EXHIBIT 10.5

                             EMPLOYMENT AGREEMENT



      THIS IS AN EMPLOYMENT AGREEMENT  ("Agreement") made and entered into as of
the 1st day of May,  1999,  by and  between  DIANON  Systems,  Inc.,  a Delaware
corporation ("DIANON"), and Beth Phillips ("Phillips").

                                  RECITALS:

      WHEREAS,  DIANON has acquired substantially all of the assets and business
of Kyto  Meridien  Diagnostics,  L.L.C.,  a New York limited  liability  company
("Kyto Meridien"), pursuant to the terms of an Asset Purchase Agreement dated as
of April 7, 1999, by and among DIANON,  Kyto Meridien,  Kyto Diagnostics,  L.P.,
Meridien  Diagnostics  Labs,  Inc., A. Bruce Shapiro and Ralph M. Richart,  M.D.
(the "Asset Purchase Agreement"); and

      WHEREAS,  DIANON desires to employ Phillips for a period  commencing as of
the Closing Date ("Closing Date") of the Asset Purchase Agreement and ending two
years from that date and Phillips  desires to work for DIANON for such period on
the terms and conditions hereinafter provided; and

      WHEREAS,  Phillips's  position  with Kyto Meridien has given her access to
and familiarity with the confidential  information and business of Kyto Meridien
acquired  by DIANON and her  employment  with DIANON will give her access to and
familiarity with the confidential information and business of DIANON; and

      WHEREAS,  DIANON would be irreparably  harmed if Phillips  should disclose
any of the confidential information which Phillips has acquired and will acquire
or by entering into any activity  competing  with DIANON or the business of Kyto
Meridien acquired by DIANON.

      NOW,  THEREFORE,  in  consideration  of the  mutual  covenants,  terms and
conditions of this Agreement, Phillips and DIANON agree as follows:

      1.    EMPLOYMENT.  DIANON hereby employs  Phillips on a full-time basis to
serve as  Operations  Manager of the New City  facility to perform such services
and such  tasks  and  assignments  that are  reasonably  assigned  to her by the
general  manager  of  the  business  acquired  by  DIANON  consistent  with  her
knowledge,  experience  and position,  which  services  shall  include,  but not
necessarily be limited to, initially aiding in the conversion and implementation
of the Kyto Meridien  business to the  administrative,  financial and laboratory
systems  and  operations  of DIANON  and,  over  time,  assuming  duties for the
management and coordination of non-technical areas of laboratory  operations and
client service.

      During her  employment,  Phillips  shall at all times conduct  herself and
perform her services in a proficient and professional manner, in accordance with
the  applicable  standards  of  care  and  the  highest  standards  of  business
ethics.

      2.    COMPENSATION.  As full  consideration  for the services  rendered by
Phillips  pursuant to this  Agreement,  together  with  Phillips's  undertakings
pertaining to the  




preservation of confidential information and the restrictive covenant set forth,
respectively,  in Sections 4 and 5 below,  DIANON shall, during the term of this
Agreement, compensate Phillips as follows:

            (a)   DIANON shall pay Phillips an annualized salary of ninety-three
thousand seven hundred ($93,700)  dollars,  payable in twenty-six equal biweekly
(once every two weeks)  increments  of three  thousand six hundred three dollars
and eighty-five cents ($3,603.85);

            (b)   DIANON  shall  reimburse the reasonable  business  expenses of
Phillips in performing  her duties  hereunder in  accordance  with such policies
regarding  employee  expenses  as DIANON  may have in  effect  from time to time
during the term;

            (c)   Phillips shall be eligible for such other employee benefits as
are  generally  provided  by DIANON to its  employees,  subject to the terms and
conditions, including eligibility conditions, of any applicable employee benefit
plan or program;

            (d)   Upon termination of employment,  Phillips may, at her own cost
and in accordance with the requirements of COBRA,  extend her employee insurance
benefits.

      3.    TERM.   Unless sooner terminated in accordance with Section 9 below,
the term of this  Agreement  and  Phillips's  employment  shall  commence on the
Closing Date of the Asset Purchase  Agreement and end on the second  anniversary
thereof.

      4.    CONFIDENTIAL  INFORMATION.  From and after the date hereof, Phillips
will not,  directly  or  indirectly,  use for her own  benefit or  purposes,  or
disclose  to, or use for the  benefit or  purpose of any person or entity  other
than DIANON,  any  confidential  information,  knowledge or data relating to the
business or operations of DIANON or those acquired by DIANON from Kyto Meridien.
Such information,  knowledge or data includes,  but is not limited to, secret or
confidential  matters not published or generally known in the industry,  such as
information regarding pricing, costs, purchasing,  profits, financing,  markets,
sales  or  customer  lists,   future   developments,   audits,   investigations,
enforcement actions, regulatory compliance,  laboratory procedures and marketing
and expansion  plans.  Any and all materials which may be produced or created by
Phillips or others,  or which may come into her  possession in the course of her
employment,  or which  relate  in any  manner  to the  business  or  prospective
business  of  DIANON  are and shall be the  exclusive  property  of  DIANON  and
Phillips shall not have any right, title or interest in any such materials. Upon
termination of her  employment,  Phillips shall not have the right to remove any
such materials  from the offices of DIANON and shall  promptly  return to DIANON
all things of whatever nature that belong to DIANON, including all materials and
records in any form,  format or medium containing or related to the confidential
information  of DIANON,  and she shall  neither make nor retain any part or copy
thereof for her personal use or the use of third parties.

