DIANON SYSTEMS INC
10-K, 1998-03-31
MEDICAL LABORATORIES
Previous: RESOURCES ACCRUED MORTGAGE INVESTORS LP SERIES 86, NT 10-K, 1998-03-31
Next: ORGANOGENESIS INC, 10-K, 1998-03-31



                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 10-K
(Mark One)

[X]       ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
          EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 1997

                                       or

[ ]       TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
          EXCHANGE ACT OF 1934 For the transition period from
          __________________________ to ____________________________


Commission file number 000-19392
                       ---------

                              DIANON Systems, Inc.
                              --------------------
             (Exact name of registrant as specified in its charter)


            Delaware                                             06-1128081
            --------                                             ----------
(State or other jurisdiction of                               (I.R.S. Employer
 incorporation or organization                               Identification No.)


200 Watson Boulevard, Stratford, Connecticut                          06497
- --------------------------------------------                          -----
(Address of principal executive offices)                            (Zip Code)


Registrant's telephone number, including area code (203) 381-4000
                                                   --------------

Securities registered pursuant to Section 12(b) of the Act:

Title of each class                    Name of each exchange on which registered
- -------------------                    -----------------------------------------
      None                                                 None


           Securities registered pursuant to section 12(g) of the Act:

                     Common Stock, par value $.01 per share
                     --------------------------------------
                                (Title of class)

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days. [X] Yes [ ] No

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405
of Regulation S-K (ss. 229.405 of this chapter) is not contained herein, and
will not be contained, to the best of registrant's knowledge, in definitive
proxy or information statements incorporated by reference in Part III of this
Form 10-K or any amendment to this Form 10-K. [ ]

As of March 16, 1998, the aggregate market value of the voting Common Stock held
by non-affiliates of the registrant was $65,341,720.

Number of shares of Common Stock outstanding as of March 16, 1998:  6,616,883


                       DOCUMENTS INCORPORATED BY REFERENCE
                                      None

<PAGE>
                                     PART I
ITEM 1.  BUSINESS

         DIANON Systems, Inc. ("DIANON" or the "Company") is a provider of
anatomic pathology and clinical chemistry testing services to physicians,
patients and managed care organizations across the United States.

         The Company has traditionally been a specialized laboratory with a
limited line of clinical chemistry and anatomic pathology testing services based
principally on new technology purchased or licensed from test developers. This
technology has been marketed directly to medical oncologists and urologists as
testing and information services rather than as products or test kits.

         As a result of the Company's success in providing pathology services,
the mission of the Company has been expanded to include a full line of anatomic
pathology services and related information products to physicians, patients and
managed care organizations throughout the United States. The Company's principal
physician audience for these services includes approximately 50,000 clinicians
engaged in the fields of medical oncology, urology, dermatology, gynecology and
gastroenterology. The Company believes it can become one of the leading
specialized providers of anatomic pathology testing services in the United
States.

         While the Company continues in its traditional role of assisting
developers of new technology and physicians evaluating such technology, it is
expected that this activity and the Company's clinical chemistry business will
represent a decreasing proportion of total revenue in future years as anatomic
pathology revenues grow.

         The business of the Company is subject to a number of risks and
uncertainties that could adversely affect the Company's ability to achieve its
objectives. See "Management's Discussion and Analysis of Results of Operations
and Financial Condition - Risk Factors: Forward Looking Statements" for a
description of various factors that could have an adverse effect on the
performance of the Company.

MEDICAL TESTING MARKETS

         Medical laboratories offer a broad range of testing services to the
medical profession. These testing services are used by physicians in the
diagnosis, prognosis, monitoring and general management of diseases and other
clinical conditions. The tests they use generally detect medically-significant
abnormalities and visual patterns in blood, tissue samples and other specimens.

         Management divides the market for medical testing into anatomic
pathology testing and clinical chemistry testing and has set forth in very
general terms some of the major differences between them in the table below:

<TABLE>
<CAPTION>
                              Anatomic Pathology Testing               Clinical Chemistry Testing
                              --------------------------               --------------------------
<S>                          <C>                                      <C>
Type of Specimen              Tissue or cells - usually obtained       Blood or urine - usually collected  
                              by a physician from a biopsy, Pap        by a nurse (blood) or by the patient
                              smear, urine specimen or surgery         (urine)                             
                                                                       

Technology Employed           Physician interpretation of tissue       Highly automated blood chemistries 
                              slides supplemented by special           and  immunoassays
                              antibody stains, DNA probes, genetic     
                              tests

1991 DIANON Net Revenues      $ 9 million                              $18 million

1997 DIANON Net Revenues      $44 million                              $17 million

</TABLE>

                                       2
<PAGE>
         The Company offers a complete line of anatomic pathology testing
services as well as selected clinical chemistry tests for cancer and
gynecological conditions. The Company performed all testing at its main facility
in Stratford, Connecticut until February 1, 1998, at which time it acquired a
second laboratory in Tampa, Florida. It provides most test results to physicians
within forty-eight hours. In 1996, the Company opened a specimen processing
facility at the hub of its airfreight provider in Ohio in order to prepare
certain specimens for more rapid processing when they arrive in Stratford and to
improve overall turnaround time to the physicians. No test accounted for more
than 15% of net revenues in 1997.

INFORMATION SERVICES

         The Company's information services are used principally to assist the
physician in the analysis of test results and to help managed care organizations
better manage patient treatment. These services complement the Company's current
service offerings and are not a separate product category. Patient specific
reports aid the physician in analyzing multiple prognostic tests and/or
correlative trends in a patient's test results, treatment, and clinical
condition. Summary reports on all patients in a physician's practice allow the
physician to compare test results on patients with similar conditions, review
multiple patient histories, and compare his or her experience with that of
physicians across the country. Similar reports help managed care organizations
capture and compare utilization and diagnostic trends within their own
organization, with other managed care organizations and with the Company's
national database. The Company's current information services are an important
part of the Company's marketing program, and they provide important value-added
services which help the Company differentiate itself from competitors.

QUALITY ASSURANCE

         The Company utilizes a unique quality control program for anatomic
pathology which provides a reduced number of equivocal results reported to
clinicians. This program is applied to all anatomic pathology specimens. By
diminishing the number of indeterminate diagnoses and providing the unequivocal
diagnosis as soon as possible, the Company enables clinicians to treat patients
sooner and more effectively while reducing overall health care costs.

         The Company's quality assurance program includes adherence by employees
to the Standard Operating Procedures, continuing education and technical
training of technologists, statistical quality control of all analytical
processes, instrument maintenance, and regular inspection by governmental
agencies and the College of American Pathologists.


EUROPEAN OPERATIONS

         In 1995, the Company provided for a reserve of $279,000 due to
management's decision to discontinue European based operations. Approximately
$20,000 of this reserve remains. The Company is in the final process of
liquidating the European based operations and plans to complete the liquidation
process during 1998.

REIMBURSEMENT

         In 1997, 1996, and 1995, respectively, approximately 37%, 40%, and 41%
of the Company's net revenues were derived from testing performed for
beneficiaries under the Medicare and Medicaid programs, At least 90% of this
total was derived from the Medicare program. Revenues from testing performed for
other patients are derived principally from other third-party payors, including
commercial insurers, Blue Cross Blue Shield plans, health maintenance and
preferred provider organizations, patients, physicians, hospitals, and other
laboratories (who in turn usually bill non-governmental third-party payors or
patients). For many of the tests performed for Medicare or Medicaid
beneficiaries (except clinical diagnostic laboratory tests for those individuals
being treated by a hospital), laboratories are required to bill Medicare or
Medicaid directly for covered services and to accept Medicare or Medicaid
reimbursement as payment in full for such services. Management has elected, to
date, to accept reimbursement rates set by other third-party payors as payment
in full as well (apart from any co-payment which the payor has established).

         Reimbursement rates for some services of the type or similar to the
type performed by the Company have been established by Medicare, Medicaid and
other third-party payors, but have not been established for all services or by
all carriers with respect to any particular service. While most carriers,
including Medicare, do not cover services they determine to be investigational,
or otherwise not reasonable and necessary for diagnosis or treatment, a formal
coverage determination is made with respect to relatively few new procedures.


                                       3
<PAGE>
When such determinations do occur for Medicare purposes, they most commonly are
made by the local Medicare carrier which processes claims for reimbursement
within the carrier's geographic jurisdiction. The Company receives Medicare
reimbursement primarily through a single Medicare carrier. A positive coverage
determination, or reimbursement without such determination, by one or more
third-party payors, or clearance for market by the Food and Drug Administration
("FDA"), does not assure reimbursement by other third-party payors. A few
third-party payors have denied payment for services for which the Company
receives reimbursement from other payors. On occasion, Medicare or other
third-payors have decided to cease payment for one or more of the Company's
services that historically have been reimbursed by them because such services
are performed using test kits or other products which have not received FDA
pre-market clearance or because such services may otherwise be deemed
investigational or for other reasons. Furthermore, Medicare and other
third-party payors have, on occasion, ceased reimbursement when certain tests
are ordered for patients with certain diagnoses while maintaining reimbursement
when tests are ordered for other diagnoses deemed appropriate by the carrier.
This practice recently has become more prevalent with respect to Medicare. The
Balanced Budget Act of 1997 ("BBA") requires the Secretary of the Department of
Health and Human Services ("HHS") to divide the country into no more than five
regions and designate a single Medicare carrier for each region to process
laboratory claims (except those performed by independent physicians' offices) no
later than January 1, 1999, and to adopt uniform coverage, administration, and
payment policies for lab tests using a negotiated rulemaking process by July 1,
1998. Depending on the details of how these requirements are implemented, they
could have an impact on the Company's future revenues. In general, reimbursement
disapprovals by the various carriers, reductions or delays in the establishment
of reimbursement rates, and carrier limitations on the insurance coverage of the
Company's services or the use of the Company as a service provider could have a
material adverse effect on the Company's future revenues.

         Medicare Fee Schedule Payment for Clinical Chemistry Laboratory
Services. Medicare reimbursement for clinical chemistry laboratory services
constituted approximately 25%, 27% and 35% of the Company's clinical chemistry
revenues in 1997, 1996 and 1995, respectively, although this percentage trended
downward to 21% in the fourth quarter of 1997. In 1984, Congress adopted
legislation establishing a locality-specific fee schedule reimbursement
methodology with Consumer Price Index ("CPI")-related updates for clinical
diagnostic laboratory testing for non-hospital patients and hospital
out-patients under Medicare. (Payment for clinical chemistry laboratory services
performed for Medicare in-patients is included within the prospectively
determined Diagnosis Related Group rate paid to the hospital). In addition,
state Medicaid programs are prohibited from paying more than the Medicare fee
schedule amount. Beginning with the Consolidated Omnibus Budget Reconciliation
Act of 1985 ("OBRA `85"), Congress instituted a national cap on Medicare
clinical chemistry laboratory fee schedules. This national cap has been lowered
each year and now is 74% of the national median. In addition, the Omnibus Budget
Reconciliation Act of 1987 ("OBRA `87") eliminated the CPI update for 1988 and,
in succeeding years, Congress has often either limited or eliminated annual
updates of Medicare clinical chemistry laboratory fee schedules. Most recently,
the Omnibus Budget Reconciliation Act of 1993 ("OBRA `93") eliminated the update
for the years 1994 and 1995. After updates of 3.2% in 1996 and approximately
2.7% in 1997, the BBA will freeze fee schedule payments for the 1998 - 2002
period. The update limitations and changes in the national cap made to date have
not had, and are not expected by the Company to have, a material adverse effect
on the Company's results of operations. Any further significant decrease in such
fee schedules, however, could have a material adverse effect on the Company's
future revenues.

         The BBA does include the addition of coverage for a yearly screening
pap smear for Medicare beneficiaries at high risk of developing cervical or
vaginal cancer and for beneficiaries of childbearing age who had not had a
negative test in each of the preceding three years, effective January, 1, 1998,
as well as coverage for annual prostate cancer screening, including a
prostate-specific antigen blood test, for beneficiaries over age 50, effective
January 1, 2000. Although most women of childbearing age and men under age 65
are not Medicare beneficiaries, the addition of Medicare coverage for these
tests could provide additional revenues for the Company.

         Other changes in government and other third-party payor reimbursement
which may result from the enactment of health care reform or of deficit
reduction or balanced budget legislation also likely will continue the downward
pressure on prices and make the market for clinical laboratory services more
competitive. For example, the BBA revises the Medicare program substantially to
permit beneficiaries to choose between traditional fee-for-service Medicare and
several non-traditional Medicare options, including managed care plans and
provider-sponsored organization plans. These non-traditional Medicare plans have
considerable discretion in determining whether and how to cover and reimburse
clinical laboratory services and to limit the number of labs with which they
deal.

         The BBA also includes provisions to implement competitive bidding for
certain Medicare items and services, including laboratory services, on a
three-site demonstration project basis. These changes likely would have an

                                       4
<PAGE>
adverse impact on the Company's revenues if adopted on a widespread basis.
Finally, the BBA contains measures to establish market-oriented purchasing for
Medicare, including prospective payment systems for outpatient hospital
services, home health care, and nursing home care. In addition, the BBA requires
consolidated billing directly by the facility for laboratory and other services
provided to residents of skilled nursing facilities effective July 1, 1998.
Although the details of how these measures will be implemented are yet to be
finalized, they probably will increase pressure on pricing in the clinical
laboratory industry and may have an adverse impact on the Company's revenues.

         Because of the uncertainties about how the Medicare changes such as
those described above will be implemented, the Company currently is unable to
predict their ultimate impact on the clinical laboratory industry generally or
on the Company in particular. Even apart from federal legislative action,
reforms may occur at the state level and changes are occurring in the
marketplace as a result of market pressures, including the increasing number of
patients covered by some form of managed care. In general, these changes are
likely to put a downward pressure on price and also may act to limit access by
some laboratories to some managed care patient groups. Because of the
uncertainties about the exact nature, extent, and timing of any such changes,
however, the Company currently is unable to predict their ultimate impact on the
clinical industry generally or on the Company in particular.

         Medicare Payment for Anatomic Pathology Services. In addition to
furnishing clinical chemistry laboratory testing services, the Company furnishes
a number of services which are characterized for the purposes of the Medicare
program as anatomic pathology services. Medicare reimbursement for these
services constituted approximately 40%, 45%, and 46% of the Company's net
anatomic pathology revenues in 1997, 1996, and 1995, respectively. As of January
1, 1992, all physician services, including anatomic pathology services, have
been reimbursed by Medicare based on a methodology known as the resource-based
relative value scale ("RBRVS"), which was fully phased in by the end of 1996.
Overall, anatomic pathology reimbursement rates declined during the fee schedule
phase-in period, despite an increase in payment rates for certain pathology
services performed by the Company.

         The Medicare RBRVS payment for each service is calculated by
multiplying the total relative value units ("RVUs") established for the service
by a conversion factor that is set by statute. The number of RVUs assigned to
each service is in turn calculated by adding three separate components:
physician work, practice expense, and malpractice expense. Although originally
there were three conversion factors, the BBA has merged them into one effective
January 1, 1998. The new conversion factor is $36.6873, approximately an 8.4%
increase over the 1997 conversion factor applicable to pathology services.
However, due to other relatively more minor changes in the RBRVS formula for
1998, the overall impact on the payment rate for pathology services furnished by
the Company likely will be increased slightly.

         In 1997, there was an overall decrease of 5.7% in payments for
pathology services due to a five-year review of the work value component and a
decrease in the 1997 conversion factor applicable to pathology services, plus an
additional decrease in Connecticut, where the Company's primary operations are
located, because of the Health Care Financing Administration's (HCFA) reduction
of the number of different payment localities recognized for RBRVS purposes.
Also in 1997, HCFA published proposed regulations that would recalculate the
practice expense RVUs to reflect resource consumption, rather than the
historical charge data used to establish the original practice expense RVUs.
Overall, HCFA's predicted impact of resource-based practice expense RVUs on
Medicare income of pathologists is an increase of 1%. Of course, the actual
impact on Medicare pathology revenues would depend on the mix of pathology
services furnished. Moreover, under the BBA, implementation of resource-based
practice expense RVUs will not begin until 1999 and will be phased in over the
period 1999 to 2002. In addition, disclosure and evaluation of the methodology
used by HCFA to support its proposal will be required prior to implementation.

         In the past, the Company has been able to offset a substantial portion
of the impact of the reduced Medicare reimbursement rates for anatomic pathology
services through the achievement of economies of scale and the introduction of
alternative technologies that will not depend on reimbursement through the RBRVS
system. Despite these offsets, the substantial modifications to the physician
fee schedule in 1997, even as countered by a higher conversion factor and
possibly by the adoption of a resource-based practice expense system in 1999 to
2002, plus the still growing impact of managed care, likely will continue to
have a negative effect on the Company's average unit price. Other potential
legislative and market changes may continue this trend; however, the Company is
not able to predict the exact nature or effect of any other potential changes
affecting its reimbursement for anatomic pathology services at this time.

                                       5
<PAGE>
         Other Developments Affecting Reimbursement. In 1997, approximately 16%
of the Company's net revenues were in the State of New York. In September, 1996,
New York passed the New York Health Care Reform Act of 1996 ("NYHCRA"). The
NYHCRA requires payors to pay an 8.18% surcharge on the services provided by a
variety of providers, including independent laboratories for services rendered
to residents of the State of New York. If the payor neglects to pay the 8.18%
surcharge directly, providers are required to collect the surcharge plus an
additional assessment of 24% for a total surcharge of 32.18%. Under the NYHCRA,
it is possible that independent labs, such as the Company, will be placed at a
competitive disadvantage with physician office labs and other labs whose
services are not subject to the surcharge. In addition, independent labs
probably will be liable for the surcharge even if the payor fails to pay the
laboratory. Moreover, payors may reduce the fees they pay for laboratory
services in order to offset the surcharge. The New York State Clinical
Laboratory Association, which brought suit against the New York State Department
of Health alleging that these provisions of NYHCRA are unconstitutional under
the United States and New York State Constitutions and should not be enforced,
is currently appealing an adverse decision on its challenge by the New York
lower court. This association also is working to amend the law. Nonetheless, the
law currently is being implemented and could have a negative impact on the
portion of the Company's net revenues derived from the State of New York.

         Following a study of pricing practices in the clinical laboratory
industry, the Office of the Inspector General ("OIG") of HHS conducted a study
of such practices, and in January 1990 issued a final report. This report
addresses how these pricing practices relate to Medicare and Medicaid. The OIG
reviewed the industry's use of one fee schedule for physicians and other
professional accounts and another fee schedule for patients/third-party payors,
including Medicare, in billing for testing services, and focused specifically on
the pricing differential when profiles (or established groups of tests) are
ordered.

