
officers as a group, 41,278 shares.

5.  Includes  63,462  shares held in a family trust for which W. Thomas Grant II
serves as co-trustee and in that capacity  shares voting and investment  powers,
13,763  shares owned by a son of W. Thomas  Grant II who lives in the home,  and
4,007  shares  owned by the wife of W. Thomas Grant II, as to which he disclaims
beneficial ownership.

6. Includes  20,482 shares owned by a revocable  trust for Mr. Walker's wife, as
to which he disclaims beneficial ownership.


                              SHAREHOLDER PROPOSALS

     We will not hold an annual meeting of shareholders in 2006 if the merger is
completed.  However,  if the merger is not  completed by then,  we will hold our
2006 annual meeting.

     If we hold our 2006 annual meeting,  shareholder nominations of persons for
election as directors or other  proposals may be brought  before the 2006 annual
meeting of shareholders  only by  shareholders  entitled to vote at such meeting
who give timely  written  notice  thereof in  compliance  with Article VI of our
by-laws,  which notice must be delivered to our  Secretary on the earlier of (a)
90 days prior to the date of such  meeting or (b) if we do not  provide at least
100 days' prior notice or public  announcement of the date of such meeting,  the
shareholder  notice must be  delivered to the  Secretary  not more than ten days
following the mailing date of the notice or public  announcement  of the date of
the meeting.

     If we hold our 2006 annual  meeting,  to be considered for inclusion in the
proxy  statement  and proxy for the 2006  annual  meeting of  shareholders,  any
shareholder  proposal must be received at our  corporate  office by December 20,
2005.


                       WHERE YOU CAN FIND MORE INFORMATION

     We file annual,  quarterly and current reports,  proxy statements and other
information  with the  Securities  and Exchange  Commission.  The annual reports
include our audited  financial  statements and the quarterly reports include our
unaudited financial statements. You may read and copy any reports, statements or
other  information  that we file at the SEC's public  reference  room,  which is
located at Room 1024, Judiciary Plaza, 450 Fifth Street, N.W., Washington,  D.C.
20549.  Shareholders  may  obtain  information  on the  operation  of the public
reference


                                       40


room by calling the SEC at  1-800-SEC-0330.  Copies of such  materials  are also
available  from the public  reference  section  of the SEC at 450 Fifth  Street,
N.W.,  Washington,  D.C. 20549 at prescribed rates. Copies of such materials may
also be accessed through the SEC's Internet web site at http://www.sec.gov. Once
the  merger  is  completed,  we will  no  longer  be  subject  to the  reporting
requirements of the Securities Exchange Act of 1934.

     You should rely only on the  information  contained in this proxy statement
to vote your  shares of our common  stock at the  special  meeting.  Neither us,
Quest  Diagnostics  nor  Fountain  has  authorized  anyone to  provide  you with
information that is different from what is contained in this proxy statement.

     This proxy  statement is dated  ________,  2005. You should not assume that
the  information  contained  in this proxy  statement is accurate as of any date
other than such date  (except  as  otherwise  expressly  provided  herein),  and
mailing of this proxy statement to shareholders  will not create any implication
to the contrary.

     All  information  contained  in this  proxy  statement  relating  to  Quest
Diagnostics and Fountain, Inc. has been provided by Quest Diagnostics.

     If you  would  like  additional  copies,  without  charge,  of  this  proxy
statement  or if you  have  more  questions  about  the  merger,  including  the
procedures for voting your shares, you should contact:

                  D. F. King & Co., Inc.
                  48 Wall Street
                  New York, New York 10005
                  (212) 269-5550 - Banks and Brokers (collect calls)
                  (888) 567-1626 - All others (toll-free)



                                       41

                                                                      Appendix A

================================================================================




                          AGREEMENT AND PLAN OF MERGER

                                      among

                         QUEST DIAGNOSTICS INCORPORATED,

                                 FOUNTAIN, INC.

                                       and

                                  LABONE, INC.



                           Dated as of August 8, 2005



================================================================================




                                Table of Contents


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                                    ARTICLE I
                                   DEFINITIONS

SECTION 1.01 Definitions.....................................................1

                                   ARTICLE II
                                   THE MERGER

SECTION 2.01 The Merger......................................................7
SECTION 2.02 Effective Time; Closing.........................................7
SECTION 2.03 Effect of the Merger............................................7
SECTION 2.04 Articles of Incorporation; Bylaws...............................7
SECTION 2.05 Directors and Officers..........................................7

                                   ARTICLE III
                            CONVERSION OF SECURITIES

SECTION 3.01 Conversion of Securities........................................8
SECTION 3.02 Employee Stock Options..........................................8
SECTION 3.03 Dissent Rights..................................................9
SECTION 3.04 Surrender of Shares; Stock Transfer Books.......................9
SECTION 3.05 Withholding Rights.............................................11

                                   ARTICLE IV
                REPRESENTATIONS AND WARRANTIES OF THE COMPANY

SECTION 4.01 Organization and Qualification; Subsidiaries...................11
SECTION 4.02 Articles of Incorporation and Bylaws...........................11
SECTION 4.03 Capitalization.................................................12
SECTION 4.04 Authority Relative to this Agreement...........................13
SECTION 4.05 No Conflict; Required Filings and Consents.....................14
SECTION 4.06 Permits; Compliance............................................15
SECTION 4.07 SEC Filings; Financial Statements..............................16
SECTION 4.08 Absence of Certain Changes or Events...........................18
SECTION 4.09 Absence of Litigation..........................................18
SECTION 4.10 Employee Benefit Plans.........................................18
SECTION 4.11 Labor and Employment Matters...................................20
SECTION 4.12 Information Supplied...........................................20
SECTION 4.13 Real Property; Title to Assets.................................21
SECTION 4.14 Intellectual Property..........................................22
SECTION 4.15 Taxes..........................................................22
SECTION 4.16 Environmental Matters..........................................23



SECTION 4.17 Rights Agreement...............................................24
SECTION 4.18 Listed Contracts...............................................24
SECTION 4.19 Insurance......................................................25
SECTION 4.20 Interested Party Transactions..................................26
SECTION 4.21 Customers and Suppliers........................................26
SECTION 4.22 Brokers........................................................26
SECTION 4.23 Opinion of Financial Advisor...................................26

                                    ARTICLE V
             REPRESENTATIONS AND WARRANTIES OF PARENT AND PURCHASER

SECTION 5.01 Corporate Organization.........................................27
SECTION 5.02 Authority Relative to This Agreement...........................27
SECTION 5.03 No Conflict; Required Filings and Consents.....................27
SECTION 5.04 Information Supplied...........................................28
SECTION 5.05 Financing......................................................28
SECTION 5.06 Brokers........................................................28
SECTION 5.07 Ownership of Shares............................................28

                                   ARTICLE VI
                     CONDUCT OF BUSINESS PENDING THE MERGER

SECTION 6.01 Conduct of Business by the Company Pending the Merger..........28

                                   ARTICLE VII
                              ADDITIONAL AGREEMENTS

SECTION 7.01 Company Shareholders Meeting...................................31
SECTION 7.02 Proxy Statement................................................31
SECTION 7.03 Access to Information; Confidentiality.........................32
SECTION 7.04 No Solicitation of Transactions................................32
SECTION 7.05 Employee Benefits Matters......................................35
SECTION 7.06 Directors' and Officers' Indemnification and Insurance.........36
SECTION 7.07 Notification of Certain Matters................................37
SECTION 7.08 Further Action; Reasonable Efforts.............................37
SECTION 7.09 Obligations of Purchaser.......................................39
SECTION 7.10 Public Announcements...........................................39

                                  ARTICLE VIII
                            CONDITIONS TO THE MERGER

SECTION 8.01 Conditions to the Obligations of Parent, Purchaser and the
             Company........................................................40
SECTION 8.02 Conditions to the Obligations of the Company...................40
SECTION 8.03 Conditions to the Obligations of Parent and Purchaser..........41




                                   ARTICLE IX
                        TERMINATION, AMENDMENT AND WAIVER

SECTION 9.01 Termination....................................................41
SECTION 9.02 Effect of Termination..........................................42
SECTION 9.03 Fees and Expenses..............................................42
SECTION 9.04 Amendment and Waiver...........................................43

                                    ARTICLE X
                               GENERAL PROVISIONS

SECTION 10.01 Non-Survival of Representations and Warranties................44
SECTION 10.02 Notices.......................................................44
SECTION 10.03 Severability..................................................45
SECTION 10.04 Entire Agreement; Assignment..................................45
SECTION 10.05 Parties in Interest...........................................45
SECTION 10.06 Specific Performance..........................................45
SECTION 10.07 Governing Law; Jurisdiction...................................46
SECTION 10.08 Waiver of Jury Trial..........................................46
SECTION 10.09 Headings......................................................46
SECTION 10.10 Counterparts..................................................46







            AGREEMENT AND PLAN OF MERGER, dated as of August 8, 2005 (this
"Agreement"), among QUEST DIAGNOSTICS INCORPORATED, a Delaware corporation
("Parent"), FOUNTAIN, INC., a Missouri corporation and a wholly owned subsidiary
of Parent ("Purchaser"), and LABONE, INC., a Missouri corporation (the
"Company").

            WHEREAS, upon the terms and subject to the conditions of this
Agreement and in accordance with the General and Business Corporation Law of the
State of Missouri (the "MGBCL"), Parent, Purchaser and the Company desire to
effect a business combination transaction pursuant to which Purchaser will merge
with and into the Company (the "Merger");

            WHEREAS, the board of directors of the Company (the "Company Board")
has approved this Agreement and resolved to direct the submission of this
Agreement to a vote at a meeting of its shareholders;

            WHEREAS, the respective boards of directors of each of Parent and
Purchaser deem it in the best interests of their respective stockholders and
shareholders, as the case may be, for Purchaser to be merged with and into the
Company upon the terms and subject to the conditions set forth herein, whereby
each issued and outstanding share of common stock, par value $0.01 per share, of
the Company, together with each associated Right (as hereinafter defined) under
the Rights Agreement (as hereinafter defined) (a "Share") not owned by Parent,
Purchaser, the Company or a Subsidiary shall be converted into the right to
receive the Merger Consideration (as hereinafter defined); and

            WHEREAS, certain employees of the Company have executed and
delivered employment agreements with the Company, and which shall become
effective upon consummation of the Merger.

            NOW, THEREFORE, in consideration of the foregoing and the mutual
covenants and agreements herein contained, and intending to be legally bound
hereby, Parent, Purchaser and the Company hereby agree as follows:

                                    ARTICLE I
                                   DEFINITIONS

SECTION 1.01      Definitions.  (a)  For purposes of this Agreement:
                  -----------

            "affiliate" of a specified person means a person who, directly or
      indirectly through one or more intermediaries, controls, is controlled by,
      or is under common control with, such specified person.

            "business day" means any day on which the principal offices of the
      SEC in Washington, D.C. are open to accept filings, or, in the case of
      determining a date when any payment is due, any day (other than a Saturday
      or Sunday) on which banks are not required or authorized to close in The
      City of New York or Kansas City, Missouri.

            "Cincinnati Facility" means the laboratory facility that is located
      at 6700 Steger Road, Cincinnati, Ohio.




            "Code" means the United States Internal Revenue Code of 1986, as
      amended from time to time.

            "Company Stock Option Plans" means the 2001 Long-Term Incentive
      Plan, as amended, the 1997 Long-Term Incentive Plan, as amended, and the
      1987 Long-Term Incentive Plan, as amended.

            "Competing Transaction" means any of the following: (i) any merger,
      consolidation, share exchange, business combination, recapitalization,
      liquidation, dissolution or other similar transaction involving the
      Company; (ii) any sale, lease, exchange, transfer or other disposition of
      all of the consolidated assets of the Company and the Subsidiaries, taken
      as a whole, or a portion thereof having an aggregate value equal to 15% or
      more of the market capitalization of the Company or generating 15% or more
      of the consolidated revenue of the Company and its Subsidiaries, taken as
      a whole, for the fiscal year ended December 31, 2004; (iii) any sale,
      exchange, transfer or other disposition of 15% or more of any class of
      equity securities of the Company; or (iv) any tender offer or exchange
      offer that, if consummated, would result in any person beneficially owning
      15% or more of any class of equity securities of the Company.

            "control" (including the terms "controlled by" and "under common
      control with") means the possession, directly or indirectly, or as trustee
      or executor, of the power to direct or cause the direction of the
      management and policies of a person, whether through the ownership of
      voting securities, as trustee or executor, by contract or credit
      arrangement or otherwise.

            "Disclosure Schedule" shall mean the disclosure schedule delivered
      by the Company to Parent at the time of the execution of this Agreement.

            "Environmental Laws" means any United States federal, state, or
      local statute, rule or regulation relating to Hazardous Substances or the
      protection of the environment, including the following United States
      federal statutes and their state counterparts, as each may be amended from
      time to time, and all regulations thereunder: the Hazardous Materials
      Transportation Act, the Resource Conservation and Recovery Act, the
      Comprehensive Environmental Response, Compensation and Liability Act, the
      Clean Water Act, the Safe Drinking Water Act, the Atomic Energy Act, the
      Federal Insecticide, Fungicide, and Rodenticide Act and the Clean Air Act.

            "Exchange Act" means the Securities Exchange Act of 1934, as
      amended.

            "Expenses" means all reasonable out-of-pocket expenses (including,
      without limitation, all fees and expenses of counsel, accountants,
      financial advisors, experts and consultants to a party hereto and its
      affiliates) incurred by a party or on its behalf in connection with or
      related to the authorization, preparation, negotiation, execution and
      performance of this Agreement, the preparation of the documents related to
      the Merger, the filing of any required notices under the HSR Act or other
      similar regulations and all other matters related to the closing of the
      Merger and the other transactions contemplated by this Agreement.

                                       2


            "Fee" means an amount equal to $26,500,000.

            "Hazardous Substances" means (i) those substances defined in or
      regulated under the following United States federal statutes and their
      state counterparts, as each may be amended from time to time, and all
      regulations thereunder: the Hazardous Materials Transportation Act, the
      Resource Conservation and Recovery Act, the Comprehensive Environmental
      Response, Compensation and Liability Act, the Clean Water Act, the Safe
      Drinking Water Act, the Atomic Energy Act, the Federal Insecticide,
      Fungicide, and Rodenticide Act and the Clean Air Act; (ii) petroleum and
      petroleum products, including crude oil and any fractions thereof; (iii)
      natural gas, synthetic gas, and any mixtures thereof; (iv) polychlorinated
      biphenyls, asbestos and radon; and (v) any other contaminant, substance,
      material or waste regulated by any Governmental Authority pursuant to any
      Environmental Law.

            "Healthcare Business Segment" means clinical laboratories,
      healthcare services and the substance abuse testing business segment of
      the Company and its Subsidiaries.

            "HSR Act" means the Hart Scott Rodino Antitrust Improvements Act of
      1976, as amended.

            "Indebtedness" means, with respect to any person, (a) all
      indebtedness of such person, whether or not contingent, for borrowed
      money, (b) all obligations of such person for the deferred purchase price
      of property (other than in the ordinary course of such person's business),
      (c) all obligations of such person evidenced by notes, bonds, debentures
      or other similar instruments, (d) all indebtedness created or arising
      under any conditional sale or other title retention agreement with respect
      to property acquired by such person (even though the rights and remedies
      of the seller or lender under such agreement in the event of default are
      limited to repossession or sale of such property), (e) all obligations of
      such person as lessee under leases that have been or should be, in
      accordance with GAAP, recorded as capital leases, (f) all obligations,
      contingent or otherwise, of such person under acceptance, letter of credit
      or similar facilities, (g) all obligations of such person to purchase,
      redeem, retire, defease or otherwise acquire for value any capital stock
      of such person or any warrants, rights or options to acquire such capital
      stock, valued, in the case of redeemable preferred stock, at the greater
      of its voluntary or involuntary liquidation preference plus accrued and
      unpaid dividends, (h) all Indebtedness of others referred to in clauses
      (a) through (g) above guaranteed directly or indirectly in any manner by
      such person and (i) all Indebtedness referred to in clauses (a) through
      (g) above secured by (or for which the holder of such Indebtedness has an
      existing right, contingent or otherwise, to be secured by) any encumbrance
      on property (including accounts and contract rights) owned by such person,
      even though such person has not assumed or become liable for the payment
      of such Indebtedness.

            "knowledge of the Company" or "Company's knowledge" means the actual
      knowledge of the individuals listed on Schedule 1.01(a) hereto.

            "Law" means any United States or non-United States federal,
      national, supranational, state, provincial, municipal or local statute,
      law, ordinance, regulation,

                                       3


      rule, code, executive order, injunction, judgment, decree or other order
      of a Governmental Authority.

            "Material Adverse Effect" means any event, circumstance or change
      that, individually or in the aggregate with all other events,
      circumstances or changes, has, or is reasonably likely to (i) have a
      materially adverse effect on the business, condition (financial or
      otherwise) or results of operations of the Company and the Subsidiaries,
      taken as a whole, or (ii) prevent or materially delay the ability of the
      Company to consummate the transactions contemplated by this Agreement;
      provided, however, that the definition of "Material Adverse Effect" shall
      not include any event, circumstance, change or effect resulting from or
      relating to (A) changes in general United States economic conditions or
      changes in the general economic conditions in the geographic areas in
      which the Company or any Subsidiary operates, so long as in any such case
      the Company and its Subsidiaries, taken as a whole, are not materially
      disproportionately affected relative to other entities that operate in
      such geographic areas, (B) changes affecting the industries within which
      the Company and the Subsidiaries operate, so long as in any such case the
      Company and its Subsidiaries, taken as a whole, are not materially
      disproportionately affected relative to other industry participants, (C)
      changes in any applicable Law, (D) the execution or public announcement of
      this Agreement or the transactions contemplated hereby, (E) actions
      expressly required to be taken by the Company pursuant to the terms of
      this Agreement, or (F) any act of terrorism or war (whether or not
      threatened, pending or declared).

            "Ohio Minority Holders" means Vincent DeRisio, Marie Zurieck,
       Joanne Griffith, Rick Margraf and Kenneth W. Clarke.

            "Order" means any executive order, injunction, judgment, decree or
      other order of a Governmental Authority.

            "person" means an individual, corporation, partnership, limited
      partnership, limited liability company, syndicate, person (including,
      without limitation, a "person" as defined in Section 13(d)(3) of the
      Exchange Act), trust, association or entity or government, political
      subdivision, agency or instrumentality of a government.

            "SEC" means the Securities and Exchange Commission.

            "Securities Act" means the Securities Act of 1933, as amended.

            "Specified Amount" means an amount equal to or in excess of two and
      one-half percent (2.5%) of the consolidated revenues of the Company for
      its fiscal year ended December 31, 2004.

            "State Farm Master Agreement" means the Revised Master Agreement for
      Outsourcing Services between State Farm and the Company, dated October 27,
      2000.

            "subsidiary" or "subsidiaries" of the Company, the Surviving
      Corporation, Parent or any other person means an affiliate controlled by
      such person, directly or indirectly through one or more intermediaries.