            Notwithstanding  the foregoing,  confidential  information shall not
include any information  that is: (i)  demonstrably  developed  independently by
Phillips;  (ii)  publicly  disclosed by DIANON or otherwise in the public domain
without violation of this Agreement by Phillips; or (iii) rightfully received by
Phillips from a third party,  which, by disclosing to Phillips,  does not breach
any obligation or duty to DIANON.  Notwithstanding  this Section 4, Phillips may
make such disclosures of confidential information as are duly compelled by court
order or as required by law.


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      5.    RESTRICTIVE  COVENANT.  In  consideration  of this Agreement,  for a
period of two years from and after the Closing  Date and for any renewal  period
or extension of the term hereof, and  notwithstanding any earlier termination of
this Agreement, except upon the express written consent of DIANON (which consent
may be  unreasonably  withheld),  Phillips  shall not, for her own  account,  on
behalf of, or jointly  with,  any other  person,  directly or  indirectly,  own,
manage, operate, join, control, finance, invest in, perform services for, advise
(or advise others with respect to), or otherwise participate in, or be connected
with,  or  become  or act as a  partner,  manager,  member,  director,  officer,
employee,  consultant,  representative  or agent  of any  business  (other  than
DIANON), individual,  partnership, firm, proprietorship,  professional practice,
corporation,  limited  liability  company or other entity that provides clinical
laboratory or anatomic or surgical  pathology  services within a one hundred and
fifty mile radius of New York City; provided however, that Phillips may purchase
or own,  solely as an inactive  investor,  the securities of any entity that are
publicly traded on a national  securities  exchange where  Phillips's  aggregate
holdings of such  securities do not exceed two percent of the voting power or of
any class of stock of such entity.

            In  addition to the foregoing,  during the same two-year  period and
for any renewal  period or extension of the term hereof,  Phillips shall not, on
her own  behalf,  or on behalf of any other  person or entity:  (i)  solicit the
customers,  suppliers  or  employees of DIANON or any  affiliated  entity;  (ii)
solicit or seek to hire any  employee  of DIANON or any  affiliated  entity;  or
(iii) attempt in any manner,  directly or  indirectly,  to influence,  induce or
encourage any such employee to leave the  employment of DIANON or any affiliated
entity.  Phillips shall not take any action intended, or which may reasonably be
expected,  directly or  indirectly,  to impair the goodwill,  reputation or good
name of DIANON or Kyto Meridien, or otherwise to be detrimental to the interests
of DIANON,  including any action intended,  or which may reasonably be expected,
directly or indirectly to benefit a competitor of DIANON.

      6.    SCOPE OF  RESTRICTIONS.  Phillips agrees that the  restrictions  set
forth in Section 5 are  reasonable.  If,  however,  a court  determines that any
provision of Section 5 is unreasonable,  either in geographic  scope,  length of
time or  otherwise,  then  Section 5 shall be  interpreted  and  enforced to the
maximum extent permitted by law and Phillips consents and agrees that such scope
may be judicially modified accordingly in any proceeding brought to enforce such
restriction.

      7.    INJUNCTIVE RELIEF. Phillips acknowledges that irreparable harm would
be suffered by DIANON in the event that any of the provisions of Sections 4 or 5
were not performed fully n accordance with the terms specified  therein and that
monetary  damages are an  inadequate  remedy for breach  thereof  because of the
difficulty of  ascertaining  and  quantifying  the amount of damage that will be
suffered  by DIANON in the event  that such  undertakings  and  provisions  were
breached or violated. Accordingly, Phillips agrees that DIANON shall be entitled
to an  injunction or  injunctions  to restrain,  enjoin and prevent  breaches or
threatened  breaches of the  covenants,  undertakings  and  provisions  of those
sections and to enforce  specifically the provisions therein in any court of the
United  States  or any  state  having  jurisdiction  over the  matter,  it being
understood  that any such remedies  shall be in addition to, and not in lieu of,
any other  rights and  remedies  available  at law or in equity and shall not be
deemed  exclusive of any common law or other rights of DIANON in connection with
the matters covered hereby.


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      8.    INTELLECTUAL  PROPERTY RIGHTS. Phillips agrees to assign, and hereby
does  assign to  DIANON  all of her  right,  title  and  interest  in and to all
inventions, improvements, discoveries and technical developments, whether or not
patentable,  which she solely or jointly with others,  may conceive or reduce to
practice  during the term of her employment,  which are related,  in whole or in
part, directly or indirectly, to the business of, or services or products of the
type, provided by DIANON, or which may reasonably be provided or used by DIANON,
or which are otherwise developed, in whole or in part, at DIANON's expense.