         Existing federal law authorizes the Secretary of HHS to exclude
providers from participation in the Medicare and Medicaid programs if they
charge state Medicaid programs or Medicare fees "substantially in excess" of
their "usual charges". On January 29, 1992, in the preamble to a Final Rule
implementing program exclusion and civil money penalty authorities established
under the Medicare and Medicaid Patient and Program Protection Act of 1987, the
OIG considered but declined to provide any standards as to when charges for a
service are considered "substantially in excess" of a provider's "usual
charges". However, the OIG stated that it will continue to evaluate the billing
patterns of individuals and entities, including clinical laboratories, on a
case-by-case basis. Then on September 8, 1997, OIG proposed to amend the
exclusion rule to indicate that OIG could exclude a provider that had submitted
claims containing charges substantially in excess of their usual charges for
services furnished to any of its customers, clients or patients. Although no
final rule has as yet been published, the Company is aware that OIG has
informally indicated it will not adopt this proposed amendment. The Medicaid
laws in some states also have prohibitions related to discriminatory pricing.
The Company employs practices similar to those examined in the 1990 OIG report
discussed above in billing for its services. Depending upon the nature of any
regulatory or enforcement action taken or the content of legislation, if any,
which might be adopted to address this issue, the Company could experience a
significant decrease in revenue which could have a material adverse effect on
the Company. The legislation also provides for civil or criminal penalties or
exclusion from participation in Medicare and Medicaid. The Company is unable to
predict at this time whether any further regulatory, enforcement, or legislative
action will be taken.

         In December 1992, an unrelated clinical laboratory, National Health
Laboratories, Inc., ("NHL"), pleaded guilty to submitting false medical
reimbursement claims to the United States government, and entered into a
settlement which provides for payment of over $100 million. The United States
government alleged that NHL, by marketing to physicians diagnostic test panels
which bundled, together with a routine blood chemistry series, two other tests
(ferritin and HDL cholesterol), induced physicians to order these other tests
regardless of medical necessity. While NHL's additional charge to physicians for
these two tests ordered as part of the NHL panel was nominal, NHL billed the
Medicare program for them at full price. Since 1993 and continuing to the
present, other laboratories have reached significant financial settlements with
the government in cases involving similar issues. While it is not possible to
predict how broadly the United States government may seek to expand the theory
of liability it developed in these cases, the Company believes its practices
differ materially from those at issue.

         In February, 1997, the OIG released a model compliance plan for
laboratories that is based largely on the corporate integrity agreements
negotiated with the laboratories which settled the government's enforcement
actions. The Company has reviewed the model compliance plan and is adopting, or
modifying for adoption, aspects of the model plan that the Company deems
appropriate to the conduct of its business. One key aspect of the corporate
integrity agreements and the model compliance plan is an emphasis on the
responsibilities of laboratories to notify physicians that Medicare covers only
medically necessary services. These requirements, and their likely effect on
physician test ordering habits, focus on chemistry tests, especially routine

                                       6
<PAGE>
tests, rather than on anatomic pathology services or the non-automated tests
which make up the majority of the Company's business measured in terms of net
revenues. Nevertheless, they potentially could affect physician test ordering
habits more broadly. The Company is unable to predict whether, or to what
extent, these developments may have an impact on the utilization of the
Company's services.

         The Medical Director of the Connecticut Medicare carrier to whom the
Company submits its Medicare claims has orally expressed the view that some
amount of money which the carrier has paid to the Company for certain pathology
services involving DNA measurements in prostate tumor cells (morphometric
analysis of tumor) potentially is recoverable by the carrier. (The company is
not presently submitting claims for this service.) The carrier Medical Director
has never reduced his view to writing or otherwise asserted a claim.
Accordingly, at this time, the Company cannot evaluate any such possible claim,
or the probability of assertion of any such claim.

         During 1997, the Company was made aware that an agent based in the
Hartford, Connecticut branch of the U.S. Department of Health and Human Services
Office of the Inspector General ("OIG") was investigating the Company's practice
of supplying pathology specimen collection devices without charge to physician
customers as well as unspecified billing issues that had been raised by the
local medicare carrier. The Company believes that its practices with respect to
specimen collection devices were proper, and a letter describing the Company's
actions and its views regarding applicable regulations was sent by the Company
to the OIG. That letter also requested information about any billing issues of
concern to the OIG so that the Company could address them. As of the date of
this report, the Company had not received a response from or otherwise been
contacted by the OIG regarding these matters, and has not received any formal
notification regarding the matter.

         Although the Company seeks to structure its practices to comply with
all applicable laws, and management believes such practices are in compliance,
uncertainty nevertheless exists as to how these matters may develop, and the
Company currently is unable to predict their impact, if any, on the Company.
While management does not believe that this matter will have a material adverse
effect on the Company's financial condition, if the carrier and/or OIG agent
were to pursue and prevail on these matters, any significant recoupment of funds
or civil or criminal penalty potentially resulting from such proceedings could
have a material adverse effect on the Company's business and its results of
operations.

COMPETITION

         The Company provides services in a segment of the healthcare industry
that is intensely competitive, both with respect to clinical chemistry as well
as anatomic pathology. The Company estimates that there are over 11,500
laboratories in the United States which might be deemed actual or potential
competitors for the testing business of cancer-treating or cancer-diagnosing
physicians.

         On the one hand, the anatomic pathology segment is highly fragmented
and has not yet experienced industry consolidation to any significant degree.
Competitors include physician-owned laboratories, specialized commercial
laboratories and hospital laboratories. None of these competitors have a
material share of the anatomic pathology market.

         The clinical chemistry segment, on the other hand, has been
consolidated to an extent and is dominated by the three largest national
clinical laboratories in the U.S., Quest Diagnostics, Smith-Kline and Laboratory
Corporation of America. The Company estimates these competitors accounted for
more than 40% of the total non-hospital clinical laboratory market in 1997.
Their product offerings are broader and they have more substantial financial and
operational resources than the Company. Other competitors in this segment
include special-purpose clinical laboratories and manufacturers of test kits and
other diagnostic tools.

         In addition to the competition for customers, there is increasing
competition for qualified personnel, particularly in the laboratory. To date,
such competition has not had an adverse impact on the Company's operations.

         Significant factors that enhance the Company's ability to compete
effectively include a highly-trained and knowledgeable sales force, high quality
laboratory operations, accurate and consistent test results, quality of service
to physicians, price, and speed of turnaround for test results.

                                       7
<PAGE>
PATENTS AND PROPRIETARY TECHNOLOGY

         To date, the Company has not relied heavily on patents or licensed
technology in its business. Tests or related diagnostic products purchased by
the Company may or may not be patented. There can be no assurance that such
tests or related products do not infringe patent rights of others. Any such
infringement could give rise to claims against the Company. Typically the
Company is not indemnified against such risks. There can be no assurance that
any issued patent upon which the Company relies directly or indirectly will
afford protection to the Company in the face of challenges to the patent's
validity.

         Other private and public entities, including universities, have filed
applications for (or have been issued) patents in the Company's field and may
obtain additional patents and other proprietary rights to technology that may be
the same as or similar to that utilized by the Company. The scope and validity
of such patents, the extent to which the Company may wish or need to acquire
such rights, and the cost or availability of such rights are presently unknown.
There can be no assurance that others may not obtain access to the Company's
technology or independently develop the same or similar technology to that
utilized by the Company.

         The Company believes the Year 2000 IT issues are not material and will
require minimal resources to resolve.

EMPLOYEES

         On December 31, 1997, the Company had 396 full-time and 33 part-time
employees.

REGULATORY MATTERS

         The Company's business is subject to governmental regulation at the
federal, state and local levels, some of which regulations are described under
"Laboratory", "Food and Drug Administration" and "Other" below.

         LABORATORY

         The Company's laboratory is certified or licensed under the federal
Medicare program, the Connecticut Medicaid program and the Clinical Laboratories
Improvement Act of 1967, as amended by the Clinical Laboratory Improvement
Amendments of 1988 (collectively, "CLIA '88"). Licensure is maintained under the
clinical laboratory licensure laws of Connecticut, where the Company's clinical
laboratory is located and under the laws of several other jurisdictions. The
Company believes it has obtained all material laboratory licenses required for
its operations. In addition, the laboratory is licensed by the federal Nuclear
Regulatory Commission and is accredited by the College of American Pathology.

         The federal and state certification and licensure programs establish
standards for the day-to-day operation of a medical laboratory, including, but
not limited to, personnel and quality control. Compliance with such standards is
verified by periodic inspections by inspectors employed by federal or state
regulatory agencies. In addition, federal regulatory authorities require
participation in a proficiency testing program approved by the HHS for each of
the specialties and subspecialties for which a laboratory seeks approval from
Medicare or Medicaid and licensure under CLIA '88. Proficiency testing programs
involve actual testing of specimens that have been prepared by an entity running
an approved program for testing by the laboratory.

         A final rule implementing CLIA `88, published by HHS on February 28,
1992, became effective September 1, 1992. This rule has been revised on several
occasions and further revision is expected in 1998. The CLIA rule covers all
laboratories in the United States, including the Company's laboratory. The
Company has reviewed its operations as they relate to CLIA, including, among
other things, the CLIA rule's requirements regarding laboratory administration,
participation in proficiency testing, patient test management (including patient
preparation, proper specimen collection, identification, preservation,
transportation, processing and result reporting), quality control, quality
assurance and personnel for the types of testing undertaken by the Company, and
believes it to be in compliance with these requirements. However, no assurances
can be given that the Company's laboratory will pass all future inspections
conducted to ensure compliance with CLIA `88 or with any other applicable
licensure or certification laws.

                                       8
<PAGE>
         Existing federal laws governing Medicare and Medicaid, as well as some
state laws, also regulate certain aspects of the relationship between healthcare
providers, including clinical laboratories, and their referral sources,
including physicians, hospitals and other laboratories. One provision of these
laws, known as the "anti-kickback law," contains extremely broad proscriptions,
and relatively little regulatory guidance or judicial precedent exists
concerning its application. Violation of this provision may result in criminal
penalties, exclusion from Medicare and Medicaid and, as of August 5, 1997,
significant civil monetary penalties. Pronouncements from the OIG have indicated
that enforcement resources may be focused on financial arrangements between
laboratories and physicians and other purchasers of laboratory services,
including, for example, arrangements under which laboratories supply physicians'
offices with phlebotomists (blood-drawing technicians) who potentially could
perform additional tasks that normally are the responsibility of the physician
office staff. Under another provision, known as the "Stark" law or
"self-referral prohibition", physicians who have an investment or compensation
relationship with an entity furnishing clinical laboratory services (including
clinical chemistry and anatomic pathology services) may not, subject to certain
exceptions, refer clinical laboratory testing for Medicare patients to that
entity. Similarly, laboratories may not bill Medicare or Medicaid or any other
party for services furnished pursuant to a prohibited referral. Violation of
these provisions may result in disallowance of Medicare and Medicaid claims for
the affected testing services, as well as the imposition of civil monetary
penalties. On August 14, 1995, HHS published a Final Rule implementing this
prohibition on Medicare referrals. On January 9, 1998, in a proposed rule
implementing an extension of the Stark law to other (non-laboratory) services,
HHS proposed some changes in the regulation applicable to laboratories. The
Company does not expect these changes, if they are finalized, to have a major
effect on the Company. The Company seeks to structure its arrangements with
physicians and other customers to be in compliance with the anti-kickback, Stark
and state laws, and to keep up-to-date on developments concerning their
application by various means including consultation with legal counsel. However,
the Company is unable to predict how these laws will be applied in the future,
and no assurances can be given that its arrangements will not become subject to
scrutiny under them. The Company has a compliance committee which meets on a
regular basis to review various operations and relationships as well as adopt
policies.

         Any exclusion or suspension from participation in the Medicare and
Medicaid programs, any loss of licensure or accreditation, or any inability to
obtain any required license or permit, whether arising from any action by HHS,
any state, or any other regulatory authority, would have a material adverse
effect on the Company's business. Any significant civil or criminal penalty
resulting from such proceedings could have a material adverse effect on the
Company's business.

         FOOD AND DRUG ADMINISTRATION

         The FDA does not currently regulate laboratory testing services, which
is the Company's principal business. However, the Company performs some testing
services using test kits purchased from manufacturers for which FDA premarket
clearance or approval for commercial distribution in the United States has not
been obtained by the manufacturers ("investigational test kits"). Under current
FDA regulations and policies, such investigational test kits may be sold by
manufacturers for investigational use only if certain requirements are met to
prevent commercial distribution. The manufacturers of these investigational test
kits are responsible for marketing them under conditions meeting applicable FDA
requirements. In January 1998, the FDA issued a revised draft Compliance Policy
Guide (CPG) that sets forth FDA's intent to undertake a heightened enforcement
effort with respect to investigational test kits improperly commercialized prior
to receipt of FDA premarket clearance or approval. That draft CPG is not
presently in effect but, if implemented as written, would place greater
restrictions on the distribution of investigational test kits. If the Company
were to be substantially limited in or prevented from purchasing investigational
test kits by reason of the FDA finalizing the new draft CPG, there could be
adverse effects on the Company's ability to access new technology, which could
have a material adverse effect on the Company's business.

         The Company also performs some testing services using reagents, known
as analyte specific reagents ("ASRs"), purchased from companies in bulk rather
than as part of a test kit. In November 1997, the FDA issued a new regulation
placing restrictions on the sale, distribution, labeling and use of ASRs, such
as those used by the Company. Most ASRs will be treated by the FDA as low risk
devices, requiring the manufacturer to register with the agency, list its ASRs
(and any other devices), conform to current good manufacturing practice
("CGMPs"), and comply with medical device reporting of adverse events. A smaller
group of ASRs, primarily those used in blood banking and/or screening for fatal
contagious diseases (e.g., HIV / AIDS), will be treated as higher risk devices
requiring premarket clearance or approval from the FDA before commercial
distribution is permitted. The imposition of this new regulatory framework on
ASR sellers may reduce the availability or raise the price of ASRs purchased by
the Company. In addition, when the Company performs a test developed in-house,
using reagents rather than a test kit cleared or approved by the FDA, it will be

                                       9
<PAGE>
required to disclose those facts in the test report. However, by clearly
declining to impose any requirement for FDA premarket approval or clearance for
most ASRs, the new rule removes one barrier to reimbursement for tests performed
using these ASRs. In light of all the foregoing factors, it is impossible to
predict exactly how the new regulation will affect the Company's business, and
thus there can be no assurance that the new ASR regulation will not have a
material adverse effect on the Company's business.

         OTHER

         Certain federal and state laws govern the handling and disposal of
medical specimens, infectious and hazardous wastes and radioactive materials.
Failure to comply with such laws could subject an entity covered by these laws
to fines, criminal penalties and/or other enforcement actions.

         Pursuant to the Occupational Safety and Health Act, laboratories have a
general duty to provide a work place to their employees that is safe from
hazard. Over the past few years, the Occupational Safety and Health
Administration ("OSHA") has issued rules relevant to certain hazards that are
found in the laboratory. In addition, OSHA recently has promulgated final
regulations containing requirements healthcare providers must follow to protect
workers from bloodborne pathogens. Failure to comply with these regulations,
other applicable OSHA rules or with the general duty to provide a safe work
place could subject an employer, including a laboratory employer, to substantial
fines and penalties.

ITEM 2.  PROPERTIES

         The Company leases approximately 90,850 square feet of office and
laboratory space in Stratford, Connecticut and Wilmington, Ohio. For the
Stratford, Connecticut facilities, one lease expires in May 2003 and contains an
option to renew for up to three years and the other is on a year-to-year basis.

         The lease for the Wilmington, Ohio facility has a five year term
commencing April 1, 1996 and a renewal option for five additional terms of three
years each.

         The Company also leases four regional sales offices located in Florida,
North Carolina, Texas and Ohio. The terms of the leases range from one to three
years.

         On February 1, 1998, the Company acquired certain assets of a pathology
laboratory located in Tampa, Florida, and in connection therewith, entered into
a lease for an office and laboratory facility for a five-year term commencing
January 31, 1998 with an option to renew for an additional five-year period. In
addition, the Company assumed leases for four branch offices in Florida with
remaining terms of up to two years.

(See Note 4 to the Company's consolidated financial statements included
herewith).

ITEM 3.  LEGAL PROCEEDINGS

         On November 19, 1997, a suit was filed against the Company in the
United States District Court, District of South Carolina (Frances P. Hadden v.
DIANON Systems, Inc.). The complaint alleges, among other things, medical
malpractice due to an incorrect diagnosis and seeks $10 million in damages. The
case has been forwarded to the Company's insurance carrier, which has
acknowledged that coverage is available for any costs incurred or amount paid by
the Company in connection with the suit, subject to policy deductibles and
limits. In the opinion of management, based upon the availability of insurance
and other considerations, this suit should not have a material adverse effect on
the Company.

         There are no other known material legal proceedings against the
Company.


                                       10
<PAGE>
ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

         On October 30, 1997, the Company held its 1997 Annual Meeting of
Shareholders at which the following actions were approved: directors were
elected and the appointment of Arthur Andersen, LLP ("Arthur Andersen") as the
Company's independent public accountants for the calendar year ended December
31, 1997 was ratified. At the 1997 Annual Meeting of Shareholders, Messrs. Kevin
C. Johnson, John P. Davis, E. Timothy Geary, G.S. Beckwith Gilbert and Jeffrey
L. Sklar, and Dr. James B. Amberson were elected as directors of the Company.
The table below represents the votes cast:

                   Director                   In Favor             Withheld
                   --------                   --------             --------

          James B. Amberson, M.D.            6,429,430              12,800
          John P. Davis                      6,420,534              21,696
          E. Timothy Geary                   6,429,330              12,900
          G.S. Beckwith Gilbert              6,429,430              12,800
          Kevin C. Johnson                   6,424,842              17,388
          Jeffrey L. Sklar                   6,429,430              12,800

         The other action taken at the Company's 1997 Annual Meeting of
Shareholders, to ratify appointment of Arthur Andersen as the Company's
independent public accountant for the calendar year ending December 31, 1997,
had the following votes cast:

                      For               Withheld            Absentions
                      ---               --------            ----------

                  6,426,232              11,498               4,500





                                       11
<PAGE>
                                     PART II



ITEM 5.  MARKET FOR THE REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER 
         MATTERS

         DIANON's Common Stock trades on The Nasdaq Stock Market under the
symbol "DIAN". The following table shows the high and low sales prices of the
Company's Common Stock quoted on The Nasdaq Stock Market, for the periods
indicated below:

                                                  High               Low
                                                  ----               ---
               1996:
               First Quarter                     $5-1/2             $3-3/8
               Second Quarter                     8-5/8              4-1/8
               Third Quarter                      7-3/8              4-1/2
               Fourth Quarter                     9-5/16             6-3/8

               1997:
               First Quarter                      12-1/2             8-1/8
               Second Quarter                     10-1/2             8-3/8
               Third Quarter                      10-3/8             7-3/4
               Fourth Quarter                     10                 7-1/2



                  As of March 16, 1998, the Company had approximately 2,676
shareholders of record. No dividends have been paid by DIANON and it is not
anticipated that any will be paid in the foreseeable future.