                                       4


            "Superior Proposal" means an unsolicited written bona fide offer
      made by a third party to consummate any Competing Transaction (i) that is
      on terms that the Company Board determines in its good faith judgment
      (after consultation with its financial advisor and after taking into
      account all the terms and conditions of the contemplated transaction) are
      more favorable to the Company's shareholders (in their capacity as
      shareholders) from a financial point of view than this Agreement (taking
      into account any alterations to this Agreement agreed to in writing by
      Purchaser in response thereto in accordance with Section 7.04), (ii) that
      is not conditioned upon receipt of requisite financing or for which
      financing, to the extent required, is then committed and (iii) that the
      Company Board determines in good faith (after consultation with its
      financial advisor and outside legal counsel (who may be the Company's
      regularly engaged independent legal counsel)) is reasonably capable of
      being consummated; provided, however, that for purposes of this definition
      the reference to "15%" in clauses (ii), (iii) and (iv) of the definition
      of Competing Transaction shall be deemed to be a reference to "50%."

            "Tax Return" shall mean any return, report, declaration, election,
      estimate, claim for refund, information return, statement, form or other
      document filed or required to be filed with any Governmental Authority, in
      connection with the determination, assessment or collection of any Tax or
      the administration of any Laws relating to any Tax, and including any
      schedule or attachment thereto and any amendment thereof.

            "Taxes" shall mean (a) any and all taxes, fees, levies, duties,
      tariffs, imposts and other charges of any kind (together with any and all
      interest, penalties, additions to tax and additional amounts imposed with
      respect thereto) imposed by any Governmental Authority or taxing
      authority, including, without limitation: taxes or other charges on or
      with respect to income, franchise, windfall or other profits, gross
      receipts, property, sales, use, capital stock, payroll, employment, social
      security, workers' compensation, severance, unemployment compensation or
      net worth; taxes or other charges in the nature of excise, withholding, ad
      valorem, stamp, transfer, value-added or gains taxes; license,
      registration and documentation fees; and customers' duties, tariffs and
      similar charges, and (b) any liability for the payment of any Tax (i) as a
      result of being a member of a consolidated, combined, unitary or
      affiliated group that includes any other person, (ii) by reason of any
      obligation to indemnify or otherwise assume or succeed to the liability of
      any other person for Taxes, including, without limitation, a tax sharing,
      tax indemnity or similar agreement and (iii) by reason of transferee or
      successor liability, whether imposed by Law, contractual arrangement or
      otherwise.

            (b) The following terms have the meaning set forth in the Sections
set forth below:

      Defined Term                                        Location of Definition
      ------------                                        ----------------------

      "Action"......................................           ss. 4.09
      "Agreement"...................................           Preamble
      "Balance Sheet"...............................           ss. 4.07(c)
      "Certificates"................................           ss. 3.04(b)
      "Change in the Company Recommendation"........           ss. 7.04(c)
      "CLIA"........................................           ss. 4.06(d)

                                       5


      Defined Term                                        Location of Definition
      ------------                                        ----------------------

      "Closing".....................................           ss. 2.02
      "Company".....................................           Preamble
      "Company Board"...............................           Preamble
      "Company Employees"...........................           ss. 7.05(a)
      "Company Preferred Stock".....................           ss. 4.03(a)
      "Company Shareholders Meeting"................           ss. 7.01
      "Company Stock Awards"........................           ss. 4.03(a)
      "Confidentiality Agreement"...................           ss. 7.03(b)
      "Credit Agreement"............................           ss. 4.03(d)
      "Debentures"..................................           ss. 4.03(b)
      "Disclosure Schedule".........................           ss. 4.01(b)
      "Dissent Shares"..............................           ss. 3.03(a)
      "DOJ".........................................           ss. 7.08(b)
      "Effective Time"..............................           ss. 2.02
      "Enforceability Exceptions"...................           ss. 4.04(a)
      "Environmental Permits".......................           ss. 4.16
      "ERISA".......................................           ss. 4.10(a)
      "FTC".........................................           ss. 7.08(b)
      "GAAP"........................................           ss. 4.07(b)
      "Governmental Authority"......................           ss. 4.05(b)
      "HSR Filing"..................................           ss. 7.08(b)
      "Indemnifiable Claim".........................           ss. 7.06(c)
      "Indemnitees".................................           ss. 7.06(c)
      "Intellectual Property".......................           ss. 4.14(b)
      "IRS".........................................           ss. 4.10(a)
      "Lease Documents".............................           ss. 4.13(b)
      "Liens".......................................           ss. 4.17(a)
      "Listed Contracts"............................           ss. 4.18(a)
      "Management Letters"..........................           ss. 4.07(d)
      "Merger"......................................           Recitals
      "Merger Consideration"........................           ss. 3.01(a)
      "MGBCL".......................................           Recitals
      "Multiemployer Plan"..........................           ss. 4.10(b)
      "Multiple Employer Plan"......................           ss. 4.10(b)
      "Outside Date"................................           ss. 9.01(b)
      "Parent"......................................           Preamble
      "Paying Agent"................................           ss. 3.04(a)
      "Plans".......................................           ss. 4.10(a)
      "Pre-Closing Service".........................           ss. 7.05(a)
      "Proxy Statement".............................           ss. 4.05(b)
      "Purchaser"...................................           Preamble
      "Requisite Shareholder Approval"..............           ss. 4.04(c)
      "Rights"......................................           ss. 4.03(b)
      "Rights Agreement"............................           ss. 4.03(b)
      "SEC Reports".................................           ss. 4.07(a)

                                       6


      Defined Term                                        Location of Definition
      ------------                                        ----------------------

      "Share".......................................           Recitals
      "Stock Option"................................           ss. 3.02
      "Subsidiary"..................................           ss. 4.01(a)
      "Surviving Corporation".......................           ss. 2.01
      "Third Party".................................           ss. 7.04(b)

                                   ARTICLE II
                                   THE MERGER

          SECTION 2.01 The Merger. Upon the terms and subject to the conditions
set forth in Article VIII, and in accordance with the MGBCL, at the Effective
Time (as defined in Section 2.02), Purchaser shall be merged with and into the
Company. As a result of the Merger, the separate corporate existence of
Purchaser shall cease and the Company shall continue as the surviving
corporation of the Merger (the "Surviving Corporation").

          SECTION 2.02 Effective Time; Closing. As promptly as practicable after
the satisfaction or, if permissible, waiver of the conditions set forth in
Article VIII, but in no event later than five business days after all such
conditions have been satisfied or waived, the parties hereto shall cause the
Merger to be consummated by filing articles of merger complying with the
requirements of the MGBCL with the Secretary of State of the State of Missouri.
The Merger shall become effective at the time of the issuance of the certificate
of merger by the Secretary of State of the State of Missouri (the "Effective
Time"). Immediately prior to the filing of the articles of merger, a closing
("Closing") shall be held at the offices of Shearman & Sterling LLP, 599
Lexington Avenue, New York, New York 10022, or such other place as the parties
shall agree, for the purpose of confirming the satisfaction or waiver, as the
case may be, of the conditions set forth in Article VIII.

          SECTION 2.03 Effect of the Merger. At the Effective Time, the effect
of the Merger shall be as provided in the applicable provisions of the MGBCL.
Without limiting the generality of the foregoing, and subject thereto, at the
Effective Time, all of the property, rights, privileges, powers and franchises
of the Company and Purchaser shall vest in the Surviving Corporation, and all
debts, liabilities, obligations, restrictions, disabilities and duties of each
of the Company and Purchaser shall become the debts, liabilities, obligations,
restrictions, disabilities and duties of the Surviving Corporation.

          SECTION 2.04 Articles of Incorporation; Bylaws. (a) At the Effective
Time, and subject to Section 7.06(a), the Articles of Incorporation of the
Company shall be the Articles of Incorporation of the Surviving Corporation
until thereafter amended as provided by Law and such Articles of Incorporation.

          (b) At the Effective Time, and subject to Section 7.06(a), the Bylaws
of the Company shall be the Bylaws of the Surviving Corporation until thereafter
amended as provided by Law, the Articles of Incorporation of the Surviving
Corporation and such Bylaws.

          SECTION 2.05 Directors and Officers. At the Effective Time, the
directors of Purchaser immediately prior to the Effective Time shall be the
initial directors of the Surviving

                                       7


Corporation, each to hold office in accordance with the MGBCL, the Articles of
Incorporation and the Bylaws of the Surviving Corporation, and the officers of
the Company immediately prior to the Effective Time shall be the initial
officers of the Surviving Corporation, in each case until their respective
successors are duly elected or appointed and qualified or until their earlier
death, resignation or removal.

                                   ARTICLE III
                            CONVERSION OF SECURITIES

          SECTION 3.01 Conversion of Securities. At the Effective Time, by
virtue of the Merger and without any action on the part of Parent, Purchaser,
the Company or the holders of any of the following securities:

               (a) Each Share issued and outstanding immediately prior to
     the Effective Time (other than the Shares cancelled in accordance with
     Section 3.01(b) and Dissent Shares (as hereinafter defined), if any)
     shall be cancelled and shall be converted automatically into the right
     to receive from the Surviving Corporation $43.90 per share in cash,
     without interest (the "Merger Consideration"), payable to the holder
     thereof upon surrender, in the manner provided in Section 3.04 of the
     certificate or certificates which immediately prior to the Effective
     Time evidenced such Shares.

               (b) Each Share that is held by the Company as treasury stock
     or by any of its Subsidiaries and any Shares owned by Parent or
     Purchaser immediately prior to the Effective Time shall be cancelled
     and retired and shall cease to exist, and no Merger Consideration
     shall be delivered in exchange therefor.

               (c) Each share of common stock, par value $0.01 per share,
     of Purchaser issued and outstanding immediately prior to the Effective
     Time shall be converted into and exchanged for one validly issued,
     fully paid and nonassessable share of common stock, par value $0.01
     per share, of the Surviving Corporation.

          SECTION 3.02 Employee Stock Options. The Company shall (i) use its
reasonable best efforts to, effective as of the Effective Time, terminate the
Company Stock Option Plans, as amended through the date of this Agreement, (ii)
use its reasonable best efforts to cause, effective at or prior to the Effective
Time, each outstanding option to purchase Shares (each, a "Stock Option")
granted under the 1987 Long-Term Incentive Plan that is outstanding and
unexercised prior to the Effective Time, to either (A) be exercised or
terminated prior to the Effective Time or (B) be cancelled as of the Effective

                                       8


Time to the extent in effect immediately prior to the Effective Time (subject to
the obligations of the Surviving Corporation in the immediately following
sentence), (iii) cause each Stock Option that is outstanding and unexercised
prior to the Effective Time under the 1997 Long-Term Incentive Plan to become
fully vested and exercisable prior to the Effective Time and be cancelled as of
the Effective Time to the extent in effect immediately prior to the Effective
Time (subject to the obligations of the Surviving Corporation in the immediately
following sentence) and (iv) cause each Stock Option that is outstanding and
unexercised prior to the Effective Time under the 2001 Long-Term Incentive Plan
to become fully vested and exercisable prior to the Effective Time and either
(A) be exercised or terminated prior to the Effective Time or (B) be cancelled
as of the Effective Time to the extent in effect immediately prior to the
Effective Time (subject to the obligations of the Surviving Corporation in the
immediately following sentence). Each holder of a Stock Option that is
outstanding and unexercised immediately prior to the Effective Time and that has
an exercise price per share that is less than the per share Merger Consideration
applicable to the Shares issuable to the holder of such Stock Option upon
exercise shall be entitled (subject to the provisions of the last sentence of
this Section 3.02) to be paid by the Surviving Corporation immediately after the
Effective Time, in exchange for the cancellation of such Stock Option, an amount
in cash, with respect to each Share subject to the Stock Option, equal to the
excess of the applicable per share Merger Consideration payable with respect to
such Share over the applicable per share exercise price of such Stock Option.
Any payments made pursuant to this Section 3.02 shall be subject to all
applicable federal, state and local Tax withholding requirements.

          SECTION 3.03 Dissent Rights. (a) Notwithstanding any provision of this
Agreement to the contrary, to the extent permitted by the MGBCL, Shares that are
outstanding immediately prior to the Effective Time and that are held by any
person who is entitled to demand and properly demands payment of the fair value
of such Shares pursuant to, and who complies in all respects with, Section
351.455 of the MGBCL (collectively, the "Dissent Shares") shall not be converted
into, or represent the right to receive, the Merger Consideration. Such
shareholders shall be entitled to payment of the fair value of such Dissent
Shares in accordance with and subject to Section 351.455 of the MGBCL; provided,
however, that if any holder of Dissent Shares shall have failed to perfect or
effectively shall have withdrawn or lost their right to be paid fair value under
Section 351.455 of the MGBCL, then the right of such holder to be paid fair
value for such Dissent Shares shall cease and such Dissent Shares shall
thereupon be deemed to have been converted into, and to have become exchangeable
for, as of the Effective Time, the right to receive the Merger Consideration,
without any interest thereon, upon surrender of the certificate or certificates
that formerly evidenced such Shares, in the manner provided in Section 3.04.

          (b) The Company shall give Parent (i) prompt notice of any demands for
payment of the fair value of any Shares received by the Company, withdrawals of
such demands, and any other related instruments served pursuant to the MGBCL and
received by the Company and (ii) the opportunity to direct all negotiations and
proceedings with respect to demands for payment of fair value under the MGBCL.
The Company shall not, except with the prior written consent of Parent, make any
payment with respect to any demands for payment of fair value or offer to settle
or settle any such demands.

          SECTION 3.04 Surrender of Shares; Stock Transfer Books. (a) Prior to
the Effective Time, Purchaser shall designate a bank or trust company reasonably
satisfactory to the Company to act as agent (the "Paying Agent") for the holders
of Shares to receive the funds to which holders of Shares shall become entitled
pursuant to Section 3.01(a). Immediately after the Effective Time, Parent shall,
or shall cause Purchaser to, transfer such funds to the Paying Agent by wire
transfer of immediately available funds. Such funds shall be invested by the
Paying Agent as directed by Parent; provided, however, that such investments
shall be in obligations of or guaranteed by the United States of America or any
agency or instrumentality thereof and backed by the full faith and credit of the
United States of America, in commercial paper obligations rated A-1 or P-1 or
better by Moody's Investors Service, Inc. or Standard & Poor's

                                       9


Corporation, respectively, or in certificates of deposit, bank repurchase
agreements or banker's acceptances of commercial banks with capital exceeding $1
billion. Any net profit resulting from, or interest income produced by, such
investments shall be payable to Parent.

          (b) Promptly after the Effective Time, but in no event later than
three business days thereafter, the Surviving Corporation shall cause to be
mailed to each person who was, at the Effective Time, a holder of record of
Shares entitled to receive the Merger Consideration pursuant to Section 3.01(a)
a form of letter of transmittal (which shall specify that delivery shall be
effected, and risk of loss and title to the certificates evidencing such Shares
(the "Certificates") shall pass, only upon proper delivery of the Certificates,
to the Paying Agent and which shall be in such form and with such additional
provisions as the Surviving Corporation may reasonably specify) and instructions
for use in effecting the surrender of the Certificates pursuant to such letter
of transmittal. Upon surrender to the Paying Agent of a Certificate, together
with such letter of transmittal, duly completed and validly executed in
accordance with the instructions thereto, and such other documents as may be
required pursuant to such instructions, the holder of such Certificate shall be
entitled to receive in exchange therefor the Merger Consideration for each Share
formerly evidenced by such Certificate, and such Certificate shall then be
canceled. No interest shall accrue or be paid on the Merger Consideration
payable upon the surrender of any Certificate for the benefit of the holder of
such Certificate. If the payment equal to the Merger Consideration is to be made
to a person other than the person in whose name the surrendered Certificate
formerly evidencing Shares is registered on the stock transfer books of the
Company, it shall be a condition of payment that the Certificate so surrendered
shall be endorsed properly or otherwise be in proper form for transfer and that
the person requesting such payment shall have paid all transfer and other Taxes
required by reason of the payment of the Merger Consideration to a person other
than the registered holder of the Certificate surrendered, or shall have
established to the satisfaction of Purchaser that such Taxes either have been
paid or are not applicable. If any holder of Shares is unable to surrender such
holder's Certificates because such Certificates have been lost, mutilated or
destroyed, such holder may deliver in lieu thereof an affidavit and, if required
by the Surviving Corporation, indemnity bond in form and substance and with
surety reasonably satisfactory to the Surviving Corporation.

          (c) At any time following the nine-month anniversary of the Effective
Time, the Surviving Corporation shall be entitled to require the Paying Agent to
deliver to it any funds that had been made available to the Paying Agent and not
disbursed to holders of Shares (including, without limitation, all interest and
other income received by the Paying Agent in respect of all funds made available
to it), and, thereafter, such holders shall be entitled to look to the Surviving
Corporation (subject to abandoned property, escheat and other similar Laws) only
as general creditors thereof with respect to any Merger Consideration that may
be payable upon due surrender of the Certificates held by them. Notwithstanding
the foregoing, neither the Surviving Corporation nor the Paying Agent shall be
liable to any holder of a Share for any Merger Consideration delivered in
respect of such Share to a public official pursuant to any abandoned property,
escheat or other similar Law.

          (d) At the close of business on the day of the Effective Time, the
stock transfer books of the Company shall be closed and thereafter there shall
be no further registration of transfers of Shares on the records of the Company.
From and after the Effective Time, the

                                       10


holders of Shares outstanding immediately prior to the Effective Time shall
cease to have any rights with respect to such Shares except as otherwise
provided herein or by applicable Law.

          SECTION 3.05 Withholding Rights. Each of Parent, Purchaser, the
Surviving Corporation and the Paying Agent shall be entitled to deduct and
withhold from any amounts otherwise payable pursuant to this Agreement such
amount as it is required to deduct and withhold with respect to the making of
such payment under the Code or any Law. To the extent that amounts are so
withheld, such withheld amounts shall be treated for purposes of this Agreement
as having been paid to the holder of the Shares in respect of which such
deduction and withholding was made.

                                  ARTICLE IV
                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

            As an inducement to Parent and Purchaser to enter into this
Agreement, except as set forth in the Disclosure Schedule or specifically
disclosed in the SEC Reports filed prior to the date of this Agreement, the
Company hereby represents and warrants to Parent and Purchaser as follows:

          SECTION 4.01 Organization and Qualification; Subsidiaries. (a) The
Company is duly organized, validly existing and in good standing under the Laws
of the jurisdiction of its organization and has the requisite corporate power
and authority to own, lease and operate its properties and to carry on its
business as it is now being conducted. Each subsidiary of the Company (each a
"Subsidiary") is duly organized, validly existing and in good standing under the
Laws of the jurisdiction of its organization and has the requisite corporate
power and authority to own, lease and operate its properties and to carry on its
business as it is now being conducted, except where the failure to be so
organized, existing or in good standing or to have such power and authority
would not have a Material Adverse Effect. The Company and each Subsidiary is
duly qualified or licensed as a foreign corporation to do business, and is in
good standing, in each jurisdiction where the character of the properties owned,
leased or operated by it or the nature of its business makes such qualification
or licensing necessary, except for such failures to be so qualified or licensed
and in good standing that would not have a Material Adverse Effect.

          (b) A true and complete list of all the Subsidiaries, together with
the jurisdiction of organization of each Subsidiary, the percentage of the
outstanding capital stock of each Subsidiary owned by the Company and each other
Subsidiary, is set forth in Section 4.01(b) of the Disclosure Schedule. The
Company does not directly or indirectly own any equity or similar interest in,
or any interest convertible into or exchangeable or exercisable for any equity
or similar interest in, any corporation, partnership, joint venture or other
business association or entity.