      Phillips shall disclose  promptly to DIANON,  all such ideas,  discoveries
and  improvements  conceived by her alone or in collaboration  with others,  and
shall cooperate fully with DIANON both during and after employment, with respect
to the procurement of patents for the  establishment and maintenance of DIANON's
rights  and  interests  in  said   inventions,   improvements,   discoveries  or
developments,  and shall  sign all  papers  which  DIANON  may  reasonably  deem
necessary or desirable for the purpose of vesting it with such rights.

      9.   TERMINATION.      (a) Phillips's  employment  under this Agreement
shall terminate on the occurrence of any of the following events:

            (i)   Upon the death of Phillips;

            (ii)  Upon  the sending of written notice from DIANON describing the
activities  constituting an act of default falling within any one or more of the
following categories:

                  (A) Phillips's breach of any material promise or agreement set
                  forth  herein or failure to perform  (other  than for  reasons
                  beyond her control) substantially all of the duties reasonably
                  required by Section 1; or

                  (B)  Phillips's  commission  of an act of gross  negligence or
                  willful  misconduct,  or acts showing a pattern of negligence,
                  in the performance of her duties or obligations hereunder;

Provided that no such termination  under this subsection 9(b) shall be effective
unless  Phillips has first been afforded an  opportunity  to correct the alleged
default,  but such default continues,  recurs or can not otherwise be corrected,
in the good faith judgment of DIANON,  within thirty days after delivery of such
written notice of default to Phillips;

            (iii) Upon  the  occurrence of an event or the  commission of an act
under  which  Phillips  is or may become  subject  to  mandatory  or  permissive
exclusion  from  Medicare and State health care  programs,  including  those set
forth  in  sections  1128,  1156  and 1892 of the  Social  security  Act and any
regulations promulgated thereunder; and

            (iv)  Upon  the passage of thirty  (30)days  after written notice of
termination without cause from DIANON to Phillips.

      (b)   In  the  event  of a  termination  of  this  Agreement  pursuant  to
subsection  9(a)(iv)  above,  DIANON  shall  continue  to pay  the  compensation
required by subsection  2(a) above until the second  anniversary  of the Closing
Date of the Asset Purchase Agreement.


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      (c)   Section  4, 5, 6, 7, 11 and 13 of this Agreement  shall survive,  in
accordance  with their terms,  any  termination or expiration of this Agreement,
whether any such termination be with or without cause or expiration  occurs with
the passage of time.  Without  limitation,  no termination or expiration of this
Agreement  shall relieve  Phillips of her  obligations to DIANON with respect to
the  restrictive  covenant  in Section 5 and the  preservation  of  confidential
information  under Section 4. Should Phillips violate any of the requirements of
Sections 4 or 5 of this Agreement, DIANON may, in addition to any other remedies
provided  to DIANON  under  this  Agreement,  at law or in  equity,  immediately
terminate  any further  post-termination  payments to  Phillips  hereunder  that
otherwise may have been required.

      10.   WAIVER.  The  failure  of  either  party  at  any  time  to  require
performance  by the other party of any provision  hereof shall not affect in any
way the full right to require such performance at any time thereafter, nor shall
a waiver by either party of a breach of any provision hereof be taken or held to
be a waiver of the provision itself.

      11.   NOTICES.  All notices,  requests,  demands and other  communications
hereunder  shall be in  writing  and shall be deemed to have been duly  given if
delivered by hand, by  nationally  recognized  overnight  delivery  service,  or
mailed by  certified or  registered  mail,  postage  prepaid,  and  addressed as
follows:

            If to Phillips:   Beth Phillips
                              3 South Grant Ave.
                              Congers, New York 10920

            If to DIANON:     DIANON Systems, Inc.
                              200 Watson Boulevard
                              Stratford, Connecticut  06497
                              Attn: President

      12.   ENTIRE  AGREEMENT.  This Agreement and the Asset Purchase  Agreement
set forth the entire agreement and  understanding of the parties  concerning the
subject  matter  hereof.  This  Agreement  may  be  amended  only  by a  written
instrument signed by both parties, which instrument must make specific reference
to this Agreement and the intention to modify it.

      13.   GOVERNING  LAW. This Agreement shall be governed by and construed in
accordance  with the laws of the  State of New  York  without  reference  to the
conflicts of laws provisions of that state.


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      IN WITNESS WHEREOF, the parties have executed this Agreement as of the day
first above written.



                                          /s/ Beth Phillips
                                          -----------------
                                          Beth Phillips



                                          DIANON SYSTEMS, INC.


                                          /s/ Kevin C. Johnson
                                          --------------------
                                          By:  Kevin C. Johnson
                                          Its:   President & CEO





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