                                       12
<PAGE>
ITEM 6.    SELECTED FINANCIAL DATA

STATEMENT OF OPERATIONS:

<TABLE>
<CAPTION>
                                                1997            1996           1995          1994            1993
                                                ----            ----           ----          ----            ----
                                                              (in thousands, except per share data)
                                                              -------------------------------------
<S>                                          <C>              <C>           <C>            <C>            <C>
Net revenues                                   $60,887         $56,000       $45,700        $41,017        $38,250

Gross profit                                    29,766          29,101        25,310         24,300         24,311

Expenses:
     Selling, general and
administrative expenses (1)                     22,912          22,443        19,620         17,505         18,817
     Research and development                    1,666           3,157         5,255          4,512          4,342
                                          ------------- --------------- ------------- -------------- --------------

Income from operations                           5,188           3,500           435          2,283          1,152

Net interest income (expense)                      523             307           181           (90)           (36)
Provision for income taxes (2)                   2,413           1,637           509            832            270
                                          ============= =============== ============= ============== ==============
Net income                                     $ 3,298         $ 2,170      $    107        $ 1,361       $    846
                                          ============= =============== ============= ============== ==============

EPS:
     Basic                                   $     .51       $     .35     $     .02      $     .26      $     .16
     Diluted                                 $     .48       $     .35     $     .02      $     .26      $     .16

Weighted average shares outstanding
     Basic                                       6,430           6,151         5,542          5,297          5,246
     Diluted                                     6,808           6,287         5,549          5,308          5,329


BALANCE SHEET DATA:

Working capital                                $21,387         $18,058       $16,974        $11,931        $11,110
Total assets                                    36,889          34,536        30,455         25,206         24,614
Long-term obligations                              107             272           750          1,674          2,519
Stockholders' equity (3)                        29,046          26,549        23,452         18,664         17,147

</TABLE>

(1)    During 1997, 1996, 1995, 1994 and 1993, non-recurring charges relating to
       severance, restructuring, accelerated amortization and other one-time
       costs of $324,000, $609,000, $2,668,000, $692,000 and $2,542,000,
       respectively, were incurred. (See Notes 2, 7, 10 and 12 to the Company's
       consolidated financial statements included herewith).
(2)    The Company's provision for income taxes in 1995, 1994 and 1993 includes
       the benefit received from the utilization of tax credits. (See Note 3 to
       the Company's consolidated financial statements included herewith).
(3)    No dividends were paid by the Company during the periods presented above.


                                       13
<PAGE>
ITEM 7.   MANAGEMENT'S DISCUSSION AND ANALYSIS OF RESULTS OF OPERATIONS AND 
          FINANCIAL CONDITION.


         The Company's results of operation over the three-year period ended
December 31, 1997 reflects its investment in and movement toward an anatomic
pathology strategy. Several initiatives begun in 1995 and prior years, such as
operational restructurings and capital investments to build the anatomic
pathology product line, came to fruition in 1996 and 1997 and resulted in a
dramatic improvement in the Company's profitability.

RESULTS OF OPERATIONS


o        NET REVENUES

         Net revenues increased to $60.9 million in 1997 from $56.0 million in
1996 and $45.7 million in 1995, representing annual increases of 8.7% and 22.5%,
respectively. The strong revenue growth reflects the Company's increased
penetration in the anatomic pathology segment, offset somewhat by reimbursement
pressures (primarily impacting the clinical chemistry segment) and somewhat
reduced volume in clinical chemistry and hospital-based tissue testing services.

o        COST OF SALES

         Cost of sales, which consists primarily of payroll, laboratory
supplies, outside services, logistics (shipping and handling) and depreciation
expense, increased to $31.1 million in 1997 from $26.9 million in 1996 and $20.4
million in 1995. As a percentage of sales, cost of sales totaled 51.1%, 48.0%
and 44.6%, respectively. The increasing percentage of revenue represented by
cost of sales largely reflects the Company's strategic focus on anatomic
pathology. This market segment requires a larger laboratory work force,
resulting in an increase in salaries and wages from $6.1 million in 1995 to $8.7
million in 1996 and further to $10.9 million in 1997. In addition, overhead
expenses (primarily building rent, utilities, and depreciation) increased from
$5.5 million in 1995 to $7.9 million in 1996 and $9.0 million in 1997. These
increases reflect additional facilities expenses associated with the
introduction of the anatomic pathology line, and more specifically the initial
expansion and equipping of the Company's facilities in 1996. Logistics expenses
rose to $5.8 million in 1997 from $4.6 million in 1996 and $4.0 million in 1995
due to increased volume. Cost of lab supplies decreased modestly to $5.4 million
in 1997 from $5.7 million in 1996, after increasing from $4.8 million in 1995
due to higher volume and increased costs for reagents used in certain of the
Company's testing services. However, as a percentage of sales, the cost of lab
supplies decreased over the period from 10.5% in 1995 to 8.8% in 1997.


o        GROSS PROFIT

         Gross profit totaled $29.8 million in 1997 versus $29.1 million in 1996
and $25.3 million in 1995, while gross profit margins were 48.9%, 52.0% and
55.4% respectively. The increase in anatomic pathology sales as a percentage of
total sales results in higher average unit pricing with lower gross margin
percentages, due to the higher costs associated with providing these services.
Gross margins have been further reduced due to the erosion of the average price
reimbursed for certain clinical chemistry testing services.

         The clinical laboratory industry, which includes both clinical
chemistry and anatomic pathology, has seen steady and continuing downward
pressure on prices exerted by both government and private third party payors.
Also, payment for services such as those provided by the Company is and likely
will continue to be affected by periodic reevaluations made by payors concerning
which services to reimburse and which to cease reimbursing.

         The reduction in reimbursement rates, particularly by Medicare,
generally has decreased the average unit price for most of the Company's
clinical chemistry services each year. In keeping with this trend, as part of
OBRA `93 and the BBA, Congress reduced over time the national cap on Medicare
laboratory fee schedules (under which the Company's clinical chemistry services
are reimbursed). This national cap has been lowered each year and now is 74% of
the national median. OBRA `93 also eliminated the annual updates of Medicare
laboratory fee schedules for the years 1994 and 1995. After updates of 3.2% in
1996 and approximately 2.7% in 1997, the BBA freezes fee schedule payments for
the 1998 - 2002 period.

                                       14
<PAGE>
         With respect to the Company's anatomic pathology services, which are
not reimbursed under the Medicare laboratory fee schedules, the Medicare fees
for these services also generally declined with the implementation of the RBRVS
system which went into effect in 1992 and was fully phased in by the end of
1996. In 1997, there was an overall decrease of 5.7% in payments for pathology
services due to a five-year review of the work value component and a decrease in
the 1997 conversion factor applicable to pathology services, plus an additional
decrease in Connecticut, where the Company's primary operations are located,
because of the Health Care Financing Administration's (HCFA) reduction of the
number of different payment localities recognized for RBRVS purposes. Although
the conversion factor (which is a component of the reimbursement calculation)
increased by 8.4% in 1998, the overall impact on the Company's revenues will be
only modestly positive due to, among other factors, other changes in the RBRVS
formula in 1998.

         Other changes in government and other third-party payor reimbursement,
which may come about as a consequence of enactment of health care reform or of
deficit reduction or balanced budget legislation, are also likely to continue
the downward pressure on prices and make the market for clinical laboratory
services more competitive. The provisions of the BBA that permit beneficiaries
to select non-traditional Medicare plan options, implement competitive bidding
for certain Medicare items and services, and establish market-oriented
purchasing for Medicare, previously described in the reimbursement section, are
examples. Because of the uncertainties about how these Medicare changes will be
implemented, the Company currently is unable to predict their ultimate impact on
the clinical laboratory industry generally or on the Company in particular.

         Even apart from federal legislative action, reforms may occur at the
state level and changes are occurring in the marketplace as a result of market
pressures, including the increasing number of patients covered by some form of
managed care. In the past, the Company has offset a substantial portion of the
impact of price decreases and coverage changes through the achievement of
economies of scale and other strategies such as more favorable purchase
contracts and the introduction of alternative technologies. However, if price
decreases (for example arising from the Medicare changes discussed above) or
coverage changes were to be rapidly and fully implemented, they would be likely
to have an adverse impact on gross profits from the Company's testing services
until management was able to mitigate such impact. Furthermore, in recent years
the Company's gross profit margin has trended down from over 55% to 47%, and
there can be no assurances that such trends may not continue.

         See also discussion under "Business-Reimbursement."

o        SELLING, GENERAL AND ADMINISTRATIVE EXPENSES

         Selling, general and administrative expenses increased from $19.6
million in 1995 to $22.4 million in 1996, with another modest increase in 1997
to $22.9 million. As a percentage of sales, selling, general and administrative
expenses decreased over the period from 42.9% in 1995 to 37.6% in 1997, as the
Company began to realize operating leverage in this area. Selling expenses were
$10.1 million in 1997, or 16.7% of sales, versus $10.6 million in 1996 and $9.7
million in 1995, or 19.0% and 21.2% of sales, respectively. The decrease in
selling expenses was offset somewhat by growth in general and administrative
expenses.

         In addition, 1995 reflects the impact of several charges of a
non-recurring nature recorded by the Company, including: i) a $765,000
accelerated amortization charge based on management's estimate of future
benefits anticipated from a customer list; ii) a severance charge of $595,000
resulting from the streamlining of operating expenses and the resignation of
certain officers of the Company; iii) a $530,000 write-down of an investment in
common stock of a publicly-traded company (which was subsequently written-off in
1996 with a $62,000 charge); and iv) a $279,000 restructuring provision related
to management's decision to discontinue the Company's European-based operations.


o        RESEARCH AND DEVELOPMENT

         Research and development expenses decreased from $5.3 million in 1995
to $3.2 million in 1996 and $1.7 million in 1997. The higher expense in 1995 and
1996 reflects the costs associated with launching the anatomic pathology testing
services, including the cost of building the Company's database. The reduction
in 1997 reflects the completion of this launch, and the resulting expense
primarily represents the Company's continuing evaluation of existing and new
technologies.

                                       15
<PAGE>
o        INCOME FROM OPERATIONS

         Income from operations increased from approximately $435,000 in 1995 to
$3.5 million in 1996 and $5.2 million in 1997, reflecting the factors discussed
above and especially the Company's investment in, and shift toward, an anatomic
pathology strategy.

o        NET INTEREST INCOME

         Net interest income grew to $522,000 in 1997, from $307,000 in 1996 and
$181,000 in 1995. This reflects the increased cash and cash equivalent position
of the Company over the period, partially resulting from cash generated by
operations and partially resulting from the private placement in 1995 as further
described in Note 13 of the Consolidated Financial Statements included elsewhere
herein.

o        PROVISION FOR INCOME TAXES

         The provision for income taxes increased from $509,000 in 1995 to $1.6
million in 1996 and $2.4 million in 1997, reflecting the increased profitability
of the Company. The effective tax rate was 82.6%, 43.0% and 42.2%, respectively,
with the high tax rate in 1995 reflecting the non-deductibility of certain
charges, primarily the aforementioned investment write-down of $530,000.

o        NET INCOME

         Net income increased 52% to $3.3 million in 1997, from $2.2 million in
1996 and $107,000 in 1995. The dramatic profitability improvements reflect the
Company's investment in and shift toward an anatomic pathology strategy.

         Basic earnings per share increased 45.7% in 1997 to $0.51 per share,
from $0.35 per share in 1996 and $0.02 per share in 1995. Diluted earnings per
share increased 37.1% in 1997 to $0.48 per share, from $0.35 per share in 1996
and $0.02 per share in 1995.


LIQUIDITY AND CAPITAL RESOURCES

         At December 31, 1997, the Company had total cash and cash equivalents
of $12.4 million, substantially all of which was invested in a fund holding U.S.
Treasury securities with maturities of less than three months. Working capital
was $21.4 million versus $18.1 million as of December 31, 1996, and the current
ratios were 3.8:1 and 3.4:1, respectively.

         Accounts receivable (net of allowances) totaled $14.4 million as of
December 31, 1997 representing approximately 90 days of average sales, compared
to $15.4 million as of December 31, 1996 or 79 days of average sales. The
increase in days sales outstanding is a result of growth in the anatomic
pathology segment and its associated billing complexity which results in a
higher DSO.

         Capital expenditures for 1997, 1996 and 1995 were $1.9 million, $3.4
million and $2.3 million, respectively. Expenditures in 1997 primarily related
to the expansion of the Company's laboratory facilities and the purchase of a
new mainframe computer system.

         Effective February 17, 1998, the Company entered into a three-year, $15
million line of credit agreement with a bank. The agreement includes various
financial covenants.

         On October 5, 1995 the Company completed a $5.6 million private
placement with an investor for one million shares of Common Stock and a two-year
warrant for 800,000 shares. Proceeds (net of expenses) from the placement of the
shares and the exercise of the warrants approximated $4.7 million in 1995 and
$4.0 million in 1996. See Note 13 of the Consolidated Financial Statements
contained elsewhere herein.

         As of December 31, 1997, the Company has purchased 197,617 shares of
Common Stock as required by its Employee Stock Purchase Plan ("ESPP"). The
Company's Board of Directors has authorized the expenditure of up to $2 million
for additional share repurchases.

                                       16
<PAGE>
         The Company believes that cash flows from operations and available cash
and cash equivalents are adequate to fund the Company's operations for the
foreseeable future.

Risk Factors; Forward Looking Statements

         The Management's Discussion and Analysis and the information provided
elsewhere in this 10K (including, without limitation, in the third and fourth
paragraphs of "Item 1. Business" and under "Gross Profit" and "Liquidity and
Capital Resources" above) contain forward looking statements regarding the
Company's future plans, objectives, and expected performance. These statements
are based on assumptions that the Company believes are reasonable, but are
subject to a wide range of risks and uncertainties, and a number of factors
could cause the Company's actual results to differ materially from those
expressed in the forward-looking statements referred to above. These factors
include, among others, the uncertainties in reimbursement rates and
reimbursement coverage of various tests sold by the Company to beneficiaries of
the Medicare program (see e.g. Item 1 - Business "Reimbursement"); being deemed
to be not in compliance with Federal or state regulatory requirements (see e.g.
Item 1 - Business - "Regulatory"); the uncertainties relating to the ability of
the Company to convince physicians and/or managed care organizations to use the
Company as a provider of anatomic pathology testing services; the ability of the
Company to maintain superior quality relative to its competitors; the ability of
the Company to maintain its hospital-based business in light of the competitive
pressures and changes occurring in hospital healthcare delivery; the
uncertainties relating to states erecting barriers to the performance of
anatomic pathology testing by out-of-state laboratories; the ability of the
Company to find, attract and retain qualified management and technical
personnel; the uncertainties associated with competitive pressures from the
large national laboratories, small specialized laboratories and well established
local pathologists; and the uncertainties which would arise if integrated
delivery systems closed to outside providers emerged as the dominant form of
health care delivery.



                                       17
<PAGE>
                                    PART III



ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

         The Company's consolidated financial statements and schedule and the
reports of independent public accountants thereon appear beginning on page F-2.
See index to such consolidated financial statements and schedules and reports on
page F-1.

ITEM 9.  DISAGREEMENTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

         None

ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

         The following information with respect to the principal occupation or
employment, other affiliations and business experience of each director and
executive officer during the last five years has been furnished to the Company
by such director or executive officer. Except as indicated, each of the
directors and executive officers has had the same principal occupation for the
last five years.

INFORMATION REGARDING DIRECTORS

         Set forth below is certain information concerning each director of
Dianon Systems, Inc.

         Kevin C. Johnson, age 43, a Director since May 1996, is President and
Chief Executive Officer of the Company. Mr. Johnson joined Dianon as President
in May 1996, and was appointed to the additional position of Chief Executive
Officer in February 1997. Formerly, Mr. Johnson was with Corning Inc., a
manufacturer of specialty materials and a provider of laboratory services, for
eighteen years, serving most recently as Vice President and General Manager of
Corning Clinical Laboratories' Eastern region in Teterboro, New Jersey.

         John P. Davis, age 56, a Director since 1984, is President and Chief
Executive Officer of Infant Advantage, Inc., a child development company since
December 1997. From May 1995 through December 1997, Mr. Davis was President and
Chief Executive Officer of Calypte Biomedical Corp., a diagnostic products
company. From 1984 to January 1995, Mr. Davis was an officer of the Company. Mr.
Davis joined the Company in January 1984 as President and Chief Operating
Officer, and subsequently became co-Chief Executive Officer in 1992 and Chief
Executive Officer in 1994. In January 1995, Mr. Davis resigned as Chief
Executive Officer of the Company and became Vice Chairman of the Board. As of
February 1997, Mr. Davis was elected non-executive Chairman of the Board. Mr.
Davis also serves as Chairman of the Board of CytoLogix, Inc.

         James B. Amberson, age 46, a Director since January 1995, is Senior
Vice President and Chief Medical Officer of the Company. Dr. Amberson joined
Dianon in 1989 as Director, Cytometry Business Unit, and has served as Vice
President of Pathology Services, Vice President of Medical Affairs and Senior
Vice President and General Manager of the Anatomic Pathology Unit before his
present position. Prior to joining the Company, Dr. Amberson was Assistant
Professor of Pathology, Cornell University Medical College for six years. Dr.
Amberson holds an MD from Johns Hopkins University and an MBA from Columbia
University School of Business.

         Bruce K. Crowther, age 46, a Director since December 1997, is President
and Chief Executive Officer of Northwest Community Healthcare, Northwest
Community Hospital, In Arlington Heights, Illinois and certain of its affiliates
since January 1992. Mr. Crowther is a Fellow of the American College of
Healthcare Executives, Chairman of the Board of the Illinois Hospital and
HealthSystems Association and serves on the Board of both Chicago Hospital Risk
Pooling Program and Barrington Bank and Trust. Mr. Crowther received an M.B.A.
from Virginia Commonwealth University Medical College in Richmond, VA.

         E. Timothy Geary, age 46, a Director since June 1997, is Chairman,
President and Chief Executive Officer of National Surgery Centers, Inc. of
Chicago, Illinois, the leading independent owner and operator of ambulatory
surgery centers in the country. Prior to founding National Surgery Centers in
1987, Mr. Geary served as a Vice President with Medical Care International. Mr.
Geary is a member of the Board of Directors of the Federated Ambulatory Surgery
Association. Mr. Geary holds an MBA and BA from the University of Chicago.