          SECTION 4.02 Articles of Incorporation and Bylaws. The Company has
heretofore furnished to Parent a complete and correct copy of the Articles of
Incorporation and the Bylaws or equivalent organizational documents, each as
amended to date, of the Company and each Subsidiary. Such Articles of
Incorporation, Bylaws or equivalent organizational documents, as amended to
date, are in full force and effect. Neither the Company nor any

                                       11


Subsidiary is in violation of any of the provisions of its Articles of
Incorporation, Bylaws or equivalent organizational documents.

          SECTION 4.03 Capitalization. (a) The authorized capital stock of the
Company consists of 40,000,000 Shares and 3,000,000 shares of preferred stock,
par value $0.01 per share ("Company Preferred Stock"). As of the date of this
Agreement, (i) 17,489,058 Shares are issued and outstanding (excluding Shares
held in the treasury of the Company), all of which are duly authorized, validly
issued, fully paid and nonassessable and were issued free of preemptive (or
similar) rights, (ii) 538,671 Shares are held in the treasury of the Company,
(iii) no Shares are held by the Subsidiaries and (iv) 1,621,920 Shares are
reserved for future issuance pursuant to outstanding Company Stock Options and
other purchase rights (the "Company Stock Awards") granted pursuant to the
Company Stock Option Plans. As of the date of this Agreement, no shares of
Company Preferred Stock are issued and outstanding. Section 4.03(a)(i) of the
Disclosure Schedule sets forth the following information with respect to each
Company Stock Award outstanding on the date of this Agreement: (i) the name of
the Company Stock Award recipient; (ii) the particular plan pursuant to which
such Company Stock Award was granted; (iii) the number of Shares subject to such
Company Stock Award; (iv) the exercise or purchase price of such Company Stock
Award; (v) the date on which such Company Stock Award was granted; (vi) the
applicable vesting schedule; and (vii) the date on which such Company Stock
Award expires. All Shares subject to issuance as aforesaid, upon issuance on the
terms and conditions specified in the instruments pursuant to which they are
issuable, will be duly authorized, validly issued, fully paid and nonassessable.

          (b) Except (i) as set forth in Section 4.03(a) of this Agreement, (ii)
for the rights (the "Rights") issued pursuant to the Rights Agreement, dated as
of February 11, 2000, as amended by Amendment No. 1 to Rights Agreement, dated
as of August 31, 2001, and Amendment No. 2 to Rights Agreement, dated as of
April 20, 2005 (as so amended, and as further amended from time to time, the
"Rights Agreement"), between the Company and American Stock Transfer & Trust
Company, as rights agent, in respect of which no Distribution Date (as defined
in the Rights Agreement) has occurred, (iii) for the 3.50% Convertible Senior
Debentures Due 2034 (the "Debentures") issued pursuant to the Indenture, dated
as of June 25, 2004, between the Company and Wells Fargo Bank, National
Association, as trustee and (iv) for the 1,398 shares of voting common stock,
par value $0.01, of LabOne of Ohio, Inc., a Delaware corporation, owned by the
Ohio Minority Holders, there are no (A) subscriptions, calls, contracts,
options, warrants or other rights, agreements, arrangements, understandings,
restrictions or commitments of any character to which the Company or any
Subsidiary is a party or by which the Company or any Subsidiary is bound
relating to the issued or unissued capital stock of the Company or any
Subsidiary or obligating the Company or any Subsidiary to issue or sell any
shares of capital stock of, other equity interests in or debt securities of, the
Company or any Subsidiary, (B) securities of the Company or securities
convertible, exchangeable or exercisable for shares of capital stock or voting
securities of the Company, or (C) equity equivalents, stock appreciation rights,
phantom stock, ownership interests in the Company or any Subsidiary or similar
rights. All Shares subject to issuance as set forth in Section 4.03(a) of this
Agreement, upon issuance on the terms and conditions specified in the
instruments pursuant to which they are issuable, will be duly authorized,
validly issued, fully paid and nonassessable and free of preemptive (or similar)
rights. Except for the Debentures, there are no outstanding contractual
obligations of the Company or any Subsidiary to repurchase, redeem or otherwise

                                       12


acquire any outstanding securities of the Company or any Subsidiary, to vote or
to dispose of any Shares or any capital stock of any Subsidiary or to make any
investment (in the form of a loan, capital contribution or otherwise) in, any
Subsidiary or any other person. None of the Company or any Subsidiary is a party
to any shareholders' agreement, voting trust agreement or registration rights
agreement relating to any equity securities of the Company or any Subsidiary or
any other Contract relating to disposition, voting or dividends with respect to
any equity securities of the Company or of any Subsidiary, other than the
registration rights agreement entered into in connection with the Debentures. No
dividends on the Shares have been declared or have accrued since December 31,
2004. All of the Shares have been issued by the Company in compliance with
applicable federal securities Laws.

          (c) Each outstanding share of capital stock (or other equity interest)
of each Subsidiary is duly authorized, validly issued, fully paid and
nonassessable and was issued free of preemptive (or similar) rights, and other
than the shares of LabOne of Ohio, Inc. owned by the Ohio Minority Holders, each
such share is owned by the Company or another Subsidiary free and clear of all
options, rights of first refusal, agreements, limitations on the Company's or
any Subsidiary's voting, dividend or transfer rights, charges and other
encumbrances or liens of any nature whatsoever.

          (d) The only principal amount of outstanding indebtedness for borrowed
money of the Company and the Subsidiaries (not including intercompany amounts,
capital leases, purchase price obligations with respect to acquisitions or the
Debentures) is (i) $9,000,000 in aggregate principal amount of City of Lenexa,
Kansas Taxable Industrial Revenue Bonds due September 1, 2009, (ii) borrowings
that would be permitted under Section 6.01(e) of this Agreement if incurred
after the date hereof and (iii) CDN$1,000,000 (one-million Canadian dollars)
outstanding as of the date hereof under the Company's $175,000,000 Amended and
Restated Credit Agreement, dated as of August 11, 2004, among the Company, the
lenders named therein and JPMorgan Chase Bank, as Administrative Agent and
Collateral Agent (the "Credit Agreement").

          SECTION 4.04 Authority Relative to this Agreement. (a) The Company has
all necessary corporate power and corporate authority to execute and deliver
this Agreement, to perform its obligations hereunder and, subject to obtaining
the Requisite Shareholder Approval, to consummate the Merger. The execution and
delivery of this Agreement by the Company and the consummation by the Company of
the Merger have been duly and validly authorized by all necessary corporate
action on the part of the Company, and no other corporate proceedings on the
part of the Company or its holders of Shares are necessary to authorize this
Agreement or to consummate the Merger (other than, with respect to the Merger,
(i) obtaining the Requisite Shareholder Approval and (ii) filing and recording
appropriate merger documents as required by the MGBCL). This Agreement has been
duly and validly executed and delivered by the Company and, assuming the due
authorization, execution and delivery by Parent and Purchaser, constitutes a
legal, valid and binding obligation of the Company, enforceable against the
Company in accordance with its terms subject to the effect of any applicable
bankruptcy, insolvency (including all Laws relating to fraudulent transfers),
reorganization, moratorium or similar Laws affecting creditors' rights generally
and subject to the effect of general principles of equity (collectively, the
"Enforceability Exceptions"). The Company Board has unanimously

                                       13


approved this Agreement and no restrictions on business combinations set forth
in the MGBCL shall apply to the Merger.

          (b) The Company Board, at a meeting duly called and held, duly and
unanimously adopted resolutions (i) approving this Agreement and the Merger
contemplated by this Agreement and directing the submission of this Agreement to
a vote at a meeting of shareholders of the Company, (ii) determining that the
terms of the Merger are fair to and in the best interests of the Company and its
shareholders and (iii) subject to the terms of this Agreement, recommending that
the Company's shareholders approve this Agreement. Such resolutions are the only
resolutions necessary in order for the Merger to comply with Article Ten and
Article Twelve of the Company's Articles of Incorporation. In addition, based
upon the representations made in Section 5.07 hereof, the Company Board has
taken all action necessary to render (A) Section 351.407 of the MGBCL and (B)
Section 351.459 of the MGBCL inapplicable to this Agreement, the Merger, and to
Parent and Purchaser to the extent of this Agreement, or the Merger. No other
state takeover statute or regulation is applicable to Company with respect to
this Agreement or the Merger.

          (c) The only vote of holders of any class or series of capital stock
of the Company necessary to approve this Agreement and the Merger is the
approval of this Agreement by the holders of two-thirds or more of the
outstanding Shares (the "Requisite Shareholder Approval").

          SECTION 4.05 No Conflict; Required Filings and Consents. (a) The
execution and delivery of this Agreement by the Company do not, and the
performance of this Agreement and the consummation of the Merger by the Company
will not, (i) conflict with or violate the Articles or the Bylaws or the
articles of incorporation or bylaws (or any equivalent organizational documents)
of any Subsidiary, (ii) assuming that all consents, approvals and other
authorizations described in Section 4.05(b) of this Agreement have been obtained
and that all filings and other actions described in Section 4.05(b) of this
Agreement have been made or taken, conflict with or violate any Law applicable
to the Company or any Subsidiary or by which any property or asset of the
Company or any Subsidiary is bound or affected, or (iii) except with respect to
the Debentures, result in any breach of or constitute a default (or an event
which, with notice or lapse of time or both, would become a default) under, or
give to others any right of termination, amendment, acceleration or cancellation
of, or result in the creation of a lien or other encumbrance on any property or
asset of the Company or any Subsidiary pursuant to, any note, bond, mortgage,
indenture, contract, agreement, lease, license, permit, franchise or other
instrument or obligation to which the Company or any Subsidiary is a party or by
which the Company or a Subsidiary or any property or asset of the Company or any
Subsidiary is bound or affected, except with respect to clause (ii) or (iii),
for any such conflicts, violations, breaches, defaults or other occurrences that
would not have a Material Adverse Effect.

          (b) The execution and delivery of this Agreement by the Company do
not, and the performance of this Agreement and the consummation by the Company
of the Merger will not, require any consent, approval, authorization or permit
of, or filing with or notification to, any United States or non-United States
supranational, national, federal, state, provincial, municipal or local
government, governmental, regulatory or administrative authority, agency,
instrumentality or commission or any court, tribunal, or judicial or arbitral
body (a

                                       14


"Governmental Authority"), except for (i) applicable requirements, if any, of
the Exchange Act or state securities Laws, (ii) the pre-merger notification
requirements of the HSR Act, (iii) the filing with the SEC of a proxy statement
relating to the approval of this Agreement by the Company's shareholders (as
amended or supplemented from time to time, the "Proxy Statement"), (iv) any
required filing with, and any approvals required under, the rules and
regulations of the NASDAQ National Market, (v) the filing and recordation of
appropriate merger documents as required by the MGBCL, and (vi) where the
failure to obtain such consents, approvals, authorizations or permits, or to
make such filings or notifications, would not have a Material Adverse Effect.

          SECTION 4.06 Permits; Compliance. (a) The Company and each Subsidiary
is in compliance with all Laws applicable to the Company or any Subsidiary or by
which its or any of their respective properties or assets are bound, except for
any such failure to be in compliance which would not have a Material Adverse
Effect. The Company and the Subsidiaries have all permits, licenses,
authorizations, exemptions, orders, consents, approvals and franchises from any
Governmental Authority required to own, lease and operate their respective
properties or conduct their respective businesses as now being conducted, except
for any such permit, license, authorization, exemption, order, consent, approval
or franchise the absence of which would not have a Material Adverse Effect.

          (b) None of the Company or any Subsidiary or any individual who is
currently an executive officer, director or, to the knowledge of the Company,
employee of the Company or any Subsidiary (i) has been convicted of, or to the
knowledge of the Company, charged with a Medicare, Medicaid or state health
program-related offense, (ii) since December 31, 2002, has been convicted of, or
to the knowledge of the Company, investigated for or charged with a violation of
Law related to fraud, theft, embezzlement, financial misconduct or obstruction
of an investigation, (iii) has been excluded or suspended from participation in
Medicare, Medicaid or any federal or state health program, or (iv) since
December 31, 2002, has been subject to any Order of, or any criminal or civil
fine or penalty imposed by, any Governmental Authority with respect to any such
Medicare, Medicaid or any other federal or state health care program.

          (c) The Company has made available to Parent prior to the date of this
Agreement true and complete copies of (i) all material surveys, reports,
notices, inquiries, subpoenas and other correspondence related to any
certification, licensure or other inspections directly or indirectly impacting
the Healthcare Business Segment, and summaries of all proficiency test results
relating to the Healthcare Business Segment for the period from December 31,
2002 (or, if later than such date, in the case of a Subsidiary, from the date
such entity became a Subsidiary) through the date hereof, (ii) all material
written inquiries, notices, requests for records, subpoenas and correspondence
received by the Company or any Subsidiary related to utilization, reimbursement
or other material audits or investigations relating to the Healthcare Business
Segment for the period from December 31, 2002 (or, if later than such date, in
the case of a Subsidiary, from the date such entity became a Subsidiary) through
the date hereof, (iii) filings made by the Company or any Subsidiary pursuant to
Section 1887 of the Social Security Act (42 U.S.C. Section 1395nn), and (iv) all
current licenses or certifications of the Company or any Subsidiary under the
Clinical Laboratory Improvement Act of 1988 and the regulations promulgated
thereunder ("CLIA").

                                       15


          (d) Except as would not be material to the Company and the
Subsidiaries, taken as a whole, (i) none of the Company nor any Subsidiary has
engaged in any activities that are prohibited under or would violate Medicare
and Medicaid statutes, 42 U.S.C. Sections 1320a 7a and 7b, or the regulations
promulgated pursuant to such statutes, or comparable state or local Law or rules
of professional conduct, (ii) the Company and the Subsidiaries have timely and
accurately filed all requisite claims and other reports required to be filed in
connection with all applicable state and federal Medicare and Medicaid programs
due on or before the date of this Agreement, (iii) there is no arrangement
providing for any rebates, kickbacks or other forms of compensation that is
unlawful to be paid to any person or entity in return for the referral of
business or for the arrangement for recommendation of such referrals, and (iv)
none of the Company nor any Subsidiary has any financial arrangement which
renders any of its billings unlawful pursuant to any Law.

          (e) To the knowledge of the Company, all agreements of the Company and
the Subsidiaries with third party healthcare payors were entered into by the
Company or a Subsidiary, as the case may be, in the ordinary course of business.
The Company and the Subsidiaries are in compliance with each of their respective
third party healthcare payor agreements, and the Company and the Subsidiaries
have properly charged and billed in accordance with the terms of their
respective third party healthcare payor agreements, including, where applicable,
billing and collection of all deductibles and co-payments, except for any such
failure to comply or to properly charge and bill that would not have a Material
Adverse Effect.

          (f) Neither the Company nor any Subsidiary has since December 31, 2002
(or, if later than such date, in the case of a Subsidiary, from the date such
entity became a Subsidiary) received written notice from any Governmental
Authority that it has been the subject of any inspection, investigation, survey,
audit, monitoring or other form of review by any Governmental Authority,
professional review organization, accrediting organization or certifying agency
for the purpose of any alleged improper activity on the part of such entity,
other than routine audits or inquiries and other than those that would not have
a Material Adverse Effect.

          SECTION 4.07 SEC Filings; Financial Statements. (a) The Company has
filed or otherwise transmitted all forms, reports, statements, schedules,
registration statements and other documents required to be filed by it with the
SEC since December 31, 2002 (such forms, reports, statements, schedules,
registration statements and other documents being collectively, the "SEC
Reports"). Each SEC Report (i) at the time it was filed or, if amended, as of
the date of such amendment, complied in all material respects and was prepared
in all material respects in accordance with the applicable requirements of the
Securities Act or the Exchange Act, as the case may be, and the rules and
regulations promulgated thereunder, each in effect on the date so filed, and
(ii) did not, at the time it was filed, or, if amended, as of the date of such
amendment, contain any untrue statement of a material fact or omit to state a
material fact required to be stated therein or necessary in order to make the
statements made therein, in the light of the circumstances under which they were
made, not misleading. No Subsidiary is required to file any form, report or
other document with the SEC.

          (b) Each of the consolidated financial statements (including, in each
case, any notes thereto) contained in the SEC Reports was prepared in accordance
with United States generally accepted accounting principles ("GAAP") applied on
a consistent basis throughout the

                                       16


periods indicated (except as may be indicated in such statements or the notes
thereto) and each fairly presents, in all material respects, the consolidated
financial position, results of operations and cash flows of the Company and its
consolidated Subsidiaries as at the respective dates thereof and for the
respective periods indicated therein except as otherwise noted therein
(including, in each case, in any notes thereto, and subject, in the case of
unaudited statements, to normal period-end adjustments).

          (c) Except as and to the extent set forth on the consolidated balance
sheet of the Company and the consolidated Subsidiaries as of December 31, 2004,
including the notes thereto (the "Balance Sheet"), neither the Company nor any
Subsidiary has any liability or obligation of any nature (whether accrued,
absolute, contingent or otherwise), in each case that is required by GAAP to be
set forth in a consolidated balance sheet of the Company or disclosed in the
notes thereto, except for liabilities and obligations (including purchasing
obligations) (i) incurred in the ordinary course of business since December 31,
2004, or (ii) that would not be material to the Company and its Subsidiaries
taken as a whole.

          (d) Section 4.07(d) of the Disclosure Schedule lists all "management
letters" and other similar letters relating to the Company's or any of its
Subsidiaries' internal controls and accounting practices that have been received
by the Company from its independent accountants since January 1, 2002 (the
"Management Letters"). True and complete copies of all Management Letters have
been made available to Parent.

          (e) The Company conducted an assessment of its internal control over
financial reporting as of December 31, 2004 pursuant to Section 404 of the
Sarbanes-Oxley Act of 2002 and found it to be effective to provide reasonable
assurance regarding the reliability of financial reporting and the preparation
of financial statements for external purposes in accordance with GAAP and, since
such time, to the knowledge of the persons listed on Schedule 1.01(a) hereto,
the Company has obtained no knowledge of any material weaknesses or significant
deficiencies in internal control over financial reporting. The management of the
Company has (x) implemented disclosure controls and procedures (as defined in
Rule 13a-15(e) of the Exchange Act) to ensure that material information relating
to the Company, including its consolidated Subsidiaries, is made known to the
management of the Company by others within those entities and such controls are
effective to provide reasonable assurance regarding the reliability of financial
reporting and the preparation of financial statements for external purposes in
accordance with GAAP, and (y) disclosed on a timely basis, based on its most
recent evaluation, to the Company's outside auditors and the audit committee of
the Company Board (A) all significant deficiencies and material weaknesses in
the design or operation of internal control over financial reporting (as defined
in Rule 13a-15(f) of the Exchange Act) which are reasonably likely to adversely
affect the Company's ability to record, process, summarize and report financial
data and (B) any fraud, whether or not material, that involves management or
other employees who have a significant role in the Company's internal control
over financial reporting.