                                       18
<PAGE>
         G. S. Beckwith Gilbert, age 56, a Director since October 1995, is
President, Chief Executive Officer and a Director of Field Point Capital
Management Company in Greenwich, Connecticut, a merchant banking firm. Mr.
Gilbert is also a partner of Wolsey & Co., a merchant banking firm. In addition,
Mr. Gilbert is Chairman of the Board and a Director of Megadata Corporation as
well as a Director of Davidson Hubeny Brands, Inc., Kionix, Inc. and
Transgenomic, Inc. Mr. Gilbert is a graduate of Princeton University and holds
an MBA from New York University. In February 1997, the Board elected Mr. Gilbert
Chairman of the Executive Committee.

         Jeffrey L. Sklar, age 50, a Director since 1994, is Professor of
Pathology, Harvard Medical School, and Director, Divisions of Diagnostic
Molecular Biology and of Molecular Oncology, Department of Pathology, Brigham
and Women's Hospital. Dr. Sklar has served on numerous editorial boards and has
consulted widely to the biotechnology industry. In addition, Dr. Sklar serves on
the Scientific Advisory Committee for Clinical Science, The Fred Hutchinson
Cancer Center, Seattle, Washington; the Scientific Advisory Committee, New
England Primate Research Center, Harvard University; the External Review
Committee, Dana-Farber Cancer Institute, Boston, and the Pathology B Study
Section, National Institutes of Health. Dr. Sklar also serves as a Director of
Transgenomic, Inc. and holds an MD and Ph.D. from Yale University and an MA
(honorary) from Harvard University.


COMPENSATION OF DIRECTORS

         Directors who are not employees of the Company are paid $1,500 for each
meeting of the Board of Directors attended in person and $500 for each meeting
attended by telephone, and committee members are paid $500 for each committee
meeting attended which does not occur on the same day as a Board meeting.
Directors are also reimbursed for expenses to attend meetings of the Board and
its committees. In addition, the Company has made payments to Brigham & Women's
Hospital, Inc., for which Dr. Sklar is director, Division of Diagnostic
Molecular Biology, Department of Pathology. See "Compensation Committee
Interlocks and Insider Participation."

         Commencing January 1, 1998, Mr. Davis and Mr. Gilbert, in connection
with their capacities as non-Executive Chairman of the Board and Chairman of the
Executive Committee, respectively, also receive $50,000 annually (payable
monthly at $4,166) and an annual grant of 3,000 stock options, at a price equal
to the market value on the date of grant, pursuant to the Company's 1996 Stock
Incentive Plan. They each also received a one-time grant of 13,000 stock options
in December 1997 pursuant to this same plan, in connection with their services
in the aforementioned positions during 1997.

         Pursuant to the Company's 1996 Stock Incentive Plan, Directors who are
not employees of the Company receive (i) automatic initial and quarterly grants
of stock options with tandem limited stock appreciation rights beginning July
1995, (ii) automatic quarterly grants of shares of Common Stock beginning
January 1997 and (iii) additional stock options or other awards to the extent
granted by the Board of Directors in its discretion.

         Each initial and quarterly stock option which is automatically granted
under such plan is exercisable for that number of shares obtained by dividing
$5,000 by the closing price of the Common Stock on the date of grant and is
exercisable at that price. Each such option has a 10-year term and vests with
respect to 10% of the underlying shares on the date which is three months after
the date of grant, and an additional 10% at the end of each three-month period
thereafter. Each such option can be exercised for five years following a
director's termination of service to the extent it had vested prior to
termination. Each automatic quarterly stock grant is for the number of shares
obtained by dividing $2,000 by the closing price of the Common Stock on the date
of grant, and is fully vested at grant.

         In November 1996, pursuant to authorization by the Board of Directors,
the Company granted to Dr. Sklar an option to purchase 10,000 shares of Common
Stock at an exercise price of $6.375 to compensate him for his services as a
Director. Such option vests 40% on grant, and an additional 20% on each of
August 4, 1997, August 4, 1998 and August 4, 1999. Such grant is a replacement
of an option to purchase 10,000 shares of Common Stock authorized by the Board
in 1994, but not accepted by Dr. Sklar at that time due to the conditions of his
employment by Brigham & Women's Hospital, Inc. In October 1996, pursuant to
authorization by the Board of Directors, the Company granted an option to
purchase 10,000 shares of Common Stock at an exercise price of $7.125 per share
to a director in replacement of options issued in June 1993 which had the same
exercise price, were due to expire in June 2000 and were 80% vested as of June
4, 1997 with the remaining 20% vesting on June 4, 1998. These replacement
options vested 100% in October 1996 and expire ten years from the date of grant.

                                       19
<PAGE>
         Mr. Johnson and Dr. Amberson, who are employees of the Company, receive
no additional compensation for their services as Directors of the Company.

INFORMATION REGARDING EXECUTIVE OFFICERS

         James T. Barry, age 36, has served as Vice President, Marketing and
Technology since December 1996. Mr. Barry joined the Company in July 1989 as
Corporate Recruiter and subsequently served as Director of Managed Care. Before
joining the Company, Mr. Barry was a major in the U.S. Marine Corps. Mr. Barry
holds a BA from Rhode Island College.

         Steven T. Clayton, age 31, has served as Vice President, Information
Services since he joined the Company in December 1996. Prior to joining the
Company, Mr. Clayton was with Corning Clinical Laboratories for nine years
serving most recently as the Midwest Regional Director of Information Systems.
Mr. Clayton holds an ASM from Thomas Edison State College.

         John S. Fanuko, age 38, has served as Vice President, Finance and
Corporate Controller since January 1998 when he joined the Company. Formerly,
Mr. Fanuko was Senior Vice President and Chief Financial Officer of American
Vision Centers, Inc. from June 1994 through January 1998, and prior to that, a
Senior Manager at Ernst & Young LLP. Mr. Fanuko holds an MBA from New York
University and a BS from Manhattan College and is a Certified Public Accountant.

         David R. Schreiber, age 38, has served as Senior Vice President,
Finance, Chief Financial Officer and Corporate Secretary since November 1996
when he joined the Company. Formerly, Mr. Schreiber was with Corning Clinical
Laboratories, a provider of laboratory services, for 10 years, serving most
recently as Vice President and General Manager of the laboratory's Midwest
region. Mr. Schreiber holds an MBA from Northern Illinois University.

         Martin J. Stefanelli, age 37, has served as Vice President, Laboratory
Operations since May 1997. Mr. Stefanelli joined the Company in January 1990 as
a Sales Representative and subsequently served as Logistics Manager, Marketing
Manager and Director of Operations, Anatomic Pathology. Before joining the
Company, Mr. Stefanelli was a captain in the U.S. Army. Mr. Stefanelli holds a
BS from the United States Military Academy.

         For information with respect to Mr. Johnson and Dr. Amberson, who are
also directors, see ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT
- - Information Regarding Directors.

SECTION 16(A) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

         Section 16(a) of the Securities Exchange Act of 1934 requires the
Company's directors and executive officers, and persons who own more than ten
percent of a registered class of the Company's equity securities, to file with
the Securities and Exchange Commission initial reports of ownership and reports
of changes in ownership of Common Stock and other equity securities of the
Company. Officers, directors and greater than ten percent shareholders are
required to furnish the Company with copies of all Section 16(a) forms they
file.

         To the Company's knowledge, based solely on review of the copies of
such reports furnished to the Company and representations that no other reports
were required during the fiscal year ended December 31, 1997, all Section 16(a)
reporting requirements applicable to its officers, directors and greater than
ten percent beneficial shareholders were complied with except for the following:
Mr. Stefanelli who was late in filing his initial Form 3 when becoming subject
to the Section 16 reporting requirements and Mr. Verfurth (formerly Vice
President of Sales) filed one late report with respect to one transaction.

                                       20
<PAGE>
ITEM 11. EXECUTIVE COMPENSATION

         The following table sets forth information with respect to the
following named executive officers: (i) the person who served as Chief Executive
Officer ("CEO") during 1997, (ii) the four executive officers other than the CEO
serving at December 31, 1997 whose total salary and bonus for 1997 exceeded
$100,000, and (iii) one additional executive officer who terminated employment
with the Company during 1997.

                           SUMMARY COMPENSATION TABLE

<TABLE>
<CAPTION>
                                                                                               Long Term
                                                            Annual Compensation              Compensation
                                              -----------------------------------------     --------------
                                                                             Other            Securities
        Name and                                                             Annual           Underlying         All Other
   Principal Position               Year       Salary       Bonus         Compensation          Options        Compensation
   ------------------               ----       ------       -----         ------------          -------        ------------
<S>                                <C>     <C>            <C>             <C>                  <C>            <C>
Kevin C. Johnson (1)                1997      $281,939     $82,378        $        --                --        $158,360 (3)
President, Chief Executive          1996       174,520      94,000 (2)             --           200,000           1,507
    Officer and Director

James B. Amberson, M.D.             1997       238,790      35,451                 --            20,000           2,630 (4)
Senior Vice President,              1996       200,013      47,869                 --            15,000           2,530
   Operations and Chief Medical     1995       185,465      36,997                 --            25,000           2,104
   Officer and Director

James T. Barry                      1997       118,666      20,862                 --            15,000             604 (5)
Vice President, Marketing and       1996        85,000      20,000                 --            20,000              84
    Technology                      1995        75,000      11,934                 --             5,000              84

Steven T. Clayton (6)               1997       120,000      35,568                 --            15,000          73,073 (8)
Vice President, Information         1996         6,923      14,000 (7)             --            15,000              --
    Services

David R. Schreiber (9)              1997       191,170      65,702                 --            20,000         149,167 (11)
Senior Vice President Finance,      1996        29,231      80,000 (10)            --            50,000           1,742
Chief Financial Officer and
   Corporate Secretary

Richard A. Sandberg (12)            1997       228,775          --                 --                --           5,007 (13)
Chairman of the Board               1996       212,500      20,000                 --                --           3,681
                                    1995       212,500      36,975                 --                --           3,681

</TABLE>

                                       21
<PAGE>
(1)  Mr. Johnson joined the Company as President in May 1996 and was appointed
     to the position of Chief Executive Officer in February 1997.

(2)  $50,000 of the $94,000 indicated for Mr. Johnson represents a sign-on bonus
     he received when he joined the Company in May 1996.

(3)  The $158,360 indicated for Mr. Johnson represents a stock grant of 15,000
     shares of Common Stock on January 2, 1997 at a market value of $8.50 per
     share, relocation costs, contributions paid by the Company pursuant to the
     Company's 401(K) Retirement Plan and premiums paid by the Company for term
     life insurance which for 1997 amounted to $127,500, $27,725, $1,600 and
     $1,535, respectively.

(4)  The $2,630 indicated for Dr. Amberson represents contributions paid by the
     Company pursuant to the Company's 401(K) Retirement Plan and premiums paid
     by the Company for term life insurance which for 1997 amounted to $1,600
     and $1,030, respectively.

(5)  The $604 indicated for Mr. Barry represents contributions paid by the
     Company pursuant to the Company's 401(K) Retirement Plan and premiums paid
     by the Company for term life insurance which for 1997 amounted to $520 and
     $84, respectively.

(6)  Mr. Clayton joined the Company as Vice President, Information Systems in
     December 1996.

(7)  The $14,000 indicated for Mr. Clayton represents a sign-on bonus he
     received when he joined the Company in December 1996.

(8)  The $73,073 indicated for Mr. Clayton represents relocation costs and
     premiums paid by the Company for term life insurance which for 1997
     amounted to $72,989 and $84, respectively.

(9)  Mr. Schreiber joined the Company as Senior Vice President, Finance, Chief
     Financial Officer and Corporate Secretary in November 1996.

(10) The $80,000 indicated for Mr. Schreiber represents a sign-on bonus he
     received when he joined the Company in November 1996.

(11) The $149,167 indicated for Mr. Schreiber represents a stock grant of 7,500
     shares of Common Stock on April 1, 1997 at a market value of $8.75 per
     share, relocation costs and premiums paid by the Company for term life
     insurance which for 1997 amounted to $65,625, $83,458 and $84,
     respectively.

(12) Mr. Sandberg ceased serving as Chief Executive Officer of the Company in
     May 1996, but continued to serve as an employee holding the title Chairman
     of the Board until February 1997 when he resigned as Chairman of the Board
     and as an officer of the Company. Mr. Sandberg continued to serve as a
     Director of the Company until the Company's Annual Meeting in October 1997.
     In connection with his resignation in February 1997, the Company and Mr.
     Sandberg entered into an Agreement whereby Mr. Sandberg was employed by the
     Company as a consultant to the President until February 1998, when his
     employment terminated with the Company.

(13) The $5,007 indicated for Mr. Sandberg represents contributions paid by the
     Company pursuant to the Company's 401(K) Retirement Plan and premiums paid
     by the Company for term life insurance which for 1997 amounted to $1,600
     and $3,407, respectively.

                                       22
<PAGE>
         EMPLOYMENT AND SEVERANCE AGREEMENTS

         The Company entered into an employment agreement with Mr. Johnson on
May 2, 1996. The agreement provides for Mr. Johnson to serve as President of the
Company at an initial base salary of $275,000 per annum, the grant of options to
purchase 200,000 shares of Common Stock with a 10-year term and an exercise
price of $5.69, stock grants of 15,000 shares of Common Stock on January 2, 1997
and 15,000 additional shares on January 2, 1998 provided Mr. Johnson continues
to be employed with the Company on such date, a signing bonus of $50,000 and a
loan of $150,000. The loan carries an interest rate of 5.9%, payable annually,
and is repayable upon termination of Mr. Johnson's employment with the Company.
If Mr. Johnson continues to be employed with the Company, the loan principal
will be forgiven at the rate of $2,500 per completed month of employment from
January 31, 1998 through December 31, 2002. This agreement provides that in the
event of a termination of Mr. Johnson's employment other than for "Cause," as
defined in the agreement, he is entitled to receive one year's salary and other
benefits. Subject to the foregoing, this agreement is subject to termination at
will by either party.

         The Company entered into an employment agreement with David R.
Schreiber on September 30, 1996 as the Chief Financial Officer and Senior Vice
President, Finance. The agreement provides for an initial base salary of
$190,000 per annum, the grant of options to purchase 50,000 shares of Common
Stock with a 10-year term and an exercise price of $6.625, a signing bonus of
$80,000 and a stock grant of 7,500 shares of Common Stock on April 1, 1997. This
agreement provides that in the event of a termination of Mr. Schreiber's
employment other than for "Cause," as defined in the agreement, he is entitled
to receive one year's salary (and certain other benefits) if such termination
occurs within the first year of employment or six months after the Company is
acquired by another business entity, or six month's salary (and certain other
benefits) if such termination occurs after such period. Subject to the
foregoing, this agreement is subject to termination at will by either party.

         Richard A. Sandberg resigned as Chairman of the Board and as an officer
of the Company effective February 27, 1997. In connection with his resignation,
the Company and Mr. Sandberg entered into an agreement, dated February 27, 1997
and amended on April 30, 1997, pursuant to which the Company agreed to employ
Mr. Sandberg, and Mr. Sandberg agreed to be employed, as a consultant to the
President until February 28, 1998 or his earlier death, disability, resignation,
or termination for "Cause," as defined in the agreement. Such agreement provided
for Mr. Sandberg to receive annual base compensation of $232,000 plus all
benefits provided to management employees of the Company other than
participation in management incentive programs. In addition, such agreement
provided that all options to purchase Common Stock held by Mr. Sandberg as of
February 27, 1997 became fully vested on such date to the extent not previously
vested. Mr. Sandberg also had, pursuant to his agreement, the right to sell each
such option to the Company at any time on or before May 28, 1997 for cash at a
price equal to (i) the number of shares of Common Stock covered by such option
being sold multiplied by (ii) the amount by which $10.875 exceeds the exercise
price of such option (which right was not exercised by Mr. Sandberg during such
period). The agreement was not renewed by mutual agreement of the Company and
Mr. Sandberg and was terminated by its terms on February 28, 1998, at which time
Mr. Sandberg received six-months severance in one lump sum gross payment of
$116,000. Mr. Sandberg will also receive medical insurance premiums and car
allowance during his six months severance period from February 28, 1998 through
August 31, 1998. Mr. Sandberg's stock options to purchase 20,000 shares of
Common Stock will terminate in May 1998 and options to purchase 156,000 shares
will terminate in February 2000. Mr. Sandberg has agreed that he will not
compete with the Company within the United States for a period of two years from
his termination date of February 28, 1998. The Company also loaned Mr. Sandberg
$300,000, which loan is repayable in full in two years and bears interest,
payable annually, at the rate of 9.5% per annum.

         The Company entered into an agreement with Dr. James B. Amberson on
September 1, 1996, which provide that following a "Change in Control" of the
Company, as defined in the agreement, if Dr. Amberson's employment is terminated
other than for "Cause," as defined in the agreement, he is entitled to receive
one year's salary and bonus and all his stock options will vest completely. Dr.
Amberson's agreement expires in September 2001 and is subject to successive
automatic one-year renewals thereafter (unless certain notice is given).

         The Company also entered into an employment agreement with Dr. James B.
Amberson on September 1, 1996. Pursuant to such agreement, Dr. Amberson is
entitled to a salary as determined by the Company and other employee benefits
made available by the Company to its employees. This agreement provides that in
the event of a termination of Dr. Amberson's employment for other than "Stated
Cause" (as defined in the agreement), he is entitled to receive six month's
salary and other benefits. Subject to the foregoing, this agreement is subject
to termination at will by either party.

                                       23
<PAGE>
         The Company entered into an employment agreement with Steven T. Clayton
on November 18, 1996 as Vice President, Information Services of the Company. The
agreement provides for an initial base salary of $120,000 per annum, a signing
bonus of $14,000 and the grant of options to purchase 15,000 shares of Common
Stock with a 10-year term and an exercise price of $7.875.

         During the third quarter 1997, the Company recorded a charge of
$100,250 for severance benefits relating to Mr. Verfurth, an officer of the
Company who resigned his full-time employment and officer position in September
1997. The severance agreement provided for a six-month period after his
termination and an additional three months had he not obtained other employment.
The Company made monthly payments for a six-month period after his termination
and was not required to make the additional three months of severance payments.

         During the first quarter 1998, the Company recorded a charge of $97,750
for severance benefits relating to Mr. Wells, an officer of the Company who
resigned his full-time employment and officer position in January 1998. The
Company is making monthly payments for a three-month period after his
termination and for an additional two months if he does not obtain other
employment. In addition, Mr. Wells will be paid a $15,000 bonus for the first
quarter 1998, on or before April 30, 1998, pursuant to his employment agreement.
Mr. Wells agrees to comply with the provisions of the non-competition and
confidentiality agreement.


         STOCK OPTIONS

         The following table shows, as to the named executive officers of the
Company, information about option grants in the last fiscal year. The Company,
as of December 31, 1997, has not granted any Stock Appreciation Rights to
officers.

<TABLE>
<CAPTION>
                                       INDIVIDUAL GRANTS
- ------------------------------------------------------------------------------------------------
                                                                                                    POTENTIAL REALIZABLE  
                                                                                                      VALUE AT ASSUMED    
                                        NUMBER OF         % OF TOTAL                                ANNUAL RATES OF STOCK  
                                        SECURITIES          OPTIONS                                  PRICE APPRECIATION   
                                        UNDERLYING         GRANTED TO    EXERCISE OR                  FOR OPTION TERM     
                                         OPTIONS           EMPLOYEES     BASE PRICE  EXPIRATION   ------------------------
       NAME                              GRANTED(#)         IN 1997      ($/SHARE)      DATE         5%($)       10%($)
       ----                              ----------         -------      ---------      ----         -----       ------
<S>                                   <C>                 <C>           <C>         <C>           <C>         <C>
James B. Amberson, M.D.                  20,000  (1)            7%          $8.75    12/11/2007    $110,057    $278,905
James T. Barry                           15,000  (1)            5%           8.75    12/11/2007      82,542     209,179
Steven T. Clayton                        15,000  (1)            5%           8.75    12/11/2007      82,542     209,179
Kevin C. Johnson                             --                 --             --            --          --          --
David R. Schreiber                       20,000  (1)            7%           8.75    12/11/2007     110,057     278,905
Richard A. Sandberg                          --                 --             --            --          --          --

</TABLE>

(1)      In December 1997, the Company granted certain employees and officers
         options to purchase 301,000 shares of Common Stock at $8.75 per share.
         These options vest 40% in December 1999 and 20% during each year
         thereafter. Upon termination, all unvested options are cancelled and
         all vested options expire 90 days after termination of employment.


                                       24
<PAGE>
The following table shows aggregate option exercises in the last fiscal year and
fiscal year-end option values for the named executive officers. The Company, as
of December 31, 1997, has not granted any Stock Appreciation Rights.

    AGGREGATED OPTION EXERCISES IN LAST FISCAL YEAR AND FY-END OPTION VALUES

<TABLE>
<CAPTION>
                                                VALUE        
                                               REALIZED                                             VALUE OF UNEXERCISED       
                                               (MARKET           NUMBER OF SECURITIES           IN-THE-MONEY OPTIONS AT FY-END  
                                               PRICE AT     UNDERLYING UNEXERCISED OPTIONS        (BASED ON FY-END PRICE OF     
                                               EXERCISE              AT FY-END(#)                   $9.375/SHARE) ($) (1)       
                                  SHARES         LESS                                        ---------------------------------
                                ACQUIRED ON    EXERCISE 
      NAME                       EXERCISE(#)   PRICE)($)     EXERCISABLE     UNEXERCISABLE     EXERCISABLE     UNEXERCISABLE
      ----                       -----------   ---------     -----------     -------------     -----------     -------------
<S>                            <C>            <C>           <C>             <C>               <C>               <C>
James B. Amberson, M.D.                  --    $     --          34,140           57,360         $157,484         $154,813
James T. Barry                           --          --           3,286           38,000           14,442           81,750
Steven T. Clayton                        --          --              --           30,000               --           31,875
Kevin C. Johnson                         --          --              --          200,000               --          737,500
David R. Schreiber                       --          --              --           70,000               --          150,000
Richard A. Sandberg(2)                   --          --         156,000               --          171,600               --

</TABLE>

(1)  Computed based upon difference between aggregate fair market value and
     aggregate exercise price.

(2)  Mr. Sandberg resigned as Chairman of the Board and as an officer of the
     Company effective February 27, 1997. In connection with his resignation,
     the Company and Mr. Sandberg entered into an agreement that provided that
     all options to purchase Common Stock held by Mr. Sandberg as of February
     27, 1997 became fully vested on such date to the extent not previously
     vested (which resulted in options to purchase 26,976 shares of Common Stock
     becoming fully vested on such date). See "Executive Compensation -
     Employment and Severance Agreements."


           COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

         Dr. Sklar served as a member of the Compensation Committee of the
Company's Board of Directors during the last completed fiscal year and is
continuing to serve as such in the 1998 fiscal year. In 1995 the Company entered
into a three-year research and development agreement with Brigham & Women's
Hospital, Inc., for which Dr. Sklar is director, Division of Diagnostic
Molecular Biology, Department of Pathology. The agreement required the Company
to make quarterly payments of $30,000 in exchange for an option to obtain rights
in certain existing inventions as well as inventions developed during the course
of the research in the areas of cancer detection and diagnosis. The research was
to be conducted by Dr. Sklar. The Company paid $60,000, $120,000 and $60,000
under this agreement in 1997, 1996 and 1995, respectively. The Company
terminated this agreement effective as of June 30, 1997 and has made all
required payments as of December 31, 1997. In addition, the Company has made
payments to Brigham & Women's Hospital, Inc. of $30,000 in each of 1996 and 1995
for consulting services.




                                       25
<PAGE>
ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

OWNERSHIP OF VOTING STOCK BY MANAGEMENT

          The following table gives information concerning the beneficial
ownership of the Company's Common Stock as of March 16, 1998 by each director
and each of the executive officers named in the summary compensation table and
all current directors and executive officers (as of March 16, 1998) as a group.

<TABLE>
<CAPTION>
                                                Total Shares
                                                Beneficially        Direct         Right to       Percent of
Beneficial Owners                                Owned(1)(2)      Ownership       Acquire(3)       Class(4)
- -----------------                                -----------      ---------       ----------       --------
<S>                                             <C>               <C>             <C>              <C>
James B. Amberson, M.D.                             73,827          25,172           37,858            1%
James T. Barry                                       5,295           2,009            3,286            --  (5)
Steven T. Clayton                                       --              --               --            --  (5)
Bruce K. Crowther                                      314             205              109            --  (5)
John P. Davis                                      239,123         117,334          121,789            4%
Timothy E. Geary                                     1,141             651              490            --  (5)
G.S. Beckwith Gilbert                            1,805,900       1,801,114            4,786           27%  (6)
Kevin C. Johnson                                   121,170          30,373           80,000            2%
Richard A. Sandberg                                172,845           7,325          165,520            3%
David R. Schreiber                                  18,297           7,500               --            --  (5)
Jeffrey L. Sklar                                    12,819           1,114           11,705            --  (5)

All current directors and executive  officers
   as a group (12 persons)                       2,256,750       1,985,472          260,481           33%

</TABLE>

(1)    The information as to beneficial ownership is based on statements
       furnished to the Company by its executive officers and directors. Each
       executive officer and director has sole voting and sole investment power
       with respect to his respective shares listed above, except that the
       shares reported for Mr. Gilbert include 121,951 shares which are held by
       a trust of which Mr. Gilbert is a trustee, as to which Mr. Gilbert shares
       voting and investment powers. Amounts shown for each of Messrs. Johnson
       and Schreiber and Dr. Amberson include 10,797 shares held in the
       Company's 401(K) Retirement Plan, as to which such officers share voting
       power as trustees of such plan and each individual plan participant has
       investment power, subject to the terms of such plan, of the shares in his
       account; such amount includes 373 and 4,955 shares in Mr.
       Johnson's and Mr. Sandberg's  account, respectively.
(2)    Includes shares listed under the captions "Direct Ownership" and "Right
       to Acquire," as well as shares held in the Company's 401(K) Retirement
       Plan which are beneficially owned by the named individuals as trustees of
       such plan but as to which such trustees have no economic interest.
(3)    Individuals have the right to acquire these shares within 60 days of
       March 16, 1998 by the exercise of stock options or through purchases
       under the Company's Employee Stock Purchase Plan.
(4)    For the purposes of this table, "Percent of Class" held by each
       individual has been calculated based on a total class equal to the sum of
       (i) 6,616,883 shares of Common Stock issued and outstanding on March 16,
       1998 plus (ii) for such individual the number of shares of Common Stock
       subject to stock options presently exercisable, or exercisable within 60
       days after March 16, 1998, held by that individual, and which percent is
       rounded to the nearest whole number.
(5)    Owns less than 1% of the outstanding Common Stock.
(6)    As of March 16, 1998, Mr. Gilbert cannot vote, without restriction, any
       Common Stock or other voting securities of the Company beneficially owned
       by him representing greater than 20% of the total voting power of the
       Company's voting securities outstanding from time to time, or 1,323,377
       votes as of March 16, 1998. Excess votes above this amount are required
       to be voted in proportion to the votes cast by all other shareholders of
       the Company.

                                       26
<PAGE>
OWNERSHIP OF VOTING STOCK BY CERTAIN BENEFICIAL OWNERS

         The following table sets forth information with respect to the only
persons who, to the best knowledge of the Company as derived from Schedules 13F,
13D and 13G filed by such persons, beneficially owned more than five percent of
the Common Stock of the Company as of March 16, 1998. Unless otherwise indicated
below, each person included in the table has sole voting and investment power
with respect to all shares included therein.

<TABLE>
<CAPTION>
                                                               Amount and Nature
                        Name and Address of                      of Beneficial        Percent
Title of Class           Beneficial Owner                          Ownership          of Class(1)
- --------------           ----------------                          ---------          -----------
<S>                 <C>                                        <C>                    <C> 
Common Stock         G. S. Beckwith Gilbert et al                  1,805,900  (2)(3)    27%   (3)
                     104 Field Point Road
                     Greenwich, CT 06830

Common Stock         Oracle Management Partners, Inc.                471,328            7%
                     and Affiliates
                     712 E 5th Avenue - 45th Floor
                     New York, NY  10019


Common Stock         John M. Bryan et al                             356,412            5%
                     Bryan and Edwards
                     600 Montgomery Street - 35th Floor
                     San Francisco, CA  94111
</TABLE>

(1)    For the purposes of this table, "Percent of Class" held by each person
       has been calculated based on a total class equal to the sum of (i)
       6,616,883 shares of Common Stock issued and outstanding on March 16, 1998
       plus (ii) for such person the number of shares of Common Stock subject to
       stock options or warrants presently exercisable, or exercisable within 60
       days after March 16, 1998, held by that person, and which percent is
       rounded to the nearest whole number.
(2)    Mr.  Gilbert has shared voting and investment  power with respect to 
       121,951 shares  included in the table above.
(3)    As of March 16, 1998, Mr. Gilbert cannot vote, without restriction, any
       Common Stock or other voting securities of the Company beneficially owned
       by him representing greater than 20% of the total voting power of the
       Company's voting securities outstanding from time to time, or 1,323,377
       votes as of March 16, 1998. Excess votes above this amount are required
       to be voted in proportion to the votes cast by all other shareholders of
       the Company.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

         See Item 11 - Executive Compensation - "Compensation Committee
Interlocks and Insider Participation" and Notes 6 and 13 of the Company's
consolidated financial statements included herewith.

         Pursuant to his employment agreement, the President of the Company
received a loan in 1996 totaling $150,000 which bears interest at 5.9%, payable
annually, and is repayable upon termination of his employment with the Company.
In addition, the loan principal will be forgiven at a rate of $2,500 per month
over the period January 1998 through December 2002 if the President continues to
be employed by the Company.

                                       27
<PAGE>
                                     PART IV



ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

(a)      Financial Statements, Financial Statement Schedules Filed.

          1)   Financial Statements - See accompanying Consolidated Financial
               Statements and Schedules, Pages F-1 through F-18.

          2)   Financial Statement Schedules - See accompanying Consolidated
               Financial Statements and Schedules, Pages F-1 through F-18.

          3)   Exhibits - Refer to 14(c) below.

(b)      The Company filed no reports on Form 8-K in the fourth quarter of 1997
         with the Securities and Exchange Commission.

(c)      Exhibit Index


3.1      Restated Certificate of Incorporation of the Company, as amended
         through June 12, 1991 (incorporated by reference to Exhibit 3.1 of the
         Registrant's Registration Statement No. 33-41226).

3.2      Restated By-Laws of the Company, as amended through October 24, 1996
         (incorporated by reference to Exhibit 4.2 of the Registrant's
         Registration Statement No. 333-18817).

3.3      Restated By-Laws of the Company, as amended through February 2, 1997
         (incorporated by reference to Exhibit 4.2 of the Registrant's
         Registration Statement No. 333-18817).

10.1     Consulting Agreement, dated August 4, 1989, between DIANON Systems,
         Inc. and Nonda Katopodis (incorporated by reference to Exhibit 10.7 of
         the Registrant's Registration Statement No. 33-41226).**

10.2     Executive Vesting Agreement, dated as of June 11, 1991, between DIANON
         Systems, Inc. and James B. Amberson (incorporated by reference to
         Exhibit 10.13 of the Registrant's Registration Statement No.
         33-41226).**

10.3     1991 Stock Incentive Plan (incorporated by reference to Exhibit 10.17
         of the Registrant's Registration Statement No. 33-41226).**

10.4     Management Incentive Plan (incorporated by reference to Exhibit 10.18
         of the Registrant's Registration Statement No. 33-41226).**

10.5     Stock Option Grant to Walter O. Fredericks, dated April 27, 1990
         (incorporated by reference to Exhibit 10.23 of the Registrant's
         Registration Statement No. 33-41226).**

10.6     Stock Option Grant to Richard A. Sandberg, dated June 12, 1991
         (incorporated by reference to Exhibit 10.24 of the Registrant's
         Registration Statement No. 33-41226).**

10.7     Stock Option Grant to Richard A. Sandberg, dated June 12, 1991
         (incorporated by reference to Exhibit 10.25 of the Registrant's
         Registration Statement No. 33-41226).**

10.8     Lease Agreement, made as of February 14, 1989, between Watson Boulevard
         Development Limited Partnership, as lessor, and DIANON Systems, Inc.,
         as lessee, for premises located at 200 Watson Boulevard (incorporated
         by reference to Exhibit 10.29 of the Registrant's Registration
         Statement No. 33-41226).

10.9     License Agreement, dated June 9, 1983, between Sloan-Kettering
         Institute for Cancer Research and N-K Laboratories Limited Partnership
         (incorporated by reference to Exhibit 10.30 of the Registrant's
         Registration Statement No. 33-41226).

10.10    License Agreement, dated July 29, 1987, between University of Rochester
         and DIANON Systems, Inc. (incorporated by reference to Exhibit 10.32 of
         the Registrant's Registration Statement No. 33-41226).

10.11    Development Agreement, effective September 25, 1987, between
         Connecticut Product Development Corporation and DIANON Systems, Inc.
         (incorporated by reference to Exhibit 10.33 of the Registrant's
         Registration Statement No. 33-41226).


                                       28
<PAGE>
Exhibit Index (continued)

10.12    Stock Option Grant to James B. Amberson, dated April 23, 1991
         (incorporated by reference to Exhibit 28.1 to the Registrant's
         Quarterly Report on Form 10-Q for the quarter ended September 30,
         1991).**

10.13    Stock Option Grant to Richard A. Sandberg, dated June 12, 1991, as
         amended (incorporated by reference to Exhibit 10.37 to the Registrant's
         Annual Report on Form 10-K for the year ended December 31, 1991).**

10.14    Asset Purchase Agreement, dated April 30, 1993, by and among the
         Registrant and Molecular Oncology, Inc., and Oncologix, Inc.
         (incorporated by reference to Exhibit 1.1 to the Registrant's Form 8-K
         dated April 30, 1993, filed with the Securities and Exchange Commission
         on May 14, 1993).

10.15    Asset Purchase Agreement, dated June 29, 1993, by and among the
         Registrant and Collaborative Research, Inc. (incorporated by reference
         to Exhibit 1.2 to the Registrant's Form 8-K dated June 29, 1993, filed
         with the Securities and Exchange Commission on July 13, 1993).

10.16    Term Loan Agreement, dated July 14, 1993, by and among the Registrant
         and the Union Trust Company (incorporated by reference to Exhibit 10.34
         to the Registrant's Annual Report on Form 10-K/A Amendment 1 for the
         year ended December 31, 1993, filed with the Securities and Exchange
         Commission on April 28, 1994).

10.17    Rights Agreement, dated April 29, 1994, by and among the Registrant and
         American Stock and Trust Company, as Rights Agent (incorporated by
         reference to Exhibit 1 to the Registrant's Form 8-K dated April 29,
         1994, filed with the Securities and Exchange Commission on May 9,
         1994).

10.18    Severance Agreement, dated January 20, 1995, by and among the
         Registrant and John P. Davis (incorporated by reference to Exhibit
         10.36 to the Registrant's Annual Report on Form 10-K for the year ended
         December 31, 1995, filed with the Securities and Exchange Commission on
         March 29, 1996).**

10.19    Employment Agreement, dated May 3, 1996, by the Registrant and Kevin C.
         Johnson (incorporated by reference to Exhibit 10.37 to the Registrant's
         Quarterly Report on Form 10-Q for the quarter ended June 30, 1996).**

10.20    Executive Employment Agreement, dated September 1, 1996, by the
         Registrant and Richard A. Sandberg (incorporated by reference to
         Exhibit 10.38 to the Registrant's Quarterly Report on Form 10-Q for the
         quarter ended September 30, 1996).**

10.21    Employment Agreement, dated September 1, 1996, by the Registrant and
         Dr. James B. Amberson (incorporated by reference to Exhibit 10.39 to
         the Registrant's Quarterly Report on Form 10-Q for the quarter ended
         September 30, 1996).**

10.22    Executive Employment Agreement, dated September 1, 1996, by the
         Registrant and Dr. James B. Amberson (incorporated by reference to
         Exhibit 10.40 to the Registrant's Quarterly Report on Form 10-Q for the
         quarter ended September 30, 1996).**

10.23    Severance Agreement, dated September 27, 1996, by the Registrant and
         Carl R. Iberger (incorporated by reference to Exhibit 10.41 to the
         Registrant's Quarterly Report on Form 10-Q for the quarter ended
         September 30, 1996).**

10.24    Employment Agreement, dated September 30,1996, by the Registrant and
         David R. Schreiber (incorporated by reference to Exhibit 10.42 to the
         Registrant's Quarterly Report on Form 10-Q for the quarter ended
         September 30, 1996).**

10.25    Employment Agreement, dated November 18, 1996, by the registrant and
         Steven T. Clayton.**

10.26    Severance Agreement dated November 18, 1996, by the registrant and
         Daniel J. Cronin, III.**

10.27    Amendment dated as of October 4, 1995 to Rights Agreement dated as of
         April 29, 1994 between the Registrant and American Stock Transfer and
         Trust Company, as Rights Agent (incorporated by reference to Exhibit
         No. 1 to the Registrant's Form 8-K dated October 30, 1996 filed with
         the Securities and Exchange Commission on November 8, 1995).