          (f) Since December 31, 2002, neither the Company, any Subsidiary nor,
to the Company's knowledge, any director, officer, employee, auditor, accountant
or representative of the Company or any Subsidiary, has received or otherwise
had or obtained knowledge of any material complaint, allegation, assertion or
claim, whether written or oral, regarding the

                                       17


accounting or auditing practices, procedures, methodologies or methods of the
Company or any Subsidiary or their respective internal accounting controls or
any complaint, allegation, assertion or claim that the Company or any Subsidiary
has engaged in questionable accounting or auditing practices. To the knowledge
of the Company, no attorney representing the Company or any Subsidiary, whether
or not employed by the Company or any Subsidiary, has reported evidence of a
material violation of securities Laws, breach of fiduciary duty or similar
violation by the Company or any of its officers, directors, employees or agents
to the Company Board or any committee thereof or to any director or officer of
the Company. Since December 31, 2002, there have been no internal investigations
regarding accounting or financial reporting discussed with, reviewed by or
initiated at the direction of the chief executive officer, chief financial
officer, general counsel, the Company Board or any committee thereof.

          SECTION 4.08 Absence of Certain Changes or Events. Since March 31,
2005, except as expressly contemplated by this Agreement, (a) the Company and
the Subsidiaries have conducted their businesses in all material respects only
in the ordinary course of business and in a manner consistent with past
practice, and (b) there has not been any Material Adverse Effect, and none of
the Company or any Subsidiary has taken any action that, if taken after the date
of this Agreement, would constitute a breach of the covenants set forth in
Section 6.01(a), (c), (d), (e), (g), (h) or (j) hereto.

          SECTION 4.09 Absence of Litigation. There is no material litigation,
suit, claim, action, proceeding or, to the knowledge of the Company,
investigation (an "Action") pending or, to the knowledge of the Company,
threatened in writing against the Company or any Subsidiary, by or before any
Governmental Authority. Neither the Company nor any Subsidiary is subject to any
continuing order of, consent decree, settlement agreement or similar written
agreement with, or, to the knowledge of the Company, continuing investigation
by, any Governmental Authority, or any continuing order, writ, judgment,
injunction, decree, determination or award of any Governmental Authority that
would have a Material Adverse Effect.

          SECTION 4.10 Employee Benefit Plans. (a) Section 4.10(a) of the
Disclosure Schedule lists (i) all employee benefit plans (as defined in Section
3(3) of the Employee Retirement Income Security Act of 1974, as amended
("ERISA")) and all bonus, stock option, stock purchase, restricted stock,
incentive, deferred compensation, retiree medical or life insurance,
supplemental retirement, severance or other benefit plans, programs or
arrangements, and all employment, termination, severance or other contracts or
agreements, to which the Company or any Subsidiary is a party, with respect to
which the Company or any Subsidiary has any obligation or which are maintained,
contributed to or sponsored by the Company or any Subsidiary for the benefit of
any current or former employee, officer or director of, or any current or former
consultant to, the Company or any Subsidiary, (ii) each employee benefit plan
for which the Company or any Subsidiary could incur material liability under
Section 4069 of ERISA in the event such plan has been or were to be terminated,
(iii) any material plan in respect of which the Company or any Subsidiary could
incur liability under Section 4212(c) of ERISA, and (iv) any material contracts,
arrangements or understandings between the Company or any Subsidiary, on the one
hand, and any employee of the Company or any Subsidiary, on the other hand,
relating to employee benefits or to the sale of the Company or any Subsidiary
(collectively, the "Plans"). Each Plan is in writing and the Company has made
available to Parent a true and

                                       18


complete copy of each Plan and has made available to Parent a true and complete
copy of each of the following, if any, prepared in connection with each such
Plan: (i) a copy of each trust or other funding arrangement, (ii) each summary
plan description and summary of material modifications, (iii) the most recently
filed Internal Revenue Service ("IRS") Form 5500, (iv) the most recently
received IRS determination letter for each such Plan, and (v) the most recently
prepared financial statement in connection with each such Plan. Neither the
Company nor any Subsidiary has any express or implied commitment (i) to create,
incur liability with respect to or cause to exist any other employee benefit
plan, program or arrangement, (ii) to enter into any contract or agreement to
provide compensation or benefits to any individual, or (iii) to modify, change
or terminate any Plan, other than with respect to a modification, change or
termination required by applicable Law, including ERISA or the Code, or as
contemplated by this Agreement.

          (b) None of the Plans is a multiemployer plan (within the meaning of
Section 3(37) or 4001(a)(3) of ERISA) (a "Multiemployer Plan") or a single
employer pension plan (within the meaning of Section 4001(a)(15) of ERISA) for
which the Company or any Subsidiary could incur liability under Section 4063 or
4064 of ERISA (a "Multiple Employer Plan"). None of the Plans provides for or
promises retiree medical, disability or life insurance benefits to any current
or former employee, officer or director of the Company or any Subsidiary. Each
of the Plans is subject only to the Laws of the United States or a political
subdivision thereof.

          (c) Each Plan is now and always has been operated in all material
respects in accordance with its terms and the requirements of all applicable
Laws including, without limitation, ERISA and the Code. The Company and the
Subsidiaries have performed in all material respects the obligations to be
performed by them under, and are not in any material respect in default under or
in violation of, any Plan.

          (d) For each Plan that is intended to be qualified under Section
401(a) or Section 401(k) of the Code, the IRS has issued a favorable "GUST"
determination letter (taking into account the changes in the qualification
requirements made by the Uruguay Round Agreements Act, the Small Business Job
Protection Act of 1996, the Tax Reform Act of 1997, the IRS Restructuring and
Reform Act of 1998 and the Community Renewal Relief Act of 2000) that has not
been revoked, and no events have occurred that would have or that would
reasonably be expected to have a Material Adverse Effect on the qualified status
of such Plans or a loss of the tax-exempt status of the related trust. The
Company has timely adopted all amendments to the Company's 401(k) Plan required
by the Code (and the applicable rulings and final regulations thereunder), ERISA
or other applicable law, including, without limitation, amendments required by
the Economic Growth and Tax Relief Reconciliation Act of 2001 and Section
401(a)(9) of the Code and the applicable rulings and final regulations
thereunder. To the knowledge of the Company, no fact or event has occurred since
the date of such determination letter or letters from the IRS to adversely
affect the qualified status of any such Plan or the exempt status of any such
trust.

          (e) There has not been any prohibited transaction (within the meaning
of Section 406 of ERISA or Section 4975 of the Code) with respect to any Plan.
Neither the Company nor any Subsidiary has incurred any material liability
under, arising out of or by operation of Title IV of ERISA, including any
liability in connection with (i) the termination or

                                       19


reorganization of any employee benefit plan subject to Title IV of ERISA or (ii)
the withdrawal from any Multiemployer Plan or Multiple Employer Plan, and to the
knowledge of the Company no fact or event exists that could give rise to any
such liability.

          (f) All contributions, premiums or payments required to be made prior
to the date hereof with respect to any Plan have been made in all material
respects on or before their due dates. No deduction with respect to any Plan for
income Tax purposes has been challenged or disallowed by any Governmental
Authority and no fact or event exists which could reasonably give rise to any
such challenge or disallowance, except for any failure that would not have a
Material Adverse Effect.

          (g) Except as provided in Section 3.02, (i) neither the execution of
this Agreement, shareholder approval of the principal terms of this Agreement
nor the consummation of the transactions contemplated hereby will (A) entitle
any employees of the Company or any Subsidiary to severance pay or any increase
in severance pay upon any termination of employment after the date hereof, or
(B) accelerate the time of payment or vesting or trigger any payment or funding
(through a grantor trust or otherwise) of compensation or benefits under, or
increase the amount payable or trigger any other material obligation pursuant
to, any of the Plans and (ii) none of the Plans in effect on the date of this
Agreement would result separately or in the aggregate (including as a result of
this Agreement or the transactions contemplated hereby) in the payment of any
"excess parachute payment" within the meaning of Section 280G of the Code.

          (h) The Company and each Subsidiary has timely given any and all
notices and taken any other actions required with respect to the Worker
Adjustment and Retraining Notification Act of 1988, as amended, or other similar
Laws of any state or other jurisdiction.

          SECTION 4.11 Labor and Employment Matters. There are no controversies
pending or, to the knowledge of the Company, threatened between the Company or
any Subsidiary, on the one hand, and any of their respective employees, on the
other hand, which controversies would have a Material Adverse Effect. Neither
the Company nor any Subsidiary is a party to any collective bargaining agreement
or other labor union contract applicable to persons employed by the Company or
any Subsidiary, nor, to the knowledge of the Company, are there any activities
or proceedings of any labor union to organize any such employees. There are no
unfair labor practice complaints pending against the Company or any Subsidiary
before the National Labor Relations Board or any current union representation
questions involving employees of the Company or any Subsidiary. There is no
strike, slowdown, work stoppage or lockout, or, to the knowledge of the Company,
threat thereof, by or with respect to any employees of the Company or any
Subsidiary. All individuals classified by the Company or any Subsidiary as
independent contractors have been properly classified as non-employees for
purposes of applicable Laws, except as would not be material to the Company and
its Subsidiaries taken as a whole.

          SECTION 4.12 Information Supplied. The Proxy Statement that will be
mailed to shareholders of the Company in connection with the Company
Shareholders Meeting (as defined in Section 7.01) shall not, on the date the
Proxy Statement (or any amendment or supplement thereto) is first mailed or
otherwise disseminated to shareholders of the Company and at the time of the
Company Shareholders Meeting, contain any untrue statement of a material

                                       20


fact, or omit to state any material fact required to be stated therein or
necessary in order to make the statements therein, at the time and in light of
the circumstances under which they were made, not false or misleading, or
necessary to correct any statement in any earlier communication with respect to
the solicitation of proxies for the Company Shareholders Meeting which shall
have become false or misleading. Notwithstanding the foregoing, the Company
makes no representation or warranty with respect to any information supplied by
Parent, Purchaser or any of Parent's or Purchaser's representatives for
inclusion in the foregoing documents. The Proxy Statement shall comply in all
material respects as to form with the requirements of the Exchange Act and the
rules and regulations thereunder.

          SECTION 4.13 Real Property; Title to Assets. (a) Section 4.13(a) of
the Disclosure Schedule lists each parcel of real property owned by the Company
or any Subsidiary and the location of such real property. Each parcel of real
property owned by the Company or any Subsidiary (i) is owned free and clear of
all mortgages, pledges, liens, security interests, conditional and installment
sale agreements, encumbrances, charges or other claims of third parties of any
kind, including, without limitation, any lease, license, occupancy agreement,
easement, right of way or other encumbrance to title, or any option, right of
first refusal, or right of first offer (collectively, "Liens"), other than (A)
Liens for current Taxes and assessments not yet due for which adequate reserves
have been established in accordance with GAAP, (B) inchoate Liens imposed for
construction work in progress, including mechanics' liens, workers' or
repairmen's liens, (C) Liens securing obligations under the Credit Agreement, or
(D) Liens that do not adversely affect in any material respect the use or
operation of the applicable property owned by the Company or such Subsidiary,
and (ii) is neither subject to any Order to be sold nor is being condemned,
expropriated or otherwise taken by any Governmental Authority with or without
payment of compensation therefor, nor, to the knowledge of the Company, has any
such condemnation, expropriation or taking been proposed, except as would not
have materially adversely affected the value or use of the applicable property
owned by the Company or such Subsidiary.

          (b) Section 4.13(b) of the Disclosure Schedule lists each parcel of
real property currently leased or subleased by the Company or any Subsidiary
that involves consideration in excess of $100,000 per calendar year or $500,000
in the aggregate for the remaining term of such lease or sublease (without
renewal of such lease or sublease), and the location of such real property, with
the name of the lessor and the date of the lease, sublease, assignment of the
lease, any guaranty given or leasing commissions payable by the Company or any
Subsidiary in connection therewith and each amendment to any of the foregoing
(collectively, the "Lease Documents"). True, correct and complete copies of all
Lease Documents have been made available to Parent. All such current leases and
subleases are in full force and effect, are valid and effective in accordance
with their respective terms, and there is not, under any of such leases, any
existing material default or event of default (or event which, with notice or
lapse of time, or both, would constitute a default or event of default) by the
Company or any Subsidiary or, to the Company's knowledge, by the other party to
such lease or sublease, or person in the chain of title to such leased premises,
and, to the knowledge of the Company, neither tenant nor landlord has exercised
any right to terminate such leases and subleases as a result of a default under
such leases and subleases by either tenant or landlord.

                                       21


          (c) Except as would not materially adversely affect the value or use
of the applicable property owned by the Company or such Subsidiary, (i) there
are no contractual or legal restrictions that preclude or restrict the ability
to use any real property owned by the Company or any Subsidiary or leased by the
Company or any Subsidiary pursuant to a sale-leaseback transaction for the
purposes for which it is currently being used, and (ii) there are no latent
defects or adverse physical conditions affecting the real property owned by the
Company or any Subsidiary, and improvements thereon, owned by the Company or any
Subsidiary or leased by the Company or any Subsidiary pursuant to a
sale-leaseback transaction.

          SECTION 4.14 Intellectual Property. (a) Section 4.14(a) of the
Disclosure Schedule sets forth a true and complete list of all patents, patent
application, copyright registrations and applications, trademark registrations
and applications and domain name registrations that are owned by the Company
and/or the Subsidiaries as of the date of this Agreement. The Company and/or the
Subsidiaries exclusively own each such item free and clear of encumbrances, and,
to the knowledge of the Company, each is subsisting, valid and enforceable, and
is not subject to any outstanding judgment, order or license adversely affecting
in any material respect the Company's and/or the Subsidiaries' use thereof in
the ordinary course of the Company's and/or the Subsidiaries' respective
businesses or its/their rights thereto.

          (b) The Company and the Subsidiaries own or have the rights to use all
patents, inventions, copyrights, software, trademarks, service marks, domain
names, trade dress, trade secrets and all other intellectual property rights of
any kind or nature ("Intellectual Property") used in their business as currently
conducted, which rights shall survive the execution of this Agreement and the
consummation of the Merger and the other transactions contemplated hereby,
except as would not have a Material Adverse Effect. To the knowledge of the
Company, such Intellectual Property is not being infringed by any third party.
To the knowledge of the Company, neither the conduct of the Company nor any of
the Subsidiaries infringes Intellectual Property of any third party.

          (c) The Company and the Subsidiaries have taken reasonable steps in
accordance with normal industry practice to maintain the confidentiality of
their trade secrets and other confidential Intellectual Property. To the
Company's knowledge, there has been no misappropriation of any trade secret or
other confidential information of the Company or the Subsidiaries.

          SECTION 4.15 Taxes. Except as would not have a Material Adverse
Effect, (i) the Company and each of its Subsidiaries have timely filed (or have
had filed on their behalf) all Tax Returns they were required to file, and have
paid all Taxes that have become due and payable, except such Taxes that are
being contested in good faith by appropriate proceedings and for which adequate
reserves have been provided in the relevant financial statements in accordance
with GAAP; (ii) all such Tax Returns are true, accurate and complete; (iii)
adequate reserves have been provided in the relevant financial statements as
required by GAAP for all Taxes not yet due and payable; (iv) neither the IRS nor
any other United States or non-United States taxing authority or agency has
asserted in writing or, to the knowledge of the Company, has threatened to
assert against the Company or any Subsidiary any deficiency or claim for any
Taxes; (v) there are no pending or, to the knowledge of the Company, threatened
actions, investigations, suits, Governmental Authority proceedings or audits for
the assessment or

                                       22


collection of Taxes against the Company or any Subsidiary; (vi) neither the
Company nor any Subsidiary has granted any waiver of any statute of limitations
with respect to, or any extension of a period for the assessment of, any Tax;
(vii) neither the Company nor any Subsidiary has made an election under Section
341(f) of the Code; (viii) there are no Tax Liens upon any property or assets of
the Company or any of the Subsidiaries except Liens for current Taxes not yet
due; (ix) neither the Company nor any of the Subsidiaries is a party to any
agreement, understanding, or arrangement (with any person other than the Company
and/or any of the Subsidiaries) relating to allocating or sharing of any amount
of Taxes; (x) neither the Company nor any of the Subsidiaries has any liability
for any amount of Taxes of any person other than the Company or any of its
Subsidiaries under Treasury Regulation Section 1.1502-6 (or any similar
provision of state, local or foreign Law), as a transferee or successor, or by
contract; (xi) neither the Company nor any Subsidiary has been a "distributing
corporation" or a "controlled corporation" in a distribution intended to qualify
under Section 355 of the Code within the past five years; (xii) neither the
Company nor any Subsidiary will be required to include any item of income in, or
exclude any item of deduction from, taxable income for any taxable period (or
portion thereof) ending after the Effective Time as a result of any transaction
occurring in, or a change in accounting method made for, a taxable period ending
on or before the Effective Time; (xiii) there is no material intercompany income
or gain which may in the future become taxable to the Company or any Subsidiary,
whether on disposition of particular Subsidiaries or otherwise; and (xiv)
neither the Company nor any Subsidiary has participated in "listed transactions"
or "reportable transactions" or "tax shelters" within the meaning of the Code
requiring it to file, register, prepare, produce or maintain any disclosure,
report, list or any other statement or document under Section 6111 or 6112 of
the Code, except as set forth on Section 4.15 of the Disclosure Schedule, in
which case the Company or the relevant Subsidiary has filed all disclosures and
properly registered or maintained all lists, reports and other similar documents
in compliance and as required by Section 6011, 6111, or 6112 of the Code and the
Treasury regulations issued thereunder.

          SECTION 4.16 Environmental Matters. Except as would not have a
Material Adverse Effect, (a) neither the Company nor any of the Subsidiaries has
violated or is in violation of any Environmental Law; (b) neither the Company
nor any of the Subsidiaries has received written notice of liability or is aware
of facts or circumstances reasonably likely to result in written notice of
liability, for any off-site contamination by Hazardous Substances; except, with
respect to any such notification, to the extent that such matter has been
resolved with the appropriate foreign, federal, state or local regulatory
authority or otherwise; (c) neither the Company nor any of the Subsidiaries has
received written notice of liability or is aware of facts or circumstances
reasonably likely to result in written notice of liability, under any
Environmental Law (including, without limitation, pending or threatened liens)
except, with respect to any such notification, to the extent that such matter
has been resolved with the appropriate foreign, federal, state or local
regulatory authority or otherwise; (d) each of the Company and each Subsidiary
has all permits, licenses and other authorizations required under any
Environmental Law ("Environmental Permits"); (e) each of the Company and each
Subsidiary is in compliance with its Environmental Permits; and (f) neither the
execution of this Agreement nor the consummation of the Merger will require any
investigation, remediation or other action pursuant to any applicable
Environmental Law or Environmental Permit with respect to any real property
owned or leased by the Company or any of the Subsidiaries.

                                       23


          SECTION 4.17 Rights Agreement. The Company Board has taken all action
necessary so that none of the execution or delivery of this Agreement and the
consummation of the Merger will result in (i) the occurrence of the "flip-in
event" described under Section 11(a)(ii) of the Rights Agreement, (ii) the
occurrence of the "flip-over event" described in Section 13 of the Rights
Agreement, or (iii) the rights becoming evidenced by, and transferable pursuant
to, certificates separate from the certificates representing Shares.

          SECTION 4.18 Listed Contracts. (a) Except for any default that would
not, individually or in the aggregate with any other defaults, have a Material
Adverse Effect (i) neither the Company nor any of the Subsidiaries is in default
under any Listed Contract to which the Company or any of the Subsidiaries is a
party or by which it or any of its respective properties or assets are bound
nor, to the knowledge of the Company, is any other party thereto in default
thereunder, and (ii) no event has occurred that with the lapse of time or the
giving of notice or both would constitute a default under any such Listed
Contract by the Company or any of the Subsidiaries or, to the knowledge of the
Company, any other party. No party to any such Listed Contract has given written
notice to the Company or any of the Subsidiaries of, or made a claim against the
Company or any of the Subsidiaries with respect to, any breach or default under
any such Listed Contract, in any such case, where such breach or default would
have a Material Adverse Effect. Assuming the Listed Contracts have been duly
authorized, executed and delivered by the respective other parties thereto,
except as would not have a Material Adverse Effect, the Listed Contracts are
valid, binding and enforceable obligations of the Company, the Subsidiaries and
the other parties thereto, subject to the Enforceability Exceptions. Schedule
4.18 of the Disclosure Schedule sets forth the following contracts and
agreements (the "Listed Contracts"):

          (i) each contract and agreement (other than (A) contracts and
     agreements otherwise made available or otherwise disclosed to Parent
     pursuant to the terms of this Agreement and (B) supplier and vendor
     contracts), whether or not made in the ordinary course of business, that
     contemplates an exchange of consideration with a value of more than
     $1,000,000 in the aggregate, on an annual basis, in each case determined by
     the revenue received under each such contract during the 12-month period
     ended June 30, 2005 (except for insurance services group customer
     contracts, which are based upon revenue received under each contract during
     the fiscal year ended December 31, 2004);

          (ii) all contracts and agreements under which the Company or any
     Subsidiary provides or receives laboratory management services or specimen
     collection services;

          (iii) all contracts and agreements with group purchasing
     organizations, managed care companies, and third party payors (except for
     contracts with LabCard(R) customers which shall be set forth in Section
     4.18(a) of the Disclosure Schedule pursuant to clause (i) of this Section
     4.18(a) to the extent required to be listed pursuant to such clause);

          (iv) contracts and agreements with each of the Company's top 10
     substance abuse testing customers determined by the revenue received from
     such customers during the 12-month period ended June 30, 2005;

                                       24


          (v) each of the top ten supply agreements determined by the amounts
     paid by the Company during the 12-month period ended June 30, 2005;

          (vi) all contracts and agreements under which the Company or any
     Subsidiary referred specimens to a third party for testing that involved
     payments made in excess of $1,000,000 during the fiscal year ending
     December 31, 2004;

          (vii) all contracts and agreements evidencing Indebtedness;

          (viii) any contract that would be required to be filed by the Company
     as a material contract pursuant to Item 601(b)(10) of Regulation S-K under
     the Securities Act;

          (ix) all partnership and joint venture agreements;

          (x) all contracts and agreements that (A) limit or purport to limit
     the ability of the Company or any Subsidiary or, to the Company's
     knowledge, any key executives of the Company or any Subsidiary, to compete
     in any line of business or with any person or in any geographic area or
     during any period of time (except with respect to the use of information
     pursuant to any confidentiality or non-disclosure agreement), (B) require
     the Company or any Subsidiary to use any supplier or third party for all or
     substantially all of the Company's or the Subsidiaries' requirements or
     needs, (C) limit or purport to limit the ability of the Company or any
     Subsidiary to solicit any customers or clients of the other parties
     thereto, (D) require the Company or any Subsidiary to provide to the other
     parties thereto "most favored nations" pricing, (E) require the Company or
     any Subsidiary to market or co-market any clinical laboratory services or
     other products or services of a third party, or (F) any "take-or-pay"
     contract or other similar agreement or arrangement requiring the Company or
     any Subsidiary to make a minimum payment for goods or services from third
     party suppliers irrespective of usage;

          (xi) all executory contracts, agreements and arrangements between the
     Company or any of its Subsidiaries and any other party relating to the
     acquisition or disposition by the Company or such Subsidiary (including,
     without limitation, by merger, consolidation, acquisition of stock or
     assets or any other business combination) of any corporation, partnership,
     other business organization or division thereof, in each case since
     December 31, 2002 and for an aggregate purchase price in excess of
     $5,000,000; and

          (xii) each of the top ten contracts or arrangements between the
     Company or any Subsidiary and any paramedical examination company
     determined by the revenue received under such contracts during the 12-month
     period ended June 30, 2005.

          (b) The Company has furnished or made available to Parent a true,
     complete and correct copy of all written Listed Contracts, together with
     all amendments, waivers or other changes thereto, and has given a written
     description of all oral contracts included in the Listed Contracts.

          SECTION 4.19 Insurance. The Company maintains insurance coverage with
reputable insurers, or maintains self-insurance practices, in such amounts and
covering such risks

                                       25


as are in accordance with normal industry practice for companies engaged in
businesses similar to that of the Company and its Subsidiaries taken as a whole.
The Company has not received any notice of cancellation or termination with
respect to any such insurance policy. Each such insurance policy is in full
force and effect and the premiums due thereunder have been paid as they became
due and payable. Section 4.19 of the Disclosure Schedule sets forth the premiums
paid by the Company with respect to directors' and officers' liability insurance
policies as of the date of this Agreement.

          SECTION 4.20 Interested Party Transactions. To the knowledge of the
Company, no director, officer or other affiliate of the Company or any
Subsidiary has (i) an economic interest in any person that furnishes or sells
services or products that the Company or any Subsidiary furnishes or sells; (ii)
an economic interest in any person that purchases from or sells or furnishes to
the Company, or any Subsidiary, any goods or services; (iii) a beneficial
interest in any party (other than the Company or any Subsidiary) to any Listed
Contract; or (iv) any contractual or other arrangement with the Company or any
Subsidiary (excluding employment, director, management or consulting
arrangements and benefit programs); provided, however, that ownership of no more
than two percent (2%) of the outstanding voting stock of a publicly traded
corporation shall not be deemed an "economic interest in any person" for
purposes of this Section 4.20.

          SECTION 4.21 Customers and Suppliers. Section 4.21 of the Disclosure
Schedule sets forth a true and complete list of the Company's top ten customers
of each of the risk assessment, healthcare and substance abuse testing business
segments (based on the revenue from such customers during the 12-month period
ended June 30, 2005). As of the date of this Agreement, none of the Company's
customers listed in Section 4.21 of the Disclosure Schedule accounted for more
than three percent (3%) of the Company's consolidated revenues during the
12-month period ended June 30, 2005, other than pursuant to the State Farm
Master Agreement, and since June 30, 2004, none of such customers and no
material supplier of the Company and its Subsidiaries (i) has cancelled or
otherwise terminated any contract with the Company or any Subsidiary prior to
the expiration of the contract term or (ii) to the Company's knowledge, as of
the date of this Agreement, has threatened, or indicated its intention in
writing, to cancel or otherwise terminate its relationship with the Company or
its Subsidiaries or to reduce substantially its purchase from or sale to the
Company or any Subsidiary of any products, goods or services.

          SECTION 4.22 Brokers. No broker, finder or investment banker (other
than J.P. Morgan Securities Inc.) is entitled to any brokerage, finder's or
other fee or commission in connection with the Merger based upon arrangements
made by or on behalf of the Company. The Company has heretofore furnished to
Parent a complete and correct copy of all agreements between the Company and
J.P. Morgan Securities Inc. pursuant to which such firm would be entitled to any
payment relating to the Merger.

          SECTION 4.23 Opinion of Financial Advisor. The Company has received
the written opinion of J.P. Morgan Securities Inc., dated as of the date of this
Agreement, to the effect that, as of such date, the consideration to be received
by the shareholders of the Company in the Merger is fair from a financial point
of view to such shareholders.

                                       26


                                   ARTICLE V
             REPRESENTATIONS AND WARRANTIES OF PARENT AND PURCHASER

          As an inducement to the Company to enter into this Agreement, Parent
and Purchaser hereby, jointly and severally, represent and warrant to the
Company as follows:

          SECTION 5.01 Corporate Organization. Each of Parent and Purchaser is a
corporation duly organized, validly existing and in good standing under the Laws
of the jurisdiction of its incorporation and has the requisite corporate power
and authority and all necessary governmental approvals to own, lease and operate
its properties and to carry on its business as it is now being conducted, except
where the failure to be so organized, existing or in good standing or to have
such power, authority and governmental approvals would not, individually or in
the aggregate, prohibit or materially delay consummation of the Merger or
otherwise prevent Parent or Purchaser from performing its obligations under this
Agreement.

          SECTION 5.02 Authority Relative to This Agreement. Each of Parent and
Purchaser has all necessary corporate power and authority to execute and deliver
this Agreement, to perform its obligations hereunder and to consummate the
Merger. The execution and delivery of this Agreement by Parent and Purchaser and
the consummation by Parent and Purchaser of the Merger have been duly and
validly authorized by all necessary corporate action on the part of Parent and
Purchaser, and no other corporate proceedings on the part of Parent or Purchaser
are necessary to authorize this Agreement or to consummate the Merger (other
than, with respect to the Merger, the filing and recordation of appropriate
merger documents as required by the MGBCL). This Agreement has been duly and
validly executed and delivered by Parent and Purchaser and, assuming due
authorization, execution and delivery by the Company constitutes a legal, valid
and binding obligation of each of Parent and Purchaser enforceable against each
of Parent and Purchaser in accordance with its terms.

          SECTION 5.03 No Conflict; Required Filings and Consents. (a) The
execution and delivery of this Agreement by Parent and Purchaser do not, and the
performance of this Agreement by Parent and Purchaser will not, and the
consummation of the Merger by Parent and Purchaser will not (i) conflict with or
violate the Certificate of Incorporation or By-laws of Parent or the Articles of
Incorporation or Bylaws of Purchaser, (ii) assuming that all consents, approvals
and other authorizations described in Section 5.03(b) have been obtained and
that all filings and other actions described in Section 5.03(b) have been made
or taken, conflict with or violate any Law applicable to Parent or Purchaser or
by which any property or asset of either of them is bound or affected, or (iii)
result in any breach of, or constitute a default (or an event which, with notice
or lapse of time or both, would become a default) under, or give to others any
rights of termination, amendment, acceleration or cancellation of, or result in
the creation of a Lien on any property or asset of Parent or Purchaser pursuant
to, any note, bond, mortgage, indenture, contract, agreement, lease, license,
permit, franchise or other instrument or obligation to which Parent or Purchaser
is a party or by which Parent or Purchaser or any property or asset of either of
them is bound or affected, except, with respect to clauses (ii) and (iii), for
any such conflicts, violations, breaches, defaults or other occurrences that
would not, individually or in the aggregate, prohibit or materially delay
consummation of the Merger or otherwise prevent Parent or Purchaser from
performing its obligations under this Agreement.

                                       27


          (b) The execution and delivery of this Agreement by Parent and
Purchaser do not, and the performance of this Agreement by Parent and Purchaser
will not, require any consent, approval, authorization or permit of, or filing
with or notification to, any Governmental Authority, except for (i) applicable
requirements, if any, of the Exchange Act or state securities Laws, (ii) the
pre-merger notification requirements of the HSR Act, (iii) the filing and
recordation of appropriate merger documents as required by the MGBCL, and (iv)
where the failure to obtain such consents, approvals, authorizations or permits,
or to make such filings or notifications, would not, individually or in the
aggregate, prohibit or materially delay consummation of the Merger, or otherwise
prevent Parent or Purchaser from performing its obligations under this
Agreement.

          SECTION 5.04 Information Supplied. The information supplied by Parent
for inclusion in the Proxy Statement shall not, at the date the Proxy Statement
(or any amendment or supplement thereto) is first mailed or otherwise
disseminated to shareholders of the Company, at the time of the Company
Shareholders Meeting or at the Effective Time, contain any untrue statement of a
material fact, or omit to state any material fact required to be stated therein
or necessary in order to make the statements therein, in light of the
circumstances under which they were made, not false or misleading, or necessary
to correct any statement in any earlier communication with respect to the
solicitation of proxies for the Company Shareholders Meeting which shall have
become false or misleading. Notwithstanding the foregoing, Parent and Purchaser
make no representation or warranty with respect to any information supplied by
the Company or any of its representatives for inclusion in any of the foregoing
documents. The information supplied by Parent for inclusion in the Proxy
Statement shall comply in all material respects as to form with the requirements
of the Exchange Act and the rules and regulations thereunder.

          SECTION 5.05 Financing. At the Effective Time, Parent will have
sufficient funds to permit Purchaser to consummate the Merger and pay the Merger
Consideration and the amounts payable to the holders of Stock Options pursuant
to Section 3.02.

          SECTION 5.06 Brokers. No broker, finder or investment banker (other
than Merrill Lynch & Co.) is entitled to any brokerage, finder's or other fee or
commission in connection with the Merger based upon arrangements made by or on
behalf of Parent or Purchaser.

          SECTION 5.07 Ownership of Shares. None of Parent, any of its
subsidiaries or any of their respective controlled affiliates beneficially owns
any Shares.

                                   ARTICLE VI
                     CONDUCT OF BUSINESS PENDING THE MERGER

          SECTION 6.01 Conduct of Business by the Company Pending the Merger.
The Company agrees that, between the date of this Agreement and the Effective
Time, except as required by Law, as otherwise specifically contemplated by this
Agreement or as set forth in the Disclosure Schedule, unless Parent shall
otherwise agree in writing (which agreement shall not be unreasonably withheld
or delayed), the businesses of the Company and the Subsidiaries shall be
conducted in all material respects only in the ordinary course of business and
in a manner

                                       28


consistent with past practice; and the Company shall use its reasonable best
efforts to preserve substantially intact the business organization of the
Company and the Subsidiaries, to keep available the services of the current
officers, employees and consultants of the Company and the Subsidiaries and to
preserve the current relationships of the Company and the Subsidiaries with
customers, suppliers and other persons with which the Company or any Subsidiary
has significant business relations. By way of amplification and not limitation,
except as expressly contemplated by this Agreement and Section 6.01 of the
Disclosure Schedule, neither the Company nor any Subsidiary shall, between the
date of this Agreement and the Effective Time, directly or indirectly, do, or
propose to do, any of the following without the prior written consent of Parent
(which consent shall not be unreasonably withheld or delayed):

          (a) amend or otherwise change its Articles of Incorporation or Bylaws;

          (b) (i) issue, sell, pledge, dispose of, grant or encumber, or
     authorize the issuance, sale, pledge, disposition, grant or encumbrance of,
     any shares of capital stock of the Company or any Subsidiary, or any
     Company Stock Options or any options, warrants, convertible securities or
     other rights of any kind to acquire any shares of such capital stock, or
     any other ownership interest (including, without limitation, any phantom
     interest) of the Company or any Subsidiary (except for the issuance of
     shares of Common Stock upon exercise of outstanding Company Stock Options
     or upon conversion of the Debentures) or (ii) sell, pledge, dispose of,
     encumber, or authorize the sale, pledge, disposition or encumbrance of, any
     assets of the Company or any Subsidiary, except (x) immaterial assets in
     the ordinary course of business and in a manner consistent with past
     practice or (y) assets held for resale;

          (c) authorize, declare, set aside, make or pay any dividend or other
     distribution, payable in cash, stock, property or otherwise, with respect
     to any of its capital stock, except for dividends by any direct or wholly
     owned Subsidiary to the Company or any other Subsidiary;

          (d) reclassify, combine, split, subdivide or redeem, or purchase or
     otherwise acquire, directly or indirectly, any of its capital stock or that
     of any Subsidiary, other than in connection with the exercise of employee
     stock options or the purchase of stock of LabOne of Ohio, Inc. from the
     Ohio Minority Holders pursuant to the terms of existing agreements with the
     Ohio Minority Holders;

          (e) (i) acquire (including, without limitation, by merger,
     consolidation, or acquisition of stock or assets or any other business
     combination) any business, corporation, partnership, other business
     organization or any division thereof ; (ii) repurchase, repay, cancel or
     incur any indebtedness for borrowed money or issue any debt securities or
     assume, guarantee or endorse, or otherwise become responsible for, the
     obligations of any person, or make any loans or advances or grant any
     security interest in any of its assets, except for the incurrence of any
     indebtedness that does not exceed $1,000,000 individually or $1,500,000 in
     the aggregate and that arises in the ordinary course of business and is
     consistent with past practice (which shall be deemed to include the renewal
     of and borrowings and repayments under the Credit Agreement); (iii) enter
     into any contract or agreement that requires the payment of more than
     $1,500,000 during

                                       29


     the term of such contract or agreement other than contracts or agreements
     that are terminable pursuant to the terms of such contract upon not more
     than 90 days' notice without penalty (it being agreed and understood that
     retroactive price increases permitted under the terms of such agreement
     shall not be considered for purposes of determining the aggregate payments
     required under any such contract or agreement or constitute a penalty under
     any such contract or agreement); (iv) (x) with respect to fiscal year 2005,
     authorize, or make any commitment with respect to, capital expenditures
     outside of the Company's fiscal year 2005 capital expenditure budget,
     attached hereto as Schedule 6.01(e), other than any individual capital
     expenditure in excess of $500,000 or aggregate capital expenditures in
     excess of $1,500,000 for the Company and its Subsidiaries, taken as a
     whole, and (y) with respect to fiscal year 2006, authorize, or make any
     commitment with respect to, capital expenditures, which in the case of any
     individual capital expenditure is in excess of $1,500,000 or which in the
     case of aggregate capital expenditures is in excess of $5,000,000 for the
     Company and the Subsidiaries, taken as a whole, in any fiscal quarter; or
     (v) enter into or amend any contract, agreement, commitment or arrangement
     with respect to any matter set forth in this Section 6.01(e); except in
     each case as may reasonably be required in connection with the construction
     of the Cincinnati Facility as disclosed in Section 6.01(e) of the
     Disclosure Schedule;

          (f) except in each case as required to comply with any Plan, written
     policy or agreement in effect on the date of this Agreement that has been
     previously disclosed in writing to Parent, increase the compensation
     payable or to become payable or the benefits provided to its directors,
     officers or employees, except for increases in the ordinary course of
     business and consistent with past practice in salaries or wages of
     employees of the Company or any Subsidiary who are not directors or
     officers of the Company or any Subsidiary, or grant any severance or
     termination pay to, or enter into any employment or severance agreement
     with (other than employment offer letters which do not provide for
     severance on termination provisions), any director, officer or other
     employee of the Company or of any Subsidiary, or establish, adopt, enter
     into or amend any collective bargaining, bonus, profit-sharing, thrift,
     compensation, stock option, restricted stock, pension, retirement, deferred
     compensation, employment, termination, severance or other plan, agreement,
     trust, fund, policy or arrangement for the benefit of any director, officer
     or employee;

          (g) change any of the accounting principles, policies or procedures
     used by it other than as required by GAAP or applicable Law, which Law
     shall have been enacted or effective after the date hereof;

          (h) make, revoke or change any express or deemed Tax election or
     method of Tax accounting, settle or compromise any material liability with
     respect to Taxes, consent to any material claim or material assessment
     relating to Taxes or waive the statute of limitations for any such claim or
     assessment;

          (i) subject to Section 6.01(e)(ii), pay, discharge or satisfy any
     claim, liability or obligation (absolute, accrued, asserted or unasserted,
     contingent or otherwise), other than in the ordinary course of business and
     consistent with past practice;

                                       30


          (j) amend or modify in any material respect or consent to the
     termination of any Listed Contract, or waive in any material respect any
     rights of the Company or any Subsidiary thereunder, other than in the
     ordinary course of business and consistent with past practice;

          (k) settle any material Action;

          (l) sell, transfer, or grant any license or sublicense of, or execute
     any agreement with respect to, any right under or with respect to any
     material Intellectual Property held by the Company or any of its
     Subsidiaries or disclose any Intellectual Property held by the Company or
     any of its Subsidiaries in the form of confidential information to any
     third party, except in the ordinary course of business and consistent with
     past practice; or

          (m) announce an intention, enter into any formal or informal
     agreement, or otherwise make a commitment, to do any of the foregoing.