10.28    1996 Stock Incentive Plan (incorporated by reference to Appendix A to
         the Registrant's Statement on Schedule 14A filed with the Securities
         and Exchange Commission on September 23, 1996).**

10.29    Stock and Warrant Purchase Agreement, dated as of October 4, 1995,
         among the Gilbert Family Trust, the G.S. Beckwith Gilbert I.R.A.
         Contributory Account, G.S. Beckwith Gilbert and the Registrant.

10.30    Registration Rights Agreement, dated as of October 4, 1995, among the
         Gilbert Family Trust, the G.S. Beckwith Gilbert I.R.A. Contributory
         Account, G.S. Beckwith Gilbert and the Registrant.

10.31    Warrant No. 1, dated as of October 4, 1995, by the Registrant in favor
         of G.S. Beckwith.

10.32    Promissory Note, dated October 4, 1995, by G.S. Beckwith Gilbert in
         favor of the Registrant.

10.33    Stock Option Grant dated October 24, 1996 by the Registrant to Andre de
         Bruin.**


                                       29
<PAGE>
Exhibit Index (continued)

10.34    Stock Option Grant dated November 4, 1996 by the Registrant to Jeffrey
         M. Sklar, M.D.**

10.35    Loan Agreement dated December 3, 1996 by the Registrant to Kevin C.
         Johnson).**

10.36    Form of standard Stock Option Grant for outside directors.**

10.37    Amendment to Warrant Certificate No. W-1 dated as of October 2, 1996
         between the Registrant and G.S. Beckwith Gilbert.

10.38    Severance Agreement dated February 27, 1997 by the Registrant and
         Richard A. Sandberg.**

10.39    Amendment dated April 30, 1997 by the Registrant and Richard A.
         Sandberg.**

10.40    Security Agreement dated April 30, 1997 by the Registrant and Richard
         A. Sandberg.**

10.41    Secured Promissory Note dated April 30, 1997 by the Registrant and
         Richard A. Sandberg.**

10.42    Non-Compete Agreement dated September 3, 1997 by the Registrant and
         Vernon L. Wells.**

10.43    Severance Agreement dated September 15, 1997 by the Registrant and
         Robert C. Verfurth.**

10.44    Consulting and Proprietary Information and Inventions Agreement dated
         October 1, 1997 by the Registrant and Dr. Jeffrey L. Sklar, MD, PhD
         (filed herewith).

10.45    Severance Agreement dated January 27, 1998 by the Registrant and Vernon
         L. Wells (filed herewith).**

11.1     Statement re: computation of per share earnings. *

22.1     List of Subsidiaries of the Company (incorporated by reference to
         Exhibit 22.1 of the Registrant's Registration Statement No. 33-41226).

23.1     1996 Consent of Arthur Andersen LLP (incorporated by reference to
         Exhibit 23.1 of the Registrant's Annual Report on Form 10-K for the
         year ended December 31, 1995).

23.2     1997 Consent of Arthur Andersen LLP (incorporated by reference to
         Exhibit 23.2 of the Registrant's Annual Report on Form 10-K for the
         year ended December 31, 1996).

23.3     1998 Consent of Arthur Andersen LLP (filed herewith).

27.1     Financial Data Schedule.

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

         *        Not applicable or contained elsewhere herein.
         **       A management contract or compensatory plan or arrangement
                  required to be filed as an exhibit to this form pursuant to
                  Item 14(c) of this report.



                                       30
<PAGE>
                                   SIGNATURES


         Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Registrant has caused this report to be signed on its
behalf by the undersigned, thereunto duly authorized.

DATED:    March 27, 1998
                                     DIANON SYSTEMS, INC.

                                     By: /s/ KEVIN C. JOHNSON
                                         -------------------------------------
                                         Kevin C. Johnson,
                                         President and Chief Executive Officer


     Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed below by the following persons on behalf of the
Registrant and in the capacities and on the dates indicated:


Signature                              Capacity                        Date
- ---------                              --------                        ----

/s/ KEVIN C. JOHNSON            President and Chief Executive     March 27, 1998
- -----------------------------   Officer and a Director
Kevin C. Johnson                (Principal Executive Officer)
                                

/s/ DAVID R. SCHREIBER          Senior Vice President, Finance    March 27, 1998
- -----------------------------   and Chief Financial Officer
David R. Schreiber              (Principal Financial Officer)
                                

/s/ JOHN S. FANUKO              Vice President, Finance and       March 27, 1998
- -----------------------------   Corporate Controller
John S. Fanuko                  (Principal Accounting Officer)
                                

/s/ JOHN P. DAVIS               Chairman of the Board             March 27, 1998
- -----------------------------
John P. Davis


/s/ G. S. BECKWITH GILBERT      Director and Chairman of the      March 27, 1998
- -----------------------------   Executive Committee
G. S. Beckwith Gilbert          
                                

/s/ JAMES B. AMBERSON, MD       Director, Chief Medical           March 27, 1998
- -----------------------------   Officer and Senior Vice
James B. Amberson, M.D.         President
                                

/s/ BRUCE K. CROWTHER           Director                          March 27, 1998
- -----------------------------
Bruce K. Crowther


/s/ E. TIMOTHY GEARY            Director                          March 27, 1998
- -----------------------------
E. Timothy Geary


/s/ JEFFREY L. SKLAR, MD PhD    Director                          March 27, 1998
- -----------------------------
Jeffrey L. Sklar, M.D., Ph.D. 


                                       31

<PAGE>
                              DIANON SYSTEMS, INC.
            INDEX TO CONSOLIDATED FINANCIAL STATEMENTS AND SCHEDULES


                                                                    Page
                                                                    ----

Report of Independent Public Accountants                            F-2

Consolidated Balance Sheets as of December 31, 1997 and 1996        F-3 & F-4

Consolidated Statements of Operations for the Years Ended
December 31, 1997, 1996 and 1995                                    F-5

Consolidated Statements of Stockholders' Equity for the
Years Ended December 31, 1997, 1996 and 1995                        F-6

Consolidated Statements of Cash Flows for the Years Ended
December 31, 1997, 1996 and 1995                                    F-7 & F-8

Notes to Consolidated Financial Statements                          F-9 to F-16


Schedules:

Report of Independent Public Accountants                            F-17

Schedule II - Valuation and Qualifying Accounts                     F-18



         All other schedules required by Regulation S-X have been omitted
because they are not applicable or because the required information is included
in the consolidated financial statements or notes thereto.


                                       F-1
<PAGE>
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS


To DIANON Systems, Inc.:

         We have audited the accompanying consolidated balance sheets of DIANON
Systems, Inc. (a Delaware corporation) and subsidiaries as of December 31, 1997
and 1996, and the related consolidated statements of operations, stockholders'
equity and cash flows for each of the three years in the period ended December
31, 1997. These financial statements are the responsibility of the Company's
management. Our responsibility is to express an opinion on these financial
statements based on our audits.

         We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

         In our opinion, the financial statements referred to above present
fairly, in all material respects, the financial position of DIANON Systems, Inc.
and subsidiaries as of December 31, 1997 and 1996 and the results of their
operations and their cash flows for each of the three years in the period ended
December 31, 1997 in conformity with generally accepted accounting principles.


                                              ARTHUR ANDERSEN LLP


Stamford, Connecticut,
February 18, 1998


                                       F-2
<PAGE>
                              DIANON SYSTEMS, INC.
                        CONSOLIDATED BALANCE SHEETS AS OF
                           DECEMBER 31, 1997 AND 1996

<TABLE>
<CAPTION>
                                                                                  1997            1996
                                                                             ---------------- --------------
<S>                                                                         <C>               <C>
      ASSETS

CURRENT ASSETS:
     Cash and cash equivalents                                                  $12,401,062    $ 7,488,590
     Accounts receivable, net of allowances of $1,292,095 and
         $1,056,920, at December 31, 1997 and 1996, respectively                  14,444,767    15,426,221
     Prepaid expenses and employee advances                                          529,887     1,189,139
     Prepaid and refundable income taxes                                                  --       329,371
     Inventory                                                                       729,658       662,567
     Deferred income taxes                                                         1,016,797       677,277
                                                                             ---------------- --------------
           Total current assets                                                   29,122,171    25,773,165
                                                                             ---------------- --------------

PROPERTY AND EQUIPMENT, at cost
     Laboratory and office equipment                                             8,489,323      12,233,989
     Leasehold improvements                                                      3,676,200       3,612,198
       Less - accumulated depreciation and amortization                          (6,057,511)    (8,606,176)
                                                                             ---------------- --------------
                                                                                 6,108,012       7,240,011
                                                                             ---------------- --------------

INTANGIBLE ASSETS, net of accumulated amortization of $3,207,570 and
     $2,991,286, at December 31, 1997 and 1996, respectively                        388,030        604,313

DEFERRED INCOME TAXES                                                               670,191        458,465

OTHER ASSETS                                                                        600,657        459,696
                                                                             ================ ==============
         TOTAL ASSETS                                                           $36,889,061    $34,535,650
                                                                             ================ ==============
</TABLE>
                     The accompanying notes to consolidated
                    financial statements are an integral part
                            of these balance sheets.

                                       F-3
<PAGE>
                              DIANON SYSTEMS, INC.
                        CONSOLIDATED BALANCE SHEETS AS OF
                     DECEMBER 31, 1997 AND 1996 (CONTINUED)

<TABLE>
<CAPTION>
                                                                                  1997            1996
                                                                             --------------- ---------------
<S>                                                                          <C>             <C>
         LIABILITIES AND STOCKHOLDERS' EQUITY

CURRENT LIABILITIES:
     Accounts payable                                                          $ 1,540,922     $ 2,123,661
     Accrued employee compensation                                               1,631,180       1,504,430
     Accrued employee stock purchase plan                                          549,619         549,540
     Accrued income taxes payable                                                  747,564              --
     Current portion of capitalized lease obligations                               41,470          26,107
     Current portion of note payable                                                    --         650,154
     Other accrued expenses                                                      3,224,613       2,861,268
                                                                             --------------- ---------------
           Total current liabilities                                             7,735,368       7,715,160
                                                                             --------------- ---------------

LONG-TERM PORTION OF CAPITALIZED LEASE OBLIGATIONS                                 107,449          69,611

DEFERRED INCOME TAXES                                                                   --         201,951
                                                                             --------------- ---------------
           Total liabilities                                                     7,842,817       7,986,722
                                                                             --------------- ---------------

STOCKHOLDERS' EQUITY:
     Common stock, par value $.01 per share, 20,000,000 shares authorized,
         6,791,320 and 6,712,774 shares issued and
         outstanding at December 31, 1997 and 1996, respectively                    67,914          67,128
     Additional paid-in capital                                                 27,880,223      27,965,560
     Retained earnings (deficit)                                                 2,743,380        (554,317)
     Common stock held in treasury, at cost - 197,617 and 117,196
         shares at December 31, 1997 and 1996, respectively                     (1,645,273)       (929,443)
                                                                             --------------- ---------------
         Total stockholders' equity                                             29,046,244      26,548,928
                                                                             --------------- ---------------
         TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY                            $36,889,061     $34,535,650
                                                                             =============== ===============

</TABLE>
                     The accompanying notes to consolidated
                    financial statements are an integral part
                            of these balance sheets.

                                       F-4
<PAGE>
                              DIANON SYSTEMS, INC.
                      CONSOLIDATED STATEMENTS OF OPERATIONS
              FOR THE YEARS ENDED DECEMBER 31, 1997, 1996 AND 1995

<TABLE>
<CAPTION>
                                                                  1997            1996            1995
                                                             --------------- --------------- ---------------
<S>                                                          <C>             <C>            <C>
NET REVENUES                                                   $60,887,193     $55,998,995     $45,700,321

COST OF SALES                                                   31,121,507      26,897,576      20,390,742
                                                             --------------- --------------- ---------------

         GROSS PROFIT                                           29,765,686      29,101,419      25,309,579

SELLING, GENERAL, AND ADMINISTRATIVE
         EXPENSES                                               22,912,147      22,443,192      19,619,773

RESEARCH AND DEVELOPMENT EXPENSES                                1,665,735       3,157,846       5,255,032
                                                             --------------- --------------- ---------------

         INCOME FROM OPERATIONS                                  5,187,804       3,500,381         434,774

INTEREST INCOME, NET                                               522,427         306,840         181,240

                                                             --------------- --------------- ---------------
         INCOME BEFORE PROVISION FOR INCOME TAXES                5,710,231       3,807,221         616,014

PROVISION FOR INCOME TAXES                                       2,412,534       1,637,105         508,918
                                                             --------------- --------------- ---------------

         NET INCOME                                            $ 3,297,697     $ 2,170,116      $  107,096
                                                             =============== =============== ===============

         EARNINGS PER SHARE:
              BASIC                                            $       .51     $       .35      $      .02
              DILUTED                                          $       .48     $       .35      $      .02
                                                              

         WEIGHTED AVERAGE SHARES OUTSTANDING:
              BASIC                                               6,430,060       6,151,061       5,542,402
              DILUTED                                             6,808,250       6,287,159       5,549,280

</TABLE>
                     The accompanying notes to consolidated
                      financial statements are an integral
                            part of these statements.

                                       F-5
<PAGE>
                              DIANON SYSTEMS, INC.
                 CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
              FOR THE YEARS ENDED DECEMBER 31, 1997, 1996, AND 1995

<TABLE>
<CAPTION>
                                                                                                          Foreign   
                                                              Additional     Retained     Unrealized     Currency   
                                           Common Stock         Paid-In      Earnings      Holdings     Translation 
                                        Shares       Amount     Capital     (Deficit)    Gains/(Losses) Adjustment  
                                     -------------------------------------------------------------------------------
<S>                                  <C>           <C>       <C>           <C>           <C>            <C>         
BALANCE, December 31, 1994            5,296,879     $52,969  $21,591,942   ($2,831,529)      ($90,383)   ($58,938)  
    Stock options exercised              14,572         146       59,286            --             --          --   
    Issuance of common stock and
     warrants, net of issuance costs  1,000,000      10,000    4,976,443            --             --          --   

    Common stock acquired for treasury       --          --           --            --             --          --   
    Shareholder note receivable              --          --           --            --             --          --   
    Stock compensation expense -
     stock options                           --          --      (18,014)           --             --          --   
    Write-off of unrealized holding
     losses                                  --          --           --            --         90,383          --   
    Write-off of foreign currency
     translation adjustment                  --          --           --            --             --      58,938   
    Net income                               --          --           --       107,096             --          --   
                                     -------------------------------------------------------------------------------
BALANCE, December 31, 1995            6,311,451      63,115   26,609,657    (2,724,433)            --          --   
    Stock options exercised              23,621         236      107,476            --             --          --   
    Exercise of warrants, net of
     exercise costs                     377,702       3,777    1,536,540            --             --          --   
    Common stock acquired for treasury       --          --           --            --             --          --   
    Extinguishment of shareholder
     note receivable                         --          --     (296,000)           --             --          --   
    Stock compensation expense -
     stock options                           --          --        7,887            --             --          --   
    Net income                               --          --           --     2,170,116             --          --   
                                     -------------------------------------------------------------------------------
BALANCE, December 31, 1996            6,712,774      67,128   27,965,560     ( 554,317)                             
    Stock options exercised              51,764         518      248,498            --             --          --   
    Employee stock purchase plan             --          --     (564,822)           --             --          --   
    Stock grants                         26,782         268      230,987            --             --          --   
    Common stock acquired for treasury       --          --           --            --             --          --   
    Net income                               --          --           --     3,297,697             --          --   
                                     -------------------------------------------------------------------------------
BALANCE, December 31, 1997            6,791,320     $67,914  $27,880,223    $2,743,380    $        --    $     --   
                                     ===============================================================================
</TABLE>

[TABLE CONTINUED ON THE FOLLOWING PAGE F-6B]

                     The accompanying notes to consolidated
                      financial statements are an integral
                            part of these statements.


                                      F-6A
<PAGE>
[TABLE CONTINUED FROM PAGE F-6A]

<TABLE>
<CAPTION>
                                           Common Stock        Shareholder
                                       Acquired for Treasury   Note
                                         Shares     Amount     Receivable      Total
                                     ---------------------------------------------------
<S>                                   <C>        <C>           <C>         <C>
BALANCE, December 31, 1994                   --   $      --   $       --    $18,664,061
    Stock options exercised                  --          --           --         59,432
    Issuance of common stock and
     warrants, net of issuance costs         --          --           --      4,986,443

    Common stock acquired for treasury  (50,000)    (200,000)         --       (200,000)
    Shareholder note receivable              --          --     (296,000)      (296,000)
    Stock compensation expense -
     stock options                           --          --           --        (18,014)
    Write-off of unrealized holding
     losses                                  --          --           --         90,383
    Write-off of foreign currency
     translation adjustment                  --          --           --         58,938
    Net income                               --          --           --        107,096
                                     ---------------------------------------------------
BALANCE, December 31, 1995              (50,000)    (200,000)   (296,000)    23,452,339
    Stock options exercised                  --          --           --        107,712
    Exercise of warrants, net of
     exercise costs                     422,298    2,478,889          --      4,019,206
    Common stock acquired for treasury (489,494)  (3,208,332)         --     (3,208,332)
    Extinguishment of shareholder
     note receivable                         --          --      296,000             --
    Stock compensation expense -
     stock options                           --          --           --          7,887
    Net income                               --          --           --      2,170,116
                                     ---------------------------------------------------
BALANCE, December 31, 1996             (117,196)   (929,443)          --     26,548,928
    Stock options exercised                  --          --           --        249,016
    Employee stock purchase plan        146,579    1,220,200          --        655,378
    Stock grants                             --          --           --        231,255
    Common stock acquired for treasury (227,000)  (1,936,030)         --     (1,936,030)
    Net income                               --          --           --      3,297,697
                                     ---------------------------------------------------
BALANCE, December 31, 1997             (197,617)  ($1,645,273)  $     --    $29,046,244
                                     ===================================================

</TABLE>
                     The accompanying notes to consolidated
                      financial statements are an integral
                            part of these statements.