                                  ARTICLE VII
                              ADDITIONAL AGREEMENTS

          SECTION 7.01 Company Shareholders Meeting. The Company shall duly
call, give notice of, convene and hold a meeting of its shareholders, as
promptly as reasonably practicable following the execution of this Agreement for
the purpose of approving this Agreement (the "Company Shareholders Meeting").
Subject to Section 7.04(c), the Company shall (i) include in the Proxy
Statement, and not subsequently withdraw or modify in any manner adverse to
Purchaser or Parent, the recommendation of the Company Board that the
shareholders of the Company approve this Agreement, and (ii) use its reasonable
best efforts to obtain the Requisite Shareholder Approval, including, without
limitation, to the extent permitted under applicable Law, postponing or
adjourning the Company Shareholders Meeting to obtain a quorum or to solicit
additional proxies.

          SECTION 7.02 Proxy Statement. The Company shall, as promptly as
reasonably practicable following the execution of this Agreement (but in any
event within 30 days thereafter unless the parties shall otherwise agree), file
the Proxy Statement with the SEC under the Exchange Act, and shall use its
reasonable best efforts to have the Proxy Statement cleared by the SEC as
promptly as practicable. Parent, Purchaser and the Company shall cooperate with
each other in the preparation of the Proxy Statement, and the Company shall
notify Parent of the receipt of any comments of the SEC with respect to the
Proxy Statement and of any requests by the SEC for any amendment or supplement
thereto or for additional information and shall provide to Parent promptly
copies of all correspondence between the Company or any representative of the
Company and the SEC with respect thereto. The Company shall give Parent and its
counsel a reasonable opportunity to review and comment on the Proxy Statement,
including all amendments and supplements thereto, prior to such documents being
filed with the SEC or disseminated to holders of Shares and shall give Parent
and its counsel a reasonable opportunity to review and comment on all responses
to requests for additional information and replies to comments prior to their
being filed with, or sent to, the SEC. If at any time prior to the Company
Shareholders Meeting, there shall occur any event with respect to the Company,
Parent

                                       31


or any of their Subsidiaries, or with respect to any information provided
by the Company or Parent for inclusion in the Proxy Statement, which event is
required by applicable Law to be described in an amendment or supplement to the
Proxy Statement, such amendment or supplement shall be promptly filed with the
SEC, as required by applicable Law, and disseminated to holders of Shares, as
applicable. Each of the Company, Parent and Purchaser agrees to use its
reasonable best efforts, after consultation with the other parties hereto, to
respond promptly to all such comments of and requests by the SEC and to cause
the Proxy Statement and all required amendments and supplements thereto to be
mailed, as may be required, to the holders of Shares entitled to vote at the
Company Shareholders Meeting at the earliest practicable time.

          SECTION 7.03 Access to Information; Confidentiality. (a) Except as
prohibited by applicable Law and subject to any applicable privileges (including
the attorney-client privilege), from the date hereof until the Effective Time,
upon reasonable prior notice, the Company shall, and shall cause the
Subsidiaries and the officers, directors, employees, auditors and agents of the
Company and the Subsidiaries to, afford the officers, employees and agents of
Parent and Purchaser reasonable access during normal business hours to the
officers, employees, agents, properties, offices, plants and other facilities,
books and records of the Company and each Subsidiary, and the Company shall
furnish Parent and Purchaser with such financial, operating and other data and
information as Parent or Purchaser, through its officers, employees or agents,
may reasonably request; provided that such investigation shall not unreasonably
interfere with the business or operations of the Company or any Subsidiary.

          (b) All information obtained by Parent or Purchaser pursuant to this
Section 7.03 shall be kept confidential in accordance with the confidentiality
agreement, dated April 13, 2005, and Supplement to Confidentiality Agreement,
dated July 14, 2005 (the "Confidentiality Agreement"), between Parent and the
Company.

          (c) No investigation pursuant to this Section 7.03 shall affect any
representation or warranty in this Agreement of any party hereto or any
condition to the obligations of the parties hereto.

          SECTION 7.04 No Solicitation of Transactions. (a) The Company agrees
that neither it nor any Subsidiary nor any of the directors, officers or
employees of it or any Subsidiary will, and that it will instruct and use its
reasonable best efforts to cause its and its Subsidiaries' directors, officers,
employees, agents, advisors and other representatives (including, without
limitation, any investment banker, attorney or accountant retained by it or any
Subsidiary) not to, directly or indirectly, (i) solicit, initiate or knowingly
encourage (including by way of furnishing nonpublic information), or take any
other action to knowingly facilitate, any inquiries or the making of any
proposal or offer (including any proposal or offer to its shareholders) that
constitutes, or may reasonably be expected to lead to, any Competing
Transaction, or (ii) enter into or maintain or continue discussions or
negotiations with any person or entity in furtherance of such inquiries or to
obtain a proposal or offer for a Competing Transaction, or (iii) agree to,
approve, endorse or recommend any Competing Transaction or enter into any letter
of intent or other contract, agreement or commitment contemplating or otherwise
relating to any Competing Transaction, or (iv) authorize or permit any of the
officers, directors or employees of the Company or any of its Subsidiaries, or
any investment banker,

                                       32


financial advisor, attorney, accountant or other representative retained by the
Company or any of its Subsidiaries, to take any such action. The Company shall
notify Parent as promptly as practicable (and in any event within one business
day after the Company attains knowledge thereof), orally and in writing, if any
proposal or offer, or any inquiry or contact with any person with respect
thereto, regarding a Competing Transaction is made, specifying the material
terms and conditions thereof and the identity of the party making such proposal
or offer or inquiry or contact (including material amendments or proposed
material amendments). The Company shall, and shall direct or cause its and its
Subsidiaries' directors, officers, employees, representatives and agents to,
immediately cease and terminate any discussions or negotiations with any parties
that may have been conducted heretofore with respect to a Competing Transaction.
The Company shall not release any third party from, or waive any provision of,
any confidentiality or standstill agreement to which it is a party and the
Company also agrees to promptly request each person that has heretofore executed
a confidentiality agreement in connection with its consideration of acquiring
(whether by merger, acquisition of stock or assets or otherwise) the Company or
any Subsidiary, if any, to return (or if permitted by the applicable
confidentiality agreement, destroy) all confidential information heretofore
furnished to such person by or on behalf of the Company or any Subsidiary and,
if requested by Parent, to use its reasonable best efforts to enforce such
person's obligation to do so. The Company shall not take any action to make the
provisions of Section 351.407, Section 351.015 or Section 351.459 of the MGBCL
and Article X of the Company's Articles of Incorporation inapplicable to any
transaction other the transactions contemplated by this Agreement.
Notwithstanding anything to the contrary contained in this Agreement, (x)
neither the Company nor the Company Board shall be prohibited from taking and
disclosing to its shareholders a position contemplated by Rule 14d-9 and Rule
14e-2(a) or Item 1012(a) of Regulation M-A promulgated under the Exchange Act
(or any similar communication to shareholders in connection with the making or
amendment of a tender offer or exchange offer) or from making any disclosure
required under applicable Law or the rules of the Nasdaq National Market, and
(y) any "stop-look-and-listen" communication by the Company or the Company Board
to the shareholders of the Company pursuant to Rule 14d-9(f) promulgated under
the Exchange Act (or similar communication to the shareholders of the Company in
connection with the making or amendment of a tender offer or exchange offer
containing the substance of a "stop-look-and-listen" communication pursuant to
such Rule 14d-9(f)) shall not be considered a Change in the Company
Recommendation (as hereinafter defined) or an approval, recommendation or
proposal to approve or recommend any Competing Transaction.

          (b) Notwithstanding anything to the contrary in this Section 7.04,
prior to obtaining the Requisite Shareholder Approval, in the event a person (a
"Third Party") makes an unsolicited, written, bona fide proposal or offer
regarding a Competing Transaction, (A) the Company and its Subsidiaries,
directors, officers, employees, agents, advisors and other representatives
(including, without limitation, any investment broker, attorney or accountant
retained by the Company or any Subsidiary) may furnish information to such Third
Party (it being understood that any such information furnished to a Third Party
not previously furnished to Parent shall be contemporaneously furnished to
Parent), and enter into and conduct discussions and negotiations with such Third
Party, regarding such proposal or offer, and (B) the Company may release the
Third Party from, or waive any provision of, any confidentiality or standstill
agreement to which it is a party to the extent reasonably necessary to permit
the Third Party to make and pursue the proposal or offer; provided, however,
that, prior to furnishing any

                                       33


such information, conducting any such discussions and negotiations or releasing
or waiving any such provisions, the Company Board shall have (i) determined, in
its good faith judgment (after having received the advice of its financial
advisor and outside legal counsel (who may be the Company's regularly engaged
independent legal counsel)), that such proposal or offer constitutes or may be
reasonably expected to lead to a Superior Proposal, (ii) determined, in its good
faith judgment after consultation with independent legal counsel (that may be
the Company's regularly engaged independent legal counsel), that a failure to
furnish such information, enter into such discussions and negotiations or
release or waive such provisions would be inconsistent with its fiduciary duties
to the Company or its shareholders under applicable Law, (iii) provided prior
written notice to Parent of its intent to furnish information to, or enter into
discussions with, the Third Party, and (iv) obtained from the Third Party an
executed confidentiality agreement on terms no less favorable to the Company in
all material respects than those contained in the Confidentiality Agreement (it
being understood that such confidentiality agreement and any related agreements
shall not include any provision calling for any exclusive right to negotiate
with such party or having the effect of prohibiting the Company from satisfying
its obligations under this Agreement).

          (c) Except as set forth in this Section 7.04(c), neither the Company
Board nor any committee thereof shall withdraw or modify, or propose to withdraw
or modify, in a manner adverse to Parent or Purchaser, the approval or
recommendation by the Company Board or any such committee of this Agreement and
the Merger (a "Change in the Company Recommendation") or approve or recommend,
or cause or permit the Company to enter into any letter of intent, agreement or
obligation with respect to, any Competing Transaction. Notwithstanding the
foregoing or anything else to the contrary in this Section 7.04(c), prior to
obtaining the Requisite Shareholder Approval, if the Company Board has
determined, in its good faith judgment (after having received the advice of its
financial advisor and outside legal counsel (who may be the Company's regularly
engaged independent legal counsel)), that an unsolicited, written, bona fide
offer from a Third Party constitutes a Superior Proposal, then the Company may
terminate this Agreement pursuant to Section 9.01(h) and enter into a definitive
agreement with respect to such Superior Proposal; provided, however, that, (x)
prior to taking any such action contemplated by this Section 7.04(c), the
Company Board shall have determined in its good faith judgment after
consultation with independent legal counsel (who may be the Company's regularly
engaged independent legal counsel), that a failure to take any such action would
be inconsistent with its fiduciary duties to the Company or its shareholders
under applicable Law; (y) prior to entering into a definitive agreement for such
a Superior Proposal (excluding a confidentiality agreement of the type
referenced in Section 7.04(b)), the Company notifies Parent, in writing at least
three business days prior to doing so, of its intention to enter into such
definitive agreement, specifying the material terms of such proposed definitive
agreement and identifying the person making such Superior Proposal, and Parent
does not make, within three business days of receipt of such written
notification, an offer that the Company Board determines in good faith (after
having received the advice of its financial advisor and outside legal counsel
(who may be the Company's regularly engaged independent legal counsel)) is at
least as favorable from a financial point of view to the shareholders of the
Company as such Superior Proposal, it being understood that the Company shall
not enter into any definitive agreement with respect to such Superior Proposal
prior to the expiration of such three business day period; and (z) the Company
shall pay the Fee required under Section 9.03(a)(ii) of this Agreement to Parent
simultaneously with any termination of this Agreement in accordance with

                                       34


the terms of this Section 7.04(c). In addition, notwithstanding the foregoing or
anything else to the contrary in this Section 7.04, the Company Board may make a
Change in the Company Recommendation if it determines, in its good faith
judgment after consultation with independent legal counsel (who may be the
Company's regularly engaged independent legal counsel), that to do otherwise
would be inconsistent with its fiduciary duties to the Company or its
shareholders under applicable Law.

          SECTION 7.05 Employee Benefits Matters. (a) For a period of one year
from and after the Effective Time, Parent shall cause the Surviving Corporation
and its subsidiaries to honor in accordance with their terms (without amendment
or modification in a manner adverse to the participants therein) all contracts,
agreements, arrangements, policies, plans and commitments of the Company and the
Subsidiaries as in effect immediately prior to the Effective Time that are
applicable to any current or former employees or directors of the Company or any
Subsidiary; provided, however, that Parent and the Surviving Corporation shall
not be required to provide an employer stock fund in any defined contribution
plan, or to make any matching or other contributions to such plans in stock;
provided, further, that after the first anniversary of the Effective Time,
Parent and the Surviving Corporation or any of Parent's subsidiaries shall not
be prohibited from amending, modifying or terminating any such contracts,
agreements, arrangements, policies, plans and commitments in accordance with
their terms. Employees of the Company or any Subsidiary (the "Company
Employees") shall receive credit for service accrued prior to the Effective Time
with the Company or any Subsidiary ("Pre-Closing Service") for purposes of
eligibility to participate and vesting (but not for benefit accruals) under any
employee benefit plan, program or arrangement established or maintained by
Parent or any of its subsidiaries (including the Surviving Corporation) that is
extended to the Company Employees; provided, however, that such crediting of
service shall not operate to duplicate any benefit or the funding of any such
benefit. In addition, Parent and the Surviving Corporation shall waive, or cause
to be waived, any limitations on benefits relating to any pre-existing
conditions to the same extent such limitations are waived under any comparable
plan of Parent or its subsidiaries and recognize, for purposes of annual
deductible, co-payment and out-of-pocket limits under its medical and dental
plans, deductible, co-payment and out-of-pocket expenses paid by employees of
the Company and its Subsidiaries in the respective plan year in which the
Effective Time occurs; and provided, further, however, that (i) all Pre-Closing
Service shall be counted for purposes of determining the level of benefits under
any vacation or severance plan following the Effective Time established or
maintained by Parent or any of its subsidiaries (including the Surviving
Corporation) that is extended to Company Employees and (ii) following the
Effective Time, all employees of the Company and the Subsidiaries shall be
entitled to all unused vacation time accrued as of the Effective Time.
Notwithstanding any of the foregoing to the contrary, during the one-year period
following the Effective Time, Parent may cause the Surviving Corporation and the
other subsidiaries of Parent to provide to certain employees of the Company and
the Subsidiaries all employee benefit plans, programs or arrangements of Parent
or any of its subsidiaries available to similarly situated employees of Parent
and its subsidiaries; provided that the employees of the Company and the
Subsidiaries receive benefits under such employee benefit plans, programs or
arrangements that are not less favorable than the benefits provided to similarly
situated employees of Parent and its subsidiaries, in lieu of the employee
benefit plans, programs or arrangements of the Company and the Surviving
Corporation.

                                       35


          (b) Section 7.05 of the Disclosure Schedule sets forth, with respect
to certain executive officers of the Company, the cash severance payment that
would be due to such executive officer under such person's employment agreement
with the Company upon the termination of such person's employment with the
Company after a Change of Control (as defined therein). At the Effective Time,
without limiting the rights of such executive officer under such person's
agreements with the Company, the Surviving Corporation will pay to such
executive officer, pursuant to the employment agreement between the Company and
such executive officer, the amount of the cash severance payment set forth
opposite such person's name in Section 7.05 of the Disclosure Schedule.

          SECTION 7.06 Directors' and Officers' Indemnification and Insurance.
(a) The Articles of Incorporation and Bylaws of the Surviving Corporation shall
contain provisions no less favorable with respect to indemnification than those
set forth in the Company's Articles of Incorporation and Bylaws, which
provisions shall not be amended, repealed or otherwise modified for a period of
six years from the Effective Time in any manner that would affect adversely the
rights thereunder of individuals who, at or prior to the Effective Time, were
directors, officers, employees, fiduciaries or agents of the Company, unless
such modification shall be required by Law.

          (b) Parent shall maintain in effect for six years from the Effective
Time directors' and officers' liability insurance covering those persons who are
currently covered on the date of this Agreement by the current directors' and
officers' liability insurance policies maintained by the Company (provided that
Parent may substitute therefor policies of at least the same coverage containing
terms and conditions that are not, in the aggregate, less favorable to any
beneficiary thereof) with respect to matters existing or occurring prior to the
Effective Time; provided, however, that in no event shall Parent be required to
expend pursuant to this Section 7.06(b) more than an amount equal to 300% of
current annual premiums paid by the Company for such insurance; provided
further, however, that, if the amount of premium necessary to maintain or
procure such insurance coverage exceeds such maximum amount, Parent shall
maintain or procure, for such six-year period, the most advantageous policies of
directors' and officers' insurance obtainable for a premium equal to that
maximum amount. Nothing contained in this Section 7.06(b) or otherwise in this
Agreement is intended to or shall relieve any of the Company's existing
insurance carriers from any obligations that such carriers now have or may in
the future have relating to the Company, its Subsidiaries and any of their
respective officers and directors.

          (c) In addition to the other rights provided for in this Section 7.06
and not in limitation thereof (but without in any way limiting or modifying the
obligations of any insurance carrier contemplated by Section 7.06(b) of this
Agreement), for six years from and after the Effective Time, Parent shall, to
the fullest extent permitted by the MGBCL as of the date hereof (assuming the
MGBCL were applicable), indemnify and hold harmless (and release from any
liability to the Surviving Corporation or any of their respective subsidiaries)
the persons who, at or prior to the Effective Time, were officers or directors
of the Company or any Subsidiary or served at the request of the Company as a
director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise (the "Indemnitees") against all expenses
(including reimbursement for reasonable fees and expenses incurred in advance of
the final disposition of any action, suit or proceeding), losses, claims,
damages, judgments, fines and

                                       36


amounts paid in settlement that are actually and reasonably incurred by the
Indemnitee in connection with any threatened, pending or completed action, suit
or proceeding, whether criminal, civil, administrative or investigative, that
related to an event, act or omission which occurred prior to the Effective Time
by reason of the fact that such person was at or prior to the Effective Time a
director or officer of the Company or any of its current or former Subsidiaries
(collectively, an "Indemnifiable Claim"). In the event any Indemnifiable Claim
is asserted or made within such six-year period, all rights to indemnification
shall continue until such claim is disposed of or all judgments, orders, decrees
or other rulings in connection with such claim are fully satisfied.

          (d) In addition to the other rights provided for in this Section 7.06,
and not in limitation thereof, the Surviving Corporation, Parent and the Company
agree that all individual indemnity agreements between the Company and any
Indemnitees, as in effect on the date hereof, set forth in Section 4.18 or
Section 4.20 of the Disclosure Schedule, copies of which have been provided to
Parent prior to the date hereof, shall survive the Effective Time and continue
in full force and effect in accordance with their terms.

          (e) The provisions of this Section 7.06 will survive the Effective
Time and are intended for the benefit of, and will be enforceable by, each
Indemnitee and his or her heirs and representatives. Parent will pay or cause to
be paid all expenses, including reasonable fees and expenses of legal counsel,
that an Indemnitee may incur in enforcing the indemnity and other obligations
provided for in this Section 7.06 (subject to reimbursement if the Indemnitee is
subsequently determined not to be entitled to indemnification under Section
7.06).

          (f) In the event Parent or any of its successors or assigns (i)
consolidates with or merges into any other person and shall not be the
continuing or surviving corporation or entity of such consolidation or merger or
(ii) transfers all or substantially all of its properties and assets to any
person, then, and in each such case, proper provision shall be made so that the
successors and assigns of Parent shall assume the obligations set forth in this
Section 7.06.

          SECTION 7.07 Notification of Certain Matters. The Company shall give
prompt notice to Parent, and Parent shall give prompt notice to the Company, of
(a) the occurrence, or non-occurrence, of any event the occurrence, or
non-occurrence, of which reasonably could be expected to cause any
representation or warranty contained in this Agreement to be untrue or
inaccurate in any material respect, (b) any failure of the Company, Parent or
Purchaser, as the case may be, to comply with or satisfy any covenant or
agreement to be complied with or satisfied by it hereunder and (c) any other
material development relating to the Company or the Subsidiaries; provided,
however, that the delivery of any notice pursuant to this Section 7.07 shall not
limit or otherwise affect the remedies available hereunder to the party
receiving such notice; provided further, however, that a failure to comply with
this Section 7.07 will not constitute the failure of any condition set forth in
Article VIII or Article IX to be satisfied unless the underlying event would
independently result in the failure of a condition set forth in Article VIII or
Article IX to be satisfied.

          SECTION 7.08 Further Action; Reasonable Efforts. (a) Upon the terms
and subject to the conditions of this Agreement (i) each of the parties hereto
shall make promptly its respective filings, and thereafter make any other
required submissions, under the HSR Act with

                                       37


respect to the Merger and (ii) each of the parties hereto shall use its
reasonable best efforts to take, or cause to be taken, all appropriate action,
and to do, or cause to be done, all things reasonably necessary, proper or
advisable under applicable Laws to consummate and make effective the Merger as
promptly as practicable, including, without limitation, using its reasonable
best efforts to obtain all Permits, consents, approvals, authorizations,
qualifications and Orders of Governmental Authorities as are necessary for the
consummation of the Merger.

          (b) Without limiting the generality of the foregoing, each of the
Company and Parent shall, in no event later than ten business days following the
date hereof, file with the United States Federal Trade Commission (the "FTC")
and the United States Department of Justice (the "DOJ") the notification and
report form ("HSR Filing") pursuant to the HSR Act, required for the
transactions contemplated hereby. Each party's HSR Filing shall comply in all
material respects with the requirements of the HSR Act, and the Company and
Parent shall request early termination of the waiting period required by the HSR
Act. Each of the Company and Parent shall, as promptly as practicable, provide
to the FTC, DOJ and each and every federal, state, local or foreign governmental
entity with jurisdiction over enforcement of any applicable antitrust or
competition laws all non-privileged information and documents requested by such
Governmental Authority or that is reasonably necessary or advisable to permit
consummation of the transactions. Subject to applicable Law, each of the Company
and Parent shall inform the other promptly of any communication made by or on
behalf of such party to (including permitting the other party to review such
communication in advance), or received from, any Governmental Authority relating
to this Agreement or the transactions contemplated hereby and shall furnish to
the other such information and assistance as the other may reasonably request in
connection with its preparation of any filing, submission or other act that is
necessary or advisable to permit consummation of the transactions under
applicable Law. Subject to applicable Law, each party shall furnish the other
party with copies of all substantive or otherwise material correspondence,
filings, and written communications between such party and its affiliates and
their respective representatives on the one hand, and any Governmental Authority
on the other hand, with respect to this Agreement and the transactions
contemplated hereby. Neither the Company nor Parent or Purchaser shall agree to
participate in any meeting with any Governmental Authority in respect of any
filings, investigation or other inquiry relating to this Agreement or the
transactions contemplated hereby unless it consults with the other party in
advance, and to the extent permitted by such Governmental Authority, gives the
other party the opportunity to attend and participate thereat. The Company and
Parent shall keep each other timely apprised of the status of any communications
with, and any inquiries or requests for additional information from, any
Governmental Authority relating to this Agreement or the transactions
contemplated hereby.

          (c) Parent agrees to use its reasonable best efforts to avoid, resolve
or eliminate each and every objection raised by the FTC, DOJ or any state
antitrust Governmental Authority to the Merger asserted, or suit challenging the
Merger instituted, or other impediment to the Merger under any antitrust or
competition Law, so as to enable the parties to consummate the Merger as
promptly as practicable. For purposes of this Section 7.08, "reasonable best
efforts" shall include Parent committing to and effecting as promptly as
practicable, by consent decree, hold separate orders, or otherwise, the sale,
divestiture or disposition of such of its and its affiliates' assets or
operations, and/or of the assets or operations to be acquired by it pursuant to
the Merger, as is required to be sold, divested or disposed of, including
entering into any

                                       38


agreements required to be entered into by any Governmental Authority in
connection therewith, in order to obtain any required regulatory approval or to
avoid the commencement of any suit or proceeding seeking, and/or to avoid entry
of, and/or to effect the dissolution of, any decree, Order, judgment,
injunction, temporary restraining order or other Order that would have the
effect of materially delaying or prohibiting the consummation of the Merger;
provided that, anything herein to the contrary notwithstanding, in no event
shall Parent be required to hold separate, sell, divest or dispose of any assets
or operations owned by Parent or its affiliates or by the Company or its
affiliates, which individually or collectively produced aggregate revenues in
calendar year 2004 in excess of the Specified Amount or hold separate, sell,
divest or dispose of any full service laboratory.

          (d) Without limiting the Company's rights under Section 7.04, neither
party shall or shall permit its subsidiaries to consummate another transaction
or enter into an agreement with respect to another transaction or take any other
action if the intent or reasonably likely anticipated consequence of such
transaction or action is, or would be, to cause any Governmental Authority to
delay or not grant approval of, or to take legal action to seek to prevent, the
consummation, in whole or in part, of the transactions contemplated by this
Agreement.

          (e) Parent's and the Company's obligations under this Section 7.08
shall include the obligation to use their respective reasonable best efforts to
defend any lawsuits or other legal proceedings, whether judicial or
administrative, challenging the consummation of the Merger or the other
transactions contemplated hereby, including using their respective reasonable
best efforts to seek to have any stay or other injunctive relief which would
prohibit or materially delay or impair the consummation of the transactions
contemplated by this Agreement entered by any court or other Governmental
Authority reversed on appeal or vacated.

          (f) Each of the parties shall use its reasonable best efforts to take,
or cause to be taken, all appropriate action, and to do, or cause to be done,
all things reasonably necessary, proper or advisable to obtain all consents or
approvals required from third parties other than Governmental Authorities in
order to consummate the transactions contemplated hereby as promptly as
practicable.

          SECTION 7.09 Obligations of Purchaser. Parent shall take all action
necessary to cause Purchaser to perform its obligations under this Agreement and
to consummate the Merger on the terms and subject to the conditions set forth in
this Agreement. Parent unconditionally guarantees the full and complete
performance by Purchaser or the Surviving Corporation, as applicable, of its
respective obligations under this Agreement and shall be jointly and severally
liable with Purchaser for any breach of any covenant or obligation of Purchaser
or the Surviving Corporation, as applicable, under this Agreement.

          SECTION 7.10 Public Announcements. The initial press release relating
to this Agreement shall be a joint press release the text of which has been
agreed to by each of Parent and the Company. Thereafter, unless otherwise
required by applicable Law or the requirements of the New York Stock Exchange or
the NASDAQ National Market, each of Parent and the Company shall use its
reasonable best efforts to consult with each other before issuing any press
release or otherwise making any public statements with respect to this Agreement
or the Merger;

                                       39


provided, however, that this Section 7.10 shall terminate in the event the
Company Board shall have effected a Change in the Company Recommendation.

                                  ARTICLE VIII
                            CONDITIONS TO THE MERGER

          SECTION 8.01 Conditions to the Obligations of Parent, Purchaser and
the Company. The obligations of Parent, Purchaser and the Company to consummate
the Merger shall be subject to the satisfaction, at or prior to the Effective
Time, of the following conditions:

          (a) Shareholder Approval. This Agreement shall have been approved by
     the requisite affirmative vote of the shareholders of the Company in
     accordance with the MGBCL and the Company's Articles of Incorporation.

          (b) Antitrust Waiting Period. Any waiting period (and any extension
     thereof) applicable to the consummation of the Merger under the HSR Act
     shall have expired or been terminated.

          (c) No Order. No Governmental Authority shall have enacted, issued,
     promulgated, enforced or entered any Law or Order that is then in effect
     and has the effect of making consummation of the Merger illegal or
     otherwise prohibiting consummation of the Merger.

          SECTION 8.02 Conditions to the Obligations of the Company. The
obligations of the Company to effect the Merger shall be subject to the
satisfaction or written waiver, at or prior to the Effective Time, of the
following conditions:

          Representations and Warranties. (i) (x) Each of the representations
     and warranties of Parent and Purchaser contained in this Agreement that is
     not qualified as to "materiality" (other than the representation and
     warranty contained in Section 5.05 of this Agreement) shall be true and
     correct in all material respects as of the date of this Agreement and as of
     the Effective Time, except to the extent that such representations and
     warranties are made as of another date, in which case such representations
     and warranties shall be true and correct in all material respects as of
     such other date; and (y) each of the representations and warranties of
     Parent and Purchaser that is qualified as to "materiality" shall be true
     and correct in all respects as of the date of this Agreement and as of the
     Effective Time, except to the extent such representations and warranties
     are made as of another date, in which case such representations and
     warranties shall be true and correct as of such other date, except in the
     case of either (x) or (y), where any failure of such representations and
     warranties to be true and correct would not, individually or in the
     aggregate, prohibit or materially delay consummation of the Merger or
     otherwise prevent Parent or Purchaser from performing their obligations
     under this Agreement; (ii) the representation and warranty contained in
     Section 5.05 of this Agreement shall be true and correct as of the
     Effective Time; (iii) the covenants and agreements contained in this
     Agreement to be complied with by Parent and Purchaser on or before the
     Effective Time shall have been complied with in all material respects; and
     (iv) the Company shall have

                                       40


     received a certificate from a duly authorized officer of Parent and
     Purchaser to the foregoing effect.

          SECTION 8.03 Conditions to the Obligations of Parent and Purchaser.
The obligations of Parent and Purchaser to effect the Merger shall be subject to
the satisfaction or waiver, at or prior to the Effective Time, of the following
conditions:

          (a) Representations and Warranties. (i) (x) Each of the
     representations and warranties of the Company contained in this Agreement
     that is qualified by reference to "materiality" or Material Adverse Effect
     shall be true and correct as of the date of this Agreement and as of the
     Effective Time, except to the extent such representations and warranties
     are made as of another date, in which case such representations and
     warranties shall be so true and correct as of such other date; and (y) each
     of the representations and warranties of the Company that is not qualified
     by reference to "materiality" or Material Adverse Effect shall be true and
     correct in all material respects as of the date of this Agreement and as of
     the Effective Time, except, to the extent such representations and
     warranties are made as of another date, in which case such representations
     and warranties shall be so true and correct as of such other date, except
     in the case of either (x) or (y) where any failure of such representations
     and warranties to be true and correct either individually or in the
     aggregate would not have a Material Adverse Effect; (ii) the covenants and
     agreements contained in this Agreement to be complied with by the Company
     on or before the Effective Time shall have been complied with in all
     material respects; and (iii) Parent shall have received a certificate from
     a duly authorized officer of the Company to the foregoing effect.

          (b) Dissent Shares. A demand for fair value of the Shares under
     Section 351.455 of the MGBCL shall not have been perfected, asserted or
     demanded with respect to more than 10% of the aggregate number of Shares.

                                   ARTICLE IX
                        TERMINATION, AMENDMENT AND WAIVER

          SECTION 9.01 Termination. This Agreement may be terminated and the
Merger may be abandoned at any time prior to the Effective Time:

          (a) By mutual written consent of each of Parent and the Company;

          (b) By either Parent or the Company if the Effective Time shall not
     have occurred on or before April 7, 2006 (the "Outside Date"); provided
     that such date may be extended until August 8, 2006 by either Parent or the
     Company if all of the conditions to Closing set forth in Article VIII
     (other than conditions with respect to actions the respective parties will
     take at the Closing itself) have been satisfied as of the Outside Date,
     except that (1) all applicable waiting periods under the HSR Act have not
     expired or been terminated or (2) an Order (whether preliminary or
     permanent) has been entered by a Governmental Authority which had the
     effect of enjoining the consummation of the Merger (other than a final and
     nonappealable Order); provided that the right to extend the Outside Date or
     terminate this Agreement under this Section 9.01(b) shall not be

                                       41


     available to (A) Parent if its failure to fulfill any obligation under this
     Agreement has been the cause of, or resulted in, the failure of the
     Effective Time to occur on or before such date or (B) the Company if the
     failure of the Company to fulfill any obligation under this Agreement has
     been the cause of, or resulted in, the failure of the Effective Time to
     occur on or before such date;

          (c) By either Parent or the Company if any Governmental Authority
     shall have enacted, issued, promulgated, enforced or entered any Law or
     Order prohibiting consummation of the Merger, and such Order shall have
     become final and nonappealable;

          (d) By Parent, in the event of a breach by the Company of any
     representation, warranty or covenant that would cause any condition
     contained in Section 8.03(a) not to be satisfied, which breach, if capable
     of cure, shall not have been cured within ten business days of receipt by
     the Company of written notice from Parent specifying such breach;

          (e) By the Company, in the event of a breach by Parent or Purchaser of
     any representation, warranty or covenant that would cause any condition
     contained in Section 8.02 not to be satisfied, which breach, if capable of
     cure, shall not have been cured within ten business days of receipt by
     Parent or Purchaser, as applicable, of written notice from the Company
     specifying such breach;

          (f) Subject to clause (y) of the last sentence of Section 7.04(a) of
     this Agreement, by Parent if, at any time prior to the date of the Company
     Shareholders Meeting, the Company Board shall have (i) effected a Change in
     the Company Recommendation or (ii) approved or recommended, or proposed to
     approve or recommend, any Competing Transaction;

          (g) By the Company or Parent if, upon a vote taken thereon at the
     Company Shareholders Meeting or any postponement or adjournment thereof,
     the Requisite Shareholder Approval is not obtained; or

          (h) By the Company, at any time prior to obtaining the Requisite
     Shareholder Approval of this Agreement, in accordance with Section 7.04(c)
     in order to enter into a definitive agreement with respect to a Superior
     Proposal.

          SECTION 9.02 Effect of Termination. In the event of the termination of
this Agreement by either Parent or the Company pursuant to Section 9.01, this
Agreement shall forthwith become void, and there shall be no liability on the
part of any party hereto or their respective officers, directors, employees,
agents, advisors or other representatives, except that (a) Section 7.03(b), this
Section 9.02, Section 9.03 and Article X shall survive termination and (b)
nothing herein shall relieve any party from liability or damages arising out of
any intentional or willful breach of any covenant in this Agreement prior to
such termination.

          SECTION 9.03 Fees and Expenses. (a) In the event that:

          (i) this Agreement shall be terminated by Parent pursuant to clause
     (i) of Section 9.01(f), or any person (including, without limitation, the
     Company or any affiliate

                                       42


     thereof) pursuant to Section 9.01(g), and (A) in the case of termination
     pursuant to Section 9.01(g), prior to the vote by the Company's
     shareholders on this Agreement, a Competing Transaction shall have been
     publicly announced and not withdrawn, or has otherwise become publicly
     known after the date of this Agreement, and (B) in the case of termination
     pursuant to either clause (i) of Section 9.01(f) or Section 9.01(g), the
     Company enters into a definitive agreement, within 12 months after such
     termination, relating to a Competing Transaction and such transaction is
     thereafter consummated, the Company shall pay the Fee to Parent on the date
     of completion of such transaction less any Expenses paid to Parent pursuant
     to Section 9.03(b);

          (ii) this Agreement is terminated pursuant to Section 9.01(h), the
     Company shall pay the Fee to Parent on the date of such termination; or

          (iii) this Agreement is terminated by Parent pursuant to clause (ii)
     of Section 9.01(f), the Company shall pay the Fee to Parent within five
     business days of the date of such termination.

          (b) If this Agreement is terminated by Parent pursuant to Section
9.01(d) or 9.01(f)(i) of this Agreement, then the Company shall pay to Parent,
within five business days after receipt by the Company of reasonable
documentation with respect to such expenses, Expenses incurred by Parent through
the date of termination of this Agreement up to a maximum of $3,500,000.

          (c) Except as set forth in this Section 9.03, all costs and expenses
incurred in connection with this Agreement and the transactions contemplated by
this Agreement shall be paid by the party incurring such costs and expenses,
whether or not the Merger is consummated.

          (d) All amounts payable under this Section 9.03 shall be paid in
immediately available funds to an account specified by Parent.

          (e) The Company acknowledges that the agreements contained in this
Section 9.03 are an integral part of the transactions contemplated by this
Agreement and that without these agreements Parent would not enter in this
Agreement. In the event that the Company shall fail to pay the Fee or Expenses,
such Fee or Expenses shall be deemed to include the costs and expenses actually
incurred or accrued by Parent or Purchaser (including, without limitation, fees
and expenses of counsel) in connection with the collection under and enforcement
of this Section 9.03, together with interest on such unpaid Fee or Expenses,
commencing on the date that such Fee or Expenses became due, at a rate equal to
the rate of interest publicly announced by Citibank, N.A. from time to time, in
the City of New York, as such bank's base rate. Payment of the fees and expenses
described in this Section 9.03 shall not be in lieu of any damages incurred in
the event of a willful breach or intentional breach of any covenant in this
Agreement prior to such termination.

          SECTION 9.04 Amendment and Waiver. Except as may otherwise be provided
herein, any provision of this Agreement may be amended, modified or waived by
the parties hereto, by action taken by or authorized by their respective Board
of Directors, prior to the Effective Time if, and only if, such amendment or
waiver is in writing and signed, in the case of

                                       43


an amendment, by the Company and Parent or, in the case of a waiver, by the
party against whom the waiver is to be effective; provided that after the
approval of this Agreement by the shareholders of the Company, no such amendment
shall be made except as allowed under applicable Law. Any waiver of any term
shall not be construed as a waiver of any subsequent breach or a subsequent
waiver of the same term or condition, or a waiver of any other term or condition
of this Agreement.

                                    ARTICLE X
                               GENERAL PROVISIONS

          SECTION 10.01 Non-Survival of Representations and Warranties. The
representations, warranties, covenants and agreements contained in this
Agreement and in any certificate or instrument delivered pursuant hereto shall
terminate at the Effective Time or upon the termination of this Agreement,
except for Section 7.06 and those other covenants or obligations that by their
terms apply or are to be performed in whole or in part after the Effective Time.