                                      F-6B
<PAGE>
                              DIANON SYSTEMS, INC.
                      CONSOLIDATED STATEMENTS OF CASH FLOWS
              FOR THE YEARS ENDED DECEMBER 31, 1997, 1996 AND 1995
<TABLE>
<CAPTION>
                                                                   1997            1996            1995
                                                              --------------- --------------- ---------------
<S>                                                           <C>             <C>             <C>
CASH FLOWS FROM OPERATING ACTIVITIES:

    Net income                                                   $3,297,697      $2,170,116     $   107,096
Adjustments to reconcile net income to net cash provided
    by (used in) operations -
    Non-cash charges
      Depreciation and amortization                               3,109,515       2,463,325       2,758,611
      Stock compensation expense                                    231,255           7,887         (18,014)
      Loss on disposal of fixed assets                               55,241          27,240          56,266
      Investment write-down                                              --          61,846         529,625
      Deferred tax provision                                       (753,197)       (168,539)        (97,211)
Changes in other current assets and liabilities
    Decrease (increase) in accounts receivable                      981,454      (5,772,250)      1,345,427
    Decrease (increase) in prepaid expenses and
      employee advances                                             988,623        (278,127)       (147,728)
    (Increase) decrease in inventory                                (67,091)       (108,169)        158,643
    (Increase) in other assets                                     (160,853)       (320,176)        (29,075)
    Increase in accounts payable and other accrued
      liabilities                                                   646,762       1,740,665       1,424,496
                                                              --------------- --------------- ---------------
      Net cash provided by (used in) operating activities         8,329,406        (176,182)      6,088,136
                                                              --------------- --------------- ---------------

CASH FLOWS FROM INVESTING ACTIVITIES:

    Capital expenditures                                         (1,860,646)     (3,431,895)     (2,290,720)
    Proceeds from the sale of stock held for investment               9,064          73,661          14,867
    Proceeds from the sale of fixed assets                            7,060           7,500          10,040
                                                              --------------- --------------- ---------------
      Net cash (used in) investing activities                    (1,844,522)     (3,350,734)     (2,265,813)
                                                              --------------- --------------- ---------------
</TABLE>
                     The accompanying notes to consolidated
                      financial statements are an integral
                            part of these statements.


                                       F-7
<PAGE>
                              DIANON SYSTEMS, INC.
                      CONSOLIDATED STATEMENTS OF CASH FLOWS
        FOR THE YEARS ENDED DECEMBER 31, 1997, 1996 AND 1995 (CONTINUED)

<TABLE>
<CAPTION>
                                                                   1997            1996            1995
                                                              --------------- --------------- ---------------
<S>                                                           <C>             <C>             <C>
CASH FLOWS FROM FINANCING ACTIVITIES:

    Repayments of note payable                                 $   (650,154)   $   (916,150)  $   (862,446)
    Net borrowings (repayments) of capitalized lease
      obligations                                                   109,378          22,839        (53,614)
    Net proceeds from issuance of common stock
      and warrants                                                       --              --       4,690,443
    Net proceeds from exercise of warrants                               --       4,019,206              --
    Purchase of common stock held in treasury                    (1,936,030)     (3,208,332)       (200,000)
    Exercise of stock options                                       249,016         107,712          59,432
    Employee stock purchase plan                                    655,378              --              --
                                                              --------------- --------------- ---------------
      Net cash (used in) provided by financing activities        (1,572,412)         25,275       3,633,815
                                                              --------------- --------------- ---------------

      Net increase (decrease) in cash and cash equivalents        4,912,472      (3,501,641)      7,456,138

CASH AND CASH EQUIVALENTS,
    beginning of year                                             7,488,590      10,990,231       3,534,093
                                                              --------------- --------------- ---------------

CASH AND CASH EQUIVALENTS,
    end of year                                               $12,401,062       $ 7,488,590     $10,990,231
                                                              =============== =============== ===============



                                                                   1997            1996            1995
                                                              --------------- --------------- ---------------
SUPPLEMENTAL CASH FLOWS DISCLOSURES:

    Cash paid during the year:
      Interest                                                  $    27,416     $    77,782    $    135,644
      Income taxes                                                2,171,422       1,712,200         588,149
</TABLE>

                     The accompanying notes to consolidated
                      financial statements are an integral
                            part of these statements.

                                       F-8
<PAGE>
                              DIANON SYSTEMS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


(1)      THE COMPANY

         DIANON Systems, Inc. (the "Company") provides a full line of anatomic
pathology testing services, as well as a number of genetic and clinical
chemistry testing services to patients, physicians and managed care
organizations throughout the United States. A significant portion of the
services provided by the Company are paid for by either the patients' Medicare
or private medical insurance carriers. The remaining services are generally paid
for by patients, physicians or hospitals directly.

(2)      SIGNIFICANT ACCOUNTING POLICIES

Principles of Consolidation -

         The consolidated financial statements include the accounts of the
Company and all of its subsidiaries. All significant intercompany transactions
have been eliminated in consolidation.

Use of Estimates -

         The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.

Cash and Cash Equivalents -

         The Company considers all highly liquid instruments purchased with a
maturity of three months or less to be cash equivalents. At December 31, 1997
and 1996, the Company had approximately $12 million and $6 million,
respectively, invested in short-term U.S. treasury funds with maturities of less
than three months. The carrying amount of the cash equivalents approximates its
fair value due to the relatively short period to maturity of these instruments.
Interest income per the consolidated statements of operations is presented net
of interest expense of $26,869, $77,466 and $136,113 for 1997, 1996 and 1995,
respectively.

Inventory -

         Inventory consists primarily of bulk reagents, specimen collection kits
and devices. Inventories are stated at the lower of cost or market. Cost is
determined using the first-in, first-out method.

Intangible Assets -

         Intangible assets are amortized on a straight-line basis over the
respective economic life as follows:


                                 Years
                                 -----

                    Unamortized customer lists       7
                    Noncompete agreement             5

         The Company periodically reviews the anticipated revenues related to
intangible assets to determine whether any adjustment to their carrying value is
necessary. During 1996, the Company recorded an accelerated amortization charge
of approximately $44,000, based on the Company's revised estimate of future
benefits from a customer list.


                                       F-9
<PAGE>
                              DIANON SYSTEMS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


Revenue Recognition -

         Revenues are recognized in the period in which services are provided.
Revenues subject to Medicare, direct physician and hospital billing are based on
fixed reimbursement fee schedules. All remaining revenues subject to third-party
reimbursement are recorded at estimated reimbursable amounts based on Uniform
Customary Charges. Such estimates are revised periodically based upon the
Company's actual reimbursement experience.

Depreciation and Amortization -

         Laboratory and office equipment is depreciated using the straight-line
method over a useful life of two to seven years. Leasehold improvements are
amortized over the shorter of their economic useful life or the remaining life
of the lease.

Research and Development -

         Research and development costs are charged to expense as incurred.

Income Taxes -

         The Company utilizes the liability method of accounting for income
taxes as set forth in Statement of Financial Accounting Standards No. 109,
"Accounting for Income Taxes." Under this method, deferred income taxes are
determined based on the difference between the financial statement and tax bases
of assets and liabilities using presently enacted tax rates and regulations.

Earnings Per Share -

         In 1997, the Company has adopted Statement of Financial Accounting
Standards No. 128 "Earning per share," effective December 15, 1997. Basic
earnings per share have been computed based on the weighted average number of
common shares outstanding during each year. Diluted earnings per share have been
computed based on the weighted average number of common shares and common
equivalent shares outstanding during each year. Common equivalent shares
outstanding include the common equivalent shares calculated for warrants and
stock options under the treasury stock method. Reported earnings per share for
all prior periods have been restated.

Below is a reconciliation of the numerators and denominators of the basic and
diluted EPS computations:

<TABLE>
<CAPTION>
                                                                   1997               1996             1995
                                                                   ----               ----             ----
<S>                                                           <C>                 <C>              <C>
BASIC EARNING PER SHARE
Weighted-average number of common shares outstanding               6,430,060         6,151,061        5,542,402

DILUTED EFFECT OF:
Stock options / ESPP                                                 378,190           136,098            6,878
                                                               --------------     -------------    -------------

DILUTED EARNINGS PER SHARE
Weighted-average number of common shares outstanding               6,808,250         6,287,159        5,549,280
                                                               ==============     =============    =============

NET INCOME                                                        $3,297,697        $2,170,116         $107,096
                                                               ==============     =============    =============

BASIC EARNINGS PER SHARE                                               $0.51             $0.35            $0.02
                                                               ==============     =============    =============

DILUTED EARNINGS PER SHARE                                             $0.48             $0.35            $0.02
                                                               ==============     =============    =============

</TABLE>
                                      F-10
<PAGE>
                              DIANON SYSTEMS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


         Options to purchase 291,556 shares of common stock at prices ranging
from $8.75 and $12.25 per share were outstanding as of December 31, 1997 but
were not included in the computation of diluted earnings per share because the
options' exercise price was greater than the average market price of common
shares.

Foreign Currency Translation -

         In 1995, the Company charged to income the Germany currency translation
adjustment of $160,567 due to management's decision to discontinue European
based operations.

Reclassifications -

         Certain reclassifications have been made to prior year amounts to
conform to the classifications used in the current year presentation.

(3)      INCOME TAXES

    The income tax provisions for the years ended December  31, 1997, 1996 and 
1995 consist of the following:

<TABLE>
<CAPTION>
                                                               Year Ended December 31
                                                     -------------------------------------------
                                                          1997            1996         1995
                                                     ---------------- ------------- ------------
<S>                                                  <C>              <C>           <C> 
Current
    Federal                                              $2,444,187    $1,387,967     $461,361
    State                                                   721,544       446,091      152,593
                                                     ---------------- ------------- ------------
         Total Current                                    3,165,731     1,834,058      613,954
                                                     ---------------- ------------- ------------
Deferred
    Federal                                                (598,785)     (152,112)     (33,532)
    State                                                  (154,412)      (44,841)     (71,504)
                                                     ---------------- ------------- ------------
         Total Deferred                                    (753,197)     (196,953)    (105,036)
                                                     ---------------- ------------- ------------

Total provision for income taxes                         $2,412,534     $1,637,105     $508,918
                                                     ================ ============= ============

</TABLE>

    The reasons for the differences between the statutory and effective rates
are as follows:

<TABLE>
<CAPTION>
                                                                  Year Ended December 31
                                                         ------------------------------------------
                                                             1997          1996          1995
                                                         -------------- ------------ --------------
<S>                                                      <C>            <C>          <C>
Statutory federal income tax rate                              34.0%        34.0%          34.0%
State taxes, net of federal tax benefit                         6.6          7.0            8.7
Utilization of research & development credits                    --           --           (5.7)
Utilization of AMT credit                                        --           --           (4.6)
Non-deductible expenses                                         1.3          2.9            9.6
Non-deductible write-down of investment in stock                (.1)          .7           37.5
Other                                                            .4         (1.6)           3.1
                                                         ============== ============ ==============
                                                               42.2%        43.0%          82.6%
                                                         ============== ============ ==============
</TABLE>


                                       F-11
<PAGE>
                              DIANON SYSTEMS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


    The net deferred tax asset is a result of the following temporary
differences:

<TABLE>
<CAPTION>
                                                                      Year Ended December 31
                                                            -------------------------------------------
                                                                1997           1996           1995
                                                            -------------- -------------- -------------
<S>                                                         <C>             <C>            <C>
Allowance for bad debts                                         $520,986       $428,761      $316,090
Accrued expense                                                  417,457         (4,395)       19,982
Depreciation                                                     416,824         95,067       (62,256)
Compensation not currently recognized for tax reporting          215,103        180,126       213,100
International restructuring reserve                               72,835        196,417       188,415
Amortization                                                      43,783         37,264        22,441
Other                                                                 --            550        67,480
                                                            ============== ============== =============
                                                               $1,686,988      $933,790      $765,252
                                                            ============== ============== =============
</TABLE>

         During 1996 and 1995, the Company recorded a capital write-down of
$61,846 and $529,625, respectively, for which a tax benefit has not been
recognized, $9,064 of that write-down was subsequently recovered in 1997.

(4)      LEASE OBLIGATIONS

         Included in property and equipment at December 31, 1997 and 1996 is
laboratory and office equipment held under capitalized leases as follows:

                                                      1997          1996
                                                      ----          ----
      Property and equipment                        $278,645      $752,240
      Less - accumulated depreciation                (135,181)     (660,312)
                                                  ============= =============
                                                     $143,464     $  91,928
                                                  ============= =============

         The future minimum lease payments under non-cancelable operating leases
and the present value of future minimum capital lease payments at December 31,
1997 are:

                                                         Capital     Operating
                                                          Leases       Leases
                                                          ------       ------

   1998                                                 $  52,468    $  882,405
   1999                                                    38,302       798,073
   2000                                                    34,440       797,126
   2001                                                    34,440       730,695
   2002                                                    15,756       710,775
   Thereafter                                                  --       296,156
                                                       -------------------------
   Minimum lease payments                                 175,406    $4,215,230
                                                                   =============
   Less - amount representing interest                     26,487
                                                       -----------
   Present value of total minimum lease payments         $148,919
                                                       ===========

         Total rental expense relating to operating leases for the years ended
December 31, 1997, 1996, and 1995 was $997,869, $1,041,127 and $864,549,
respectively.

         The Company leases office and laboratory space at two facilities in
Stratford, Connecticut. One lease expires in May 2003 and contains an option to
renew for up to three years and the other is on a year-to-year basis. The annual
rent on these leases will be increased by a pro rata portion of the increase in
real estate taxes and the increase in common area maintenance.

         The Company also leases four regional sales offices located in Florida,
North Carolina, Texas and Ohio. The terms of the leases range from one to three
years.

                                       F-12
<PAGE>
                              DIANON SYSTEMS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


         In March 1996, the Company executed a lease for a laboratory facility
in Wilmington, Ohio with a five-year term commencing April 1, 1996 and a renewal
option for five additional terms of three years each.

         Subsequent to year-end in connection with an acquisition (see Note 14),
the Company entered into a lease for an office and laboratory facility in Tampa,
Florida for a five-year term commencing January 31, 1998 with an option to renew
for an additional five-year period. In addition, the Company assumed leases for
four branch offices in Florida with remaining terms of up to two years.

(5)      STOCK-BASED COMPENSATION PLANS

          In June 1991, the Company adopted the 1991 Stock Incentive Plan which
provides for up to 400,000 shares of the Company's Common Stock, par value $.01
per share ("Common Stock"), to be reserved for potential future issuance of
stock options or awards. This plan is the successor to the Company's previous
plan which expired. In June 1994, the Company offered certain officers and key
employees the opportunity to revise the terms of their original stock options
issued in 1991, 1992 and 1993; all such revisions are reflected in the
information presented below. As of December 31, 1997, 12,213 shares of Common
Stock are available under the 1991 Stock Incentive Plan for future issuance. The
majority of the options vest 40% in the second year after grant and 20% each
year thereafter and expire ten years from the original grant date.

          In October 1996, the Company's shareholders approved the Company's
adoption of the 1996 Stock Incentive Plan, which provides for up to 700,000
shares of Common Stock to be reserved for potential future issuance of stock
options or awards. This plan is the successor to the 1991 Stock Incentive Plan
for which only a limited number of shares of Common Stock remain available for
grants. As of December 31, 1997, 198,514 shares of Common Stock are available
under the 1996 Stock Incentive Plan. The majority of options issued to officers
and key employees of the Company vest at a rate of 40% in the second year after
grant and 20% per year thereafter or 40% in the third year after grant and 20%
per year thereafter and expire ten years from the original date of grant. The
majority of options issued to directors vest at a rate of 10% per quarter and
expire ten years from the original date of grant.

         The Company accounts for these plans under Accounting Principles Board
Opinion No. 25, under which no compensation cost has been recognized. Had
compensation cost for these plans been determined consistent with the Statement
of Financial Accounting Standards No. 123, the Company's net income and earnings
per share would have been reduced to the following pro forma amounts:

<TABLE>
<CAPTION>
                                                      1997          1996         1995
                                                      ----          ----         ----
<S>                              <C>              <C>           <C>           <C>
Net Income:                       As Reported      $3,297,697    $2,170,116    $107,096
                                  Pro Forma        $2,703,542    $1,586,169     $11,403
Basic earnings per share:         As Reported         $.51          $.35         $.02
                                  Pro Forma           $.42          $.26         $.00
Diluted earnings per share:       As Reported         $.48          $.35         $.02
                                  Pro Forma           $.40          $.25         $.00

</TABLE>


                                       F-13
<PAGE>
                              DIANON SYSTEMS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

         For purposes of the pro forma information above, the fair value of each
option grant is estimated on the date of grant using the Black-Scholes option
pricing model with the following weighted average assumptions used for grants in
1997, 1996 and 1995, respectively,: risk-free interest rates of 6.52, 6.67 and
6.78 percent; expected lives of 8.6 for 1997 and 8.1 years for 1996 and 1995;
expected volatility of 74 percent for 1997 and 80 percent for 1996 and 1995. A
summary of the status of the Company's two fixed stock option plans as of
December 31, 1997, 1996 and 1995, and changes during the years ending on those
dates is presented below:

<TABLE>
<CAPTION>
                                     -------------------------- ------------------------- --------------------------
                                               1997                       1996                      1995
                                     -------------------------- ------------------------- --------------------------
                                                    WEIGHTED                  WEIGHTED                  WEIGHTED
                                                    AVERAGE                   AVERAGE                    AVERAGE
                                                    EXERCISE                  EXERCISE                  EXERCISE
FIXED OPTIONS                          SHARES        PRICE        SHARES       PRICE        SHARES        PRICE
- -------------                          ------        -----        ------       -----        ------        -----
<S>                                 <C>           <C>           <C>           <C>          <C>         <C>
Outstanding at beginning of  year      597,676       $6.00       397,153       $5.42        298,736       $5.89
Granted                                338,351        8.61       296,550        6.43        197,409       5.26
Exercised                               (51,764)      4.81        (23,621)      4.56         (4,688)      4.08
Forfeited / cancelled                  (102,805)      5.65        (72,406)      5.06        (94,304)      6.78
                                       ---------                  --------                  --------
Outstanding at end of year              781,458       7.24        597,676       6.00        397,153       5.42
                                        --------                  --------                  --------
Options exercisable at year-end          152,218      6.24        120,512       6.35         93,440       6.73
Weighted-average fair value of
   options granted                      $6.82                     $5.19                        $4.25
                                     ------------ ------------- ----------- ------------- ----------- --------------

</TABLE>

         The table below contains information with respect to the 781,458
options outstanding for the Company's 1991 and 1996 Stock Incentive Plan as of
December 31, 1997:

<TABLE>
<CAPTION>
                                EXERCISE PRICE                                          EXERCISABLE OPTIONS
                     --------------------------------------                    --------------------------------------
                                                                                                       WEIGHTED 
      OPTIONS                                WEIGHTED           REMAINING                               AVERAGE
    OUTSTANDING            RANGE             AVERAGE        CONTRACTUAL LIFE        OPTIONS         EXERCISE PRICE
    -----------            -----             -------        ----------------        -------         --------------
<S>                  <C>                    <C>             <C>                    <C>            <C>  
      175,594          $4.13 - $6.00          $4.91                5.8              105,936             $4.76
      570,152          $6.01 - $9.00          $7.75                9.4              12,928              $6.92
      35,712          $9.01 - $10.75          $10.59               2.9              33,354              $10.68

</TABLE>

         In addition to the disclosures above related to options granted under
the Company's 1991 Stock Incentive Plan and 1996 Stock Incentive Plan, the
disclosure that follows relates to options granted pursuant to employment
agreements or otherwise not under such plans.