          SECTION 10.02 Notices. All notices, requests, claims, demands and
other communications hereunder shall be in writing and shall be given (and shall
be deemed to have been duly given upon receipt) by delivery in person, by
overnight courier, by facsimile or by registered or certified mail (postage
prepaid, return receipt requested) to the respective parties at the following
addresses (or at such other address for a party as shall be specified in a
notice given in accordance with this Section 10.02):

            if to Parent or Purchaser:

                  Quest Diagnostics, Inc.
                  1290 Wall Street West
                  Lyndhurst, New Jersey 07071
                  Facsimile No:  (201) 559-2255
                  Attention:  General Counsel

            with a copy to:

                  Shearman & Sterling LLP
                  599 Lexington Avenue
                  New York, New York 10022
                  Facsimile No:  (212) 848-7179
                  Attention:  Clare O'Brien, Esq.
                               Stephen Besen, Esq.

            if to the Company:

                  LabOne, Inc.
                  10101 Renner Boulevard
                  Lenexa, Kansas 66219
                  Facsimile No:  913 859-6832
                  Attn:  General Counsel

                                       44


            with a copy to:

                  Stinson Morrison Hecker LLP
                  1201 Walnut, Suite 2800
                  Kansas City, Missouri 64106
                  Facsimile No:  (816) 691-3495
                  Attn:  John A. Granda, Esq.

            with an additional copy to:

                  Fried, Frank, Harris, Shriver & Jacobson
                  LLP
                  One New York Plaza
                  New York, New York 10004
                  Facsimile No:  (212) 859-4000
                  Attn:  Jeffrey Bagner, Esq.

          SECTION 10.03 Severability. If any term or other provision of this
Agreement is invalid, illegal or incapable of being enforced by any rule of Law,
or public policy, all other conditions and provisions of this Agreement shall
nevertheless remain in full force and effect so long as the economic or legal
substance of the Merger is not affected in any manner materially adverse to any
party. Upon such determination that any term or other provision is invalid,
illegal or incapable of being enforced, the parties hereto shall negotiate in
good faith to modify this Agreement so as to effect the original intent of the
parties as closely as possible in a mutually acceptable manner in order that the
Merger be consummated as originally contemplated to the fullest extent possible.

          SECTION 10.04 Entire Agreement; Assignment. This Agreement and the
Confidentiality Agreement constitute the entire agreement among the parties with
respect to the subject matter hereof and supersede all prior agreements and
undertakings, both written and oral, among the parties, or any of them, with
respect to the subject matter hereof. This Agreement shall not be assigned by
any party hereto, except that Parent and Purchaser may assign all or any of
their rights and obligations hereunder to any affiliate of Parent (who in the
case of Purchaser is a corporation incorporated under Chapter 351 of the MGBCL),
provided that no such assignment shall relieve the assigning party of its
obligations hereunder if such assignee does not perform such obligations.

          SECTION 10.05 Parties in Interest. This Agreement shall be binding
upon and inure solely to the benefit of each party hereto, and nothing in this
Agreement, expressed or implied, is intended to or shall confer upon any other
person any right, benefit or remedy of any nature whatsoever under or by reason
of this Agreement, other than Section 7.06 (which is intended to be for the
benefit of the persons covered thereby and may be enforced by such persons).

          SECTION 10.06 Specific Performance. The parties hereto agree that
irreparable damage would occur in the event any provision of this Agreement were
not performed in accordance with the terms hereof and that the parties shall be
entitled to seek specific performance of the terms hereof, in addition to any
other remedy at Law or equity.

                                       45


          SECTION 10.07 Governing Law; Jurisdiction. This Agreement shall be
governed by, and construed in accordance with, the Laws of the State of New York
applicable to contracts executed in and to be performed in that State (other
than those provisions set forth herein that are required to be governed by the
MGBCL). All actions and proceedings arising out of or relating to this Agreement
shall be heard and determined exclusively in a federal court sitting in the
State of Delaware. The parties hereto hereby (a) submit to the exclusive
jurisdiction of any federal court sitting in the State of Delaware for the
purpose of any Action arising out of or relating to this Agreement brought by
any party hereto, and (b) irrevocably waive, and agree not to assert by way of
motion, defense, or otherwise, in any such Action, any claim that it is not
subject personally to the jurisdiction of the above-named courts, that its
property is exempt or immune from attachment or execution, that the Action is
brought in an inconvenient forum, that the venue of the Action is improper, or
that this Agreement or the Merger may not be enforced in or by any of the
above-named courts.

          SECTION 10.08 Waiver of Jury Trial. Each of the parties hereto hereby
waives to the fullest extent permitted by applicable Law any right it may have
to a trial by jury with respect to any litigation directly or indirectly arising
out of, under or in connection with this Agreement or the Merger. Each of the
parties hereto (a) certifies that no representative, agent or attorney of any
other party has represented, expressly or otherwise, that such other party would
not, in the event of litigation, seek to enforce that foregoing waiver and (b)
acknowledges that it and the other hereto have been induced to enter into this
Agreement and the Merger, as applicable, by, among other things, the mutual
waivers and certifications in this Section 10.08.

          SECTION 10.09 Headings. The descriptive headings contained in this
Agreement are included for convenience of reference only and shall not affect in
any way the meaning or interpretation of this Agreement.

          SECTION 10.10 Counterparts. This Agreement may be executed and
delivered (including by facsimile transmission) in one or more counterparts, and
by the different parties hereto in separate counterparts, each of which when
executed shall be deemed to be an original but all of which taken together shall
constitute one and the same agreement.

                                       46



          IN WITNESS WHEREOF, Parent, Purchaser and the Company have caused this
Agreement to be executed as of the date first written above.

                                    QUEST DIAGNOSTICS INCORPORATED


                                    By /s/ Surya N. Mohaparta, Ph. D.
                                       ------------------------------
                                       Name: Surya N. Mohapatra, Ph. D.
                                       Title:  Chairman, President and
                                               Chief Executive Officer


                                    FOUNTAIN, INC.


                                    By /s/ Surya N. Mohaparta, Ph. D.
                                       ------------------------------
                                       Name: Surya N. Mohapatra, Ph. D.
                                       Title:  President


                                    LABONE, INC.


                                    By /s/ W. Thomas Grant, II
                                        ----------------------
                                       Name: W. Thomas Grant, II
                                       Title:  Chairman and Chief Executive
                                               Officer







                                                                      Appendix B
                              [JPMorgan letterhead]


August 06, 2005


The Board of Directors
LabOne, Inc.
10101 Renner Boulevard
Lenexa, Kansas 66219

Members of the Board of Directors:

You have  requested  our opinion as to the fairness,  from a financial  point of
view,  to the holders of common  stock,  par value $0.01 per share (the "Company
Common  Stock"),  of LabOne,  Inc. (the  "Company") of the  consideration  to be
received by such  holders in the proposed  merger (the  "Merger") of the Company
with a wholly-owned  subsidiary of Quest  Diagnostics  Incorporated (the "Merger
Partner").  Pursuant to the Agreement and Plan of Merger (the "Agreement") among
the Company,  the Merger Partner and Fountain,  Inc. ("Merger Sub"), the Company
will  become  a  wholly-owned   subsidiary  of  the  Merger  Partner,  and  each
outstanding  share of Company Common Stock,  other than shares of Company Common
Stock held in  treasury  or owned by any  subsidiaries  of the Company or by the
Merger Partner or Merger Sub, will be converted into the right to receive $43.90
per share in cash.

In arriving at our opinion, we have (i) reviewed a draft dated August 5, 2005 of
the Agreement;  (ii) reviewed certain publicly  available business and financial
information  concerning  the Company and the  industries  in which it  operates;
(iii)  compared  the  proposed  financial  terms of the Merger with the publicly
available financial terms of certain transactions  involving companies we deemed
relevant and the  consideration  received for such companies;  (iv) compared the
financial  and  operating  performance  of the Company with  publicly  available
information  concerning  certain other companies we deemed relevant and reviewed
the current and historical market prices of the Company Common Stock and certain
publicly  traded  securities  of such  other  companies;  (v)  reviewed  certain
internal  financial  analyses and  forecasts  prepared by the  management of the
Company  relating  to its  business;  and (vi)  performed  such other  financial
studies  and  analyses  and  considered  such  other  information  as we  deemed
appropriate for the purposes of this opinion.

In addition, we have held discussions with certain members of the management of
the Company with respect to certain aspects of the Merger, and the past and
current business operations of the Company, the financial condition and future
prospects and operations of the Company, and certain other matters we believed
necessary or appropriate to our inquiry.

In giving  our  opinion,  we have  relied  upon and  assumed,  without  assuming
responsibility  or  liability  for  independent  verification,  the accuracy and
completeness of all information that was publicly  available or was furnished to
or discussed with us by the Company or otherwise  reviewed by or for us. We have
not  conducted or been provided with any valuation or appraisal of any assets or
liabilities,  nor have we  evaluated  the  solvency of the Company or the




Merger  Partner  under  any  state  or  federal  laws  relating  to  bankruptcy,
insolvency or similar  matters.  In relying on financial  analyses and forecasts
provided to us, we have assumed that they have been reasonably prepared based on
assumptions  reflecting the best currently  available estimates and judgments by
management  as to the  expected  future  results  of  operations  and  financial
condition of the Company to which such analyses or forecasts  relate. We express
no view as to such analyses or forecasts or the  assumptions  on which they were
based.  We  have  also  assumed  that  the  Merger  and the  other  transactions
contemplated by the Agreement will be consummated as described in the Agreement,
and that the definitive  Agreement will not differ in any material respects from
the  draft  thereof  furnished  to us. We have  relied  as to all legal  matters
relevant to rendering  our opinion  upon the advice of counsel.  We have further
assumed  that  all  material  governmental,  regulatory  or other  consents  and
approvals  necessary for the consummation of the Merger will be obtained without
any adverse effect on the Company.

Our opinion is necessarily based on economic,  market and other conditions as in
effect on, and the information  made available to us as of, the date hereof.  It
should be understood  that subsequent  developments  may affect this opinion and
that we do not have any obligation to update,  revise, or reaffirm this opinion.
Our opinion is limited to the fairness,  from a financial  point of view, of the
consideration  to be received by the holders of the Company  Common Stock in the
proposed  Merger and we express no opinion as to the  fairness of the Merger to,
or any consideration of, the holders of any other class of securities, creditors
or other  constituencies of the Company or as to the underlying  decision by the
Company to engage in the Merger.

We note that we were not  authorized to and did not solicit any  expressions  of
interest  from any other  parties with respect to the sale of all or any part of
the Company or any other alternative transaction.  Consequently, we have assumed
that such terms are the most  beneficial  terms from the  Company's  perspective
that could  under the  circumstances  be  negotiated  among the  parties to such
transactions,  and no opinion is expressed  whether any alternative  transaction
might  produce  consideration  for the  Company's  shareholders  in an amount in
excess of that contemplated in the Merger.

We have acted as  financial  advisor to the Company with respect to the proposed
Merger and will  receive a fee from the Company for our  services.  We will also
receive an additional fee if the proposed  Merger is  consummated.  In addition,
the Company has agreed to  indemnify us for certain  liabilities  arising out of
our engagement. We and our affiliates have from time to time provided investment
banking and  commercial  banking  services to the Company,  including  acting as
bookrunning lead managing  underwriter in connection with the Company's offering
of its convertible debt securities in 2004. Our affiliate,  JPMorgan Chase Bank,
National Association, acts as administrative agent with respect to the Company's
revolving credit facility and is a lender to the Merger Partner. In the ordinary
course of our businesses,  we and our affiliates may actively trade the debt and
equity  securities  of the Company or the Merger  Partner for our own account or
for the accounts of customers and, accordingly,  we may at any time hold long or
short positions in such securities.

On the basis of and subject to the  foregoing,  it is our opinion as of the date
hereof  that the  consideration  to be  received  by the  holders of the Company
Common Stock in the proposed  Merger is fair, from a financial point of view, to
such holders.




This letter is provided to the Board of Directors  of the Company in  connection
with and for the purposes of its evaluation of the Merger. This opinion does not
constitute a  recommendation  to any  shareholder  of the Company as to how such
shareholder  should vote with  respect to the Merger or any other  matter.  This
opinion may not be disclosed, referred to, or communicated (in whole or in part)
to any third party for any  purpose  whatsoever  except  with our prior  written
approval.  This opinion may be  reproduced  in full in any proxy or  information
statement  mailed  to  shareholders  of the  Company  but may not  otherwise  be
disclosed publicly in any manner without our prior written approval.

Very truly yours,



/s/ J.P. MORGAN SECURITIES INC.





                                                                      Appendix C

                 Missouri Statute 351.455. - Dissenters' Rights.

Shareholder who objects to merger may demand value of shares, when

1.  If  a  shareholder  of a  corporation  which  is a  party  to  a  merger  or
consolidation  and, in the case of a  shareholder  owning voting stock as of the
record  date,  at the  meeting  of  shareholders  at which the plan of merger or
consolidation is submitted to a vote shall file with such  corporation  prior to
or at such meeting a written  objection to such plan of merger or consolidation,
and shall not vote in favor thereof,  and such  shareholder,  within twenty days
after the merger or consolidation is effected,  shall make written demand on the
surviving or new  corporation for payment of the fair value of his or her shares
as of the day prior to the date on which the vote was taken approving the merger
or   consolidation,   the  surviving  or  new  corporation  shall  pay  to  such
shareholder,   upon  surrender  of  his  or  her   certificate  or  certificates
representing  said shares,  the fair value thereof.  Such demand shall state the
number  and  class of the  shares  owned  by such  dissenting  shareholder.  Any
shareholder  failing  to make  demand  within  the  twenty-day  period  shall be
conclusively presumed to have consented to the merger or consolidation and shall
be bound by the terms thereof.

2. If within  thirty days after the date on which such  merger or  consolidation
was  effected  the value of such  shares is agreed upon  between the  dissenting
shareholder and the surviving or new corporation, payment therefor shall be made
within  ninety  days after the date on which such  merger or  consolidation  was
effected,  upon  the  surrender  of  his  or  her  certificate  or  certificates
representing  said  shares.  Upon  payment  of the agreed  value the  dissenting
shareholder  shall  cease  to  have  any  interest  in  such  shares  or in  the
corporation.

3. If within such period of thirty days the shareholder and the surviving or new
corporation do not so agree,  then the dissenting  shareholder may, within sixty
days after the expiration of the thirty-day period, file a petition in any court
of competent  jurisdiction  within the county in which the registered  office of
the  surviving  or  new  corporation  is  situated,  asking  for a  finding  and
determination  of the fair  value of such  shares,  and  shall  be  entitled  to
judgment  against the surviving or new  corporation  for the amount of such fair
value as of the day prior to the date on which  such  vote was  taken  approving
such merger or consolidation, together with interest thereon to the date of such
judgment.  The judgment shall be payable only upon and  simultaneously  with the
surrender to the surviving or new corporation of the certificate or certificates
representing  said  shares.  Upon the payment of the  judgment,  the  dissenting
shareholder shall cease to have any interest in such shares, or in the surviving
or new corporation.  Such shares may be held and disposed of by the surviving or
new corporation as it may see fit. Unless the dissenting  shareholder shall file
such petition within the time herein limited,  such  shareholder and all persons
claiming under such shareholder shall be conclusively  presumed to have approved
and  ratified  the  merger  or  consolidation,  and  shall be bound by the terms
thereof.

4.  The  right of a  dissenting  shareholder  to be paid the fair  value of such
shareholder's  shares as herein provided shall cease if and when the corporation
shall abandon the merger or consolidation.

5. When the remedy  provided for in this section is available  with respect to a
transaction,  such remedy shall be the exclusive remedy of the shareholder as to
that  transaction,  except in the case of fraud or lack of authorization for the
transaction.




                            PRELIMINARY FORM OF PROXY

                                  LABONE, INC.

                         SPECIAL MEETING OF SHAREHOLDERS

                               _____________, 2005

           THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

     The  undersigned  hereby appoints W. Thomas Grant, II and Joseph C. Benage,
and any one or more of them  with  full  power  of  substitution,  as a Proxy or
Proxies to vote, as  designated  on the reverse  side,  all the shares of Common
Stock of LabOne the  undersigned  is entitled to vote at the special  meeting of
shareholders  of LabOne to be held on __________,  2005, or any  adjournments or
postponements  thereof.  This  proxy  revokes  all  prior  proxies  given by the
undersigned.

     If no  instructions  are specified,  this proxy,  if signed,  will be voted
"FOR" on  Proposals  1 and 2 on the  reverse  side.  If any  other  business  is
properly presented at the special meeting, this proxy will be voted by the above
named proxies in their  discretion.  At the present time, the board of directors
knows of no other business to be presented at the special meeting.

        PLEASE MARK, SIGN, DATE AND RETURN THIS PROXY CARD PROMPTLY USING
                         THE ENCLOSED PREPAID ENVELOPE.

                (Continued and to be signed on the reverse side)






                       SPECIAL MEETING OF SHAREHOLDERS OF

                                  LABONE, INC.

                           _____________________, 2005





                                                     
BY MAIL:                      BY TELEPHONE                 THROUGH THE INTERNET
Mark, sign and date your      (Available until ____,       (Available until ____,
proxy card                    Central                      Central
and return it in the          Time, on _______, 2005)      Time, on _______, 2005)
enclosed envelope             Call toll-free               Access website at
to:                           ________________ on          https://www._________________`
D. F. King & Co., Inc.        any touch-tone telephone to  to authorize the voting of
48 Wall Street                authorize the voting of      your
New York, New York  10005     your shares.                 shares. You may access the
(212) 269-5550 - Banks and    You may call 24 hours a      site 24
Brokers                       day, 7 days                  hours a day, 7 days a week.
     (collect calls)          a week. You will be          You will
(888) 567-1626 - All others   prompted to                  be prompted to follow simple
     (toll-free)              follow simple instructions.  instructions.





                    V Please detach and mail in the envelope provided.



THE BOARD OF DIRECTORS  RECOMMENDS A VOTE  "FOR"   PROPOSALS  1 and 2.  PLEASE SIGN,  DATE  AND  RETURN PROMPTLY IN THE ENCLOSED
ENVELOPE. PLEASE MARK YOUR VOTE IN BLUE OR BLACK INK AS SHOWN HERE

                                                                                                  
                  1. Approval of the Agreement and Plan of Merger, dated as of           For      Against     Abstain
                  August 8, 2005, by and among LabOne, Inc., Quest Diagnostics           [  ]       [  ]        [  ]
                  Incorporated and Fountain, Inc.

                  2. Approval of the grant to the proxyholders of the authority          For      Against     Abstain
                  to vote in their discretion to adjourn the special meeting to          [  ]       [  ]        [  ]
                  a later date to solicit additional proxies.
-----------------
                  Should the undersigned be present and elect to vote at the Special Meeting or any postponement or adjournment
                  thereof and after notification to the Secretary of the Company at the Special  Meeting  of the  Shareholder's
                  decision to terminate this proxy, then the power of such proxies shall be deemed terminated and of no further
                  force and effect. This proxy may also be revoked by sending written notice to the Secretary of the Company at
                  the address set forth on the Notice of Special Meeting of Shareholders,  by  filing of a later-dated proxy to
                  vote on the  proposals  at the Special Meeting, or by logging onto the Internet website specified above or by
                  calling the telephone number specified above.

                  Please complete, date and sign this proxy and return it promptly in the enclosed postage paid envelope.

[  ]    Please mark this box if you plan to attend the Special Meeting.



Signature of Shareholder _____________________   Date___________  Signature of Shareholder _____________________   Date___________

Note: Please  sign  exactly  as your name or names  appear on this  Proxy.  When shares are held jointly, each holder should sign.
      When signing as executor, administrator,  attorney,  trustee or  guardian,  please give full title as such. If the signer is
      a  corporation,  please sign full  corporate name by duly  authorized  officer,  giving  full  title as  such.  If signer is
      a partnership, please sign in partnership name by authorized person.