         In January 1995, the Chief Executive Officer of the Company resigned
his employment with the Company. As part of the severance agreement, stock
options to purchase 69,916 shares of Common Stock at prices ranging from $4.56
to $10.75 were canceled and stock options to purchase 116,084 shares of Common
Stock were amended to set their exercise price at $5.25. These amended options
have fully vested as of December 31, 1997 and remain outstanding.

         In July 1995, the Company adopted the DIANON Systems, Inc. Employee
Stock Purchase Plan (the "ESPP" or "Plan") as described in Section 423 of the
Internal Revenue Code. The Plan provides for the sale of not more than 300,000
shares of Common Stock, subject to adjustments in the event of stock splits and
other changes in capitalization. The Plan provides that all shares issued
pursuant to the Plan be treasury shares acquired by the Company in open market
transactions and that no shares issued will be authorized but unissued Common
Stock. Commencing on August 15, 1995, the Company offered the ESPP to eligible
employees as defined by the Plan at a purchase price equal to the lesser of 85%
of the market price at the date of grant or 85% of the market price at the date
of purchase or as otherwise defined in the grant offering.


                                       F-14
<PAGE>
                              DIANON SYSTEMS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


         In May 1996, the Company granted an officer options to purchase 200,000
shares of Common Stock at $5.69 per share pursuant to the terms of an employee
agreement. These options vest 40% in May 1998 and 20% over each year thereafter.

         In October 1996, the Company granted options to purchase 10,000 shares
of Common Stock at $7.13 per share to an outside director of the Company, in
replacement of options issued in June 1993. These options vested immediately and
expire ten years from the date of grant.

         In January 1997, the Company purchased 89,000 shares of Common Stock
from the then Chairman of the Board, at the current market price of $8.50 per
share.

(6)      RELATED PARTIES

         The Company pays a stockholder, who is also Chairman Emeritus, and who
was a director until January 1995, a royalty of 6% of revenue on sales of
certain technology covered by a license agreement. In addition, the Company
provides this stockholder with certain insurance benefits, the use of an
automobile and the reimbursement of expenses incident to his performance as a
consultant to the Company. The Company paid licensing and royalty fees to this
stockholder of approximately $42,000, $79,000 and $122,000 during the years
ended December 31, 1997, 1996 and 1995, respectively.

         In 1995, the Company entered into a three-year research and development
agreement with Brigham & Women's Hospital, Inc. The agreement required the
Company to make quarterly payments of $30,000 in exchange for an option to
obtain rights in certain existing inventions as well as inventions developed
during the course of the research in the areas of cancer detection and
diagnosis. The research was to be conducted by a director of the Company. The
Company paid $60,000, $120,000 and $60,000 under this agreement in 1997, 1996
and 1995, respectively. The Company terminated this agreement effective as of
June 30, 1997 and has made all required payments as of December 31, 1997. In
addition, the Company made payments to Brigham & Women's Hospital, Inc. of
$30,000 in each of 1996 and 1995 for consulting services.

         Pursuant to his employment agreement, the President of the Company
received a loan in 1996 totaling $150,000 which bears interest at 5.9%, payable
annually, and is repayable upon termination with the Company. In addition, the
loan principal will be forgiven at a rate of $2,500 per month over the period
January 1998 through December 2002 if the President continues to be employed by
the Company.

         In the fourth quarter 1997, the Company entered into a one-year
consulting and proprietary information and inventions agreement with Dr. Jeffrey
L. Sklar, a director of the Company. The agreement requires the Company to make
quarterly payments at the beginning of each quarter for $5,000 in exchange for
delivery of services for molecular diagnosis. The Company paid $5,000 under this
agreement in 1997.

         See also Note 13.

(7)      RESTRUCTURING COSTS

         In 1995, the Company provided for a reserve of $279,000 due to
management's decision to discontinue European based operations, of which
approximately $20,000 remains. The Company is in the final process of
liquidating the European based operations and plans to complete the liquidation
process during 1998.

(8)      COMMITMENTS

         The Company is involved in certain legal matters which periodically
arise in the normal course of business. Management believes that the outcome of
these legal matters will not have a material adverse effect on the financial
position and results of operations of the Company.


                                       F-15
<PAGE>
                              DIANON SYSTEMS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(9)       EMPLOYEE BENEFIT PLAN

         The Company established a 401(k) employee benefit plan pursuant to
which participants receive certain benefits upon retirement, death or
termination of employment. The Company is required to contribute amounts equal
to 20% of the contributions made by employees up to 1% of their total annual
salary (subject to tax code limits). The Company contributed approximately
$105,000, $88,000 and $67,000 to the plan during 1997, 1996 and 1995,
respectively. The Company offers no other post-retirement benefits or
post-employment benefits to its employees.

(10)     INVESTMENT IN COMMON STOCK AND WARRANTS

         During 1995, the Company recorded charges of $530,000 to write-down the
investment in common stock of a publicly traded company as the loss in value was
deemed other than temporary. During 1996, a similar charge of $62,000 was
recorded to completely write-off the investment.

(11)     RIGHTS AGREEMENT

         On April 29, 1994, the Board of Directors of DIANON Systems, Inc.
declared a dividend distribution of one Right for each outstanding share of
Common Stock, par value $.01 per share, of the Company to stockholders of record
on May 10, 1994. Each Right entitles the registered holder to purchase from the
Company a unit ("Unit") consisting of one one-hundredth of a share of Series A
Junior Participating Preferred Stock, par value $.01 per share, of the Company,
at a price of $20 per Unit, subject to adjustment, upon change of control in the
Company, as defined in the rights agreement.

(12)     SEVERANCE COSTS

         The Company recorded charges of approximately $324,000, $148,000 and
$595,000 during 1997, 1996 and 1995, respectively, for severance costs as a
result of streamlining its operations and of the resignation of certain officers
of the Company. The remaining reserve as of December 31, 1997 is approximately
$218,000.

(13)     PRIVATE PLACEMENT

         On October 5, 1995, the Company completed a $5,612,000 private
placement with an investor for one million shares of Common Stock and a two-year
warrant for 800,000 shares exercisable at $6.00 per share of Common Stock
(except as otherwise described below). The Company received cash of $5,316,000
and a two-year promissory note for $296,000 bearing 7% interest, which note was
classified as a reduction to additional paid-in capital. Some or all of the
warrants could be exercised at a price of $5.00 at any time on or before October
31, 1996. Upon such election the Company would be required to extinguish as an
adjustment to the purchase price paid for such warrants, for each such warrant
for which such election has been made, $0.37 of the principal amount of the note
upon payment of the interest due on such extinguished amount for the outstanding
period. If the warrants for 800,000 shares were all exercised on or before
October 31, 1996, the two year promissory note for $296,000 would be fully
extinguished. On August 20, 1996, the Company's Board of Directors approved an
amendment to the terms of the warrants to extend from October 4, 1996 to October
31, 1996, the date through which the warrants could be exercised at $5.00 per
share. The amendment was approved in connection with the scheduling of the
Company's Annual Meeting for October 24, 1996 to enable voting at such meeting
on the Company's agreement to enable the investor to vote shares of the
Company's common stock owned by such investor and certain affiliates
representing up to 20% of the total voting power of the Company's voting
securities outstanding from time to time to be completed prior to the expiration
of the $5.00 per share exercise price. The Company's agreement was approved at
the Company's Annual Meeting on October 24, 1996. On October 29, 1996, the
investor exercised warrants for all 800,000 shares and in exchange for the
payment of approximately $4.0 million in cash representing the aggregate
exercise price of such warrants and interest on the principal amount of the
two-year promissory note for the outstanding period, the Company issued to the
investor 800,000 shares of its Common Stock and fully extinguished and cancelled
the promissory note.

(14)     SUBSEQUENT EVENT

         On February 1, 1998, the Company acquired certain assets of a pathology
laboratory located in Tampa, Florida and the acquisition will be accounted for
pursuant to the purchase method of accounting.


                                      F-16
<PAGE>
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS



To DIANON Systems, Inc.:

         We have audited in accordance with generally accepted auditing
standards, the consolidated financial statements of DIANON Systems, Inc. and
subsidiary companies included in this Form 10-K and have issued our report
thereon dated February 18, 1998. Our audits were made for the purpose of forming
an opinion on the basic consolidated financial statements taken as a whole. The
schedule listed in the index to consolidated financial statements is the
responsibility of the Company's management and is presented for purposes of
complying with the Securities and Exchange Commission's rules and is not part of
the basic consolidated financial statements. This schedule has been subjected to
the auditing procedures applied in the audits of the basic consolidated
financial statements and, in our opinion, fairly states in all material respects
the financial data required to be set forth therein in relation to the basic
consolidated financial statements taken as a whole.


                                              ARTHUR ANDERSEN LLP



Stamford, Connecticut
February 18, 1998



                                      F-17
<PAGE>
                              DIANON SYSTEMS, INC.
                SCHEDULE II -- VALUATION AND QUALIFYING ACCOUNTS

<TABLE>
<CAPTION>
                                                        Balance at
                                                       Beginning of     Provision for       Charges to     Balance at End
                                                           Year           Allowance         Allowance          of Year
                                                      ---------------- ----------------- ----------------- ----------------
<S>                                                   <C>               <C>               <C>              <C>
For the year ended December 31, 1995:
    Allowance for bad debts                               $  735,250         $  51,670     $          --       $  786,920
    Domestic restructuring reserve                            37,748                --            33,191            4,557
    International restructuring reserve                       62,702           118,000            18,661          162,041
    Non-deductible write-down of investment
         in stock                                                 --           529,625                --          529,625

For the year ended December 31, 1996:
    Allowance for bad debts                                  786,920           270,000                --        1,056,920
    Domestic restructuring reserve                             4,557                --             4,557               --
    International restructuring reserve                      162,041                --             6,566          155,475
    Non-deductible write-down of investment
         in stock                                            529,625                --           529,625               --

For the year ended December 31, 1997:
    Allowance for bad debts                                1,056,920           300,294            65,119        1,292,095
    International restructuring reserve                      155,475                --           135,404           20,071

</TABLE>


                                      F-18
<PAGE>
                                  EXHIBIT INDEX
                                  -------------


Exhibit
Document                                                  
No.                                   Reference     
- ---                                   ---------     

3.1      Restated Certificate of Incorporation of the Company, as amended
         through June 12, 1991 (incorporated by reference to Exhibit 3.1 of the
         Registrant's Registration Statement No. 33-41226).

3.2      Restated By-Laws of the Company, as amended through October 24, 1996
         (incorporated by reference to Exhibit 4.2 of the Registrant's
         Registration Statement No. 333-18817).

3.3      Restated By-Laws of the Company, as amended through February 2, 1997
         (incorporated by reference to Exhibit 4.2 of the Registrant's
         Registration Statement No. 333-18817).

10.1     Consulting Agreement, dated August 4, 1989, between DIANON Systems,
         Inc. and Nonda Katopodis (incorporated by reference to Exhibit 10.7 of
         the Registrant's Registration Statement No. 33-41226).**

10.2     Executive Vesting Agreement, dated as of June 11, 1991, between DIANON
         Systems, Inc. and James B. Amberson (incorporated by reference to
         Exhibit 10.13 of the Registrant's Registration Statement No.
         33-41226).**

10.3     1991 Stock Incentive Plan (incorporated by reference to Exhibit 10.17
         of the Registrant's Registration Statement No. 33-41226).**

10.4     Management Incentive Plan (incorporated by reference to Exhibit 10.18
         of the Registrant's Registration Statement No. 33-41226).**

10.5     Stock Option Grant to Walter O. Fredericks, dated April 27, 1990
         (incorporated by reference to Exhibit 10.23 of the Registrant's
         Registration Statement No. 33-41226).**

10.6     Stock Option Grant to Richard A. Sandberg, dated June 12, 1991
         (incorporated by reference to Exhibit 10.24 of the Registrant's
         Registration Statement No. 33-41226).**

10.7     Stock Option Grant to Richard A. Sandberg, dated June 12, 1991
         (incorporated by reference to Exhibit 10.25 of the Registrant's
         Registration Statement No. 33-41226).**

10.8     Lease Agreement, made as of February 14, 1989, between Watson Boulevard
         Development Limited Partnership, as lessor, and DIANON Systems, Inc.,
         as lessee, for premises located at 200 Watson Boulevard (incorporated
         by reference to Exhibit 10.29 of the Registrant's Registration
         Statement No. 33-41226).

10.9     License Agreement, dated June 9, 1983, between Sloan-Kettering
         Institute for Cancer Research and N-K Laboratories Limited Partnership
         (incorporated by reference to Exhibit 10.30 of the Registrant's
         Registration Statement No. 33-41226).

10.10    License Agreement, dated July 29, 1987, between University of Rochester
         and DIANON Systems, Inc. (incorporated by reference to Exhibit 10.32 of
         the Registrant's Registration Statement No. 33-41226).

10.11    Development Agreement, effective September 25, 1987, between
         Connecticut Product Development Corporation and DIANON Systems, Inc.
         (incorporated by reference to Exhibit 10.33 of the Registrant's
         Registration Statement No. 33-41226).

10.12    Stock Option Grant to James B. Amberson, dated April 23, 1991
         (incorporated by reference to Exhibit 28.1 to the Registrant's
         Quarterly Report on Form 10-Q for the quarter ended September 30,
         1991).**

10.13    Stock Option Grant to Richard A. Sandberg, dated June 12, 1991, as
         amended (incorporated by reference to Exhibit 10.37 to the Registrant's
         Annual Report on Form 10-K for the year ended December 31, 1991).**

10.14    Asset Purchase Agreement, dated April 30, 1993, by and among the
         Registrant and Molecular Oncology, Inc., and Oncologix, Inc.
         (incorporated by reference to Exhibit 1.1 to the Registrant's Form 8-K
         dated April 30, 1993, filed with the Securities and Exchange Commission
         on May 14, 1993).

10.15    Asset Purchase Agreement, dated June 29, 1993, by and among the
         Registrant and Collaborative Research, Inc. (incorporated by reference
         to Exhibit 1.2 to the Registrant's Form 8-K dated June 29, 1993, filed
         with the Securities and Exchange Commission on July 13, 1993).


                                      F-19
<PAGE>
Exhibit
Document
No.                              Reference
- ---                              ---------

10.16    Term Loan Agreement, dated July 14, 1993, by and among the Registrant
         and the Union Trust Company (incorporated by reference to Exhibit 10.34
         to the Registrant's Annual Report on Form 10-K/A Amendment 1 for the
         year ended December 31, 1993, filed with the Securities and Exchange
         Commission on April 28, 1994).

10.17    Rights Agreement, dated April 29, 1994, by and among the Registrant and
         American Stock and Trust Company, as Rights Agent (incorporated by
         reference to Exhibit 1 to the Registrant's Form 8-K dated April 29,
         1994, filed with the Securities and Exchange Commission on May 9,
         1994).

10.18    Severance Agreement, dated January 20, 1995, by and among the
         Registrant and John P. Davis (incorporated by reference to Exhibit
         10.36 to the Registrant's Annual Report on Form 10-K for the year ended
         December 31, 1995, filed with the Securities and Exchange Commission on
         March 29, 1996).**

10.19    Employment Agreement, dated May 3, 1996, by the Registrant and Kevin C.
         Johnson (incorporated by reference to Exhibit 10.37 to the Registrant's
         Quarterly Report on Form 10-Q for the quarter ended June 30, 1996).**

10.20    Executive Employment Agreement, dated September 1, 1996, by the
         Registrant and Richard A. Sandberg (incorporated by reference to
         Exhibit 10.38 to the Registrant's Quarterly Report on Form 10-Q for the
         quarter ended September 30, 1996).**

10.21    Employment Agreement, dated September 1, 1996, by the Registrant and
         Dr. James B. Amberson (incorporated by reference to Exhibit 10.39 to
         the Registrant's Quarterly Report on Form 10-Q for the quarter ended
         September 30, 1996).**

10.22    Executive Employment Agreement, dated September 1, 1996, by the
         Registrant and Dr. James B. Amberson (incorporated by reference to
         Exhibit 10.40 to the Registrant's Quarterly Report on Form 10-Q for the
         quarter ended September 30, 1996).**

10.23    Severance Agreement, dated September 27, 1996, by the Registrant and
         Carl R. Iberger (incorporated by reference to Exhibit 10.41 to the
         Registrant's Quarterly Report on Form 10-Q for the quarter ended
         September 30, 1996).**

10.24    Employment Agreement, dated September 30,1996, by the Registrant and
         David R. Schreiber (incorporated by reference to Exhibit 10.42 to the
         Registrant's Quarterly Report on Form 10-Q for the quarter ended
         September 30, 1996).**

10.25    Employment Agreement, dated November 18, 1996, by the registrant and
         Steven T. Clayton.**

10.26    Severance Agreement dated November 18, 1996, by the registrant and
         Daniel J. Cronin, III.**

10.27    Amendment dated as of October 4, 1995 to Rights Agreement dated as of
         April 29, 1994 between the Registrant and American Stock Transfer and
         Trust Company, as Rights Agent (incorporated by reference to Exhibit
         No. 1 to the Registrant's Form 8-K dated October 30, 1996 filed with
         the Securities and Exchange Commission on November 8, 1995).

10.28    1996 Stock Incentive Plan (incorporated by reference to Appendix A to
         the Registrant's Statement on Schedule 14A filed with the Securities
         and Exchange Commission on September 23, 1996).**

10.29    Stock and Warrant Purchase Agreement, dated as of October 4, 1995,
         among the Gilbert Family Trust, the G.S. Beckwith Gilbert I.R.A.
         Contributory Account, G.S. Beckwith Gilbert and the Registrant.

10.30    Registration Rights Agreement, dated as of October 4, 1995, among the
         Gilbert Family Trust, the G.S. Beckwith Gilbert I.R.A. Contributory
         Account, G.S. Beckwith Gilbert and the Registrant.

10.31    Warrant No. 1, dated as of October 4, 1995, by the Registrant in favor
         of G.S. Beckwith.

10.32    Promissory Note, dated October 4, 1995, by G.S. Beckwith Gilbert in
         favor of the Registrant.

10.33    Stock Option Grant dated October 24, 1996 by the Registrant to Andre de
         Bruin.**

10.34    Stock Option Grant dated November 4, 1996 by the Registrant to Jeffrey
         M. Sklar, M.D.**

10.35    Loan Agreement dated December 3, 1996 by the Registrant to Kevin C.
         Johnson).**

10.36    Form of standard Stock Option Grant for outside directors.**



                                      F-20
<PAGE>
Exhibit
Document                                       
No.                                   Reference
- ---                                   ---------

10.37    Amendment to Warrant Certificate No. W-1 dated as of October 2, 1996
         between the Registrant and G.S. Beckwith Gilbert.

10.38    Severance Agreement dated February 27, 1997 by the Registrant and
         Richard A. Sandberg.**

10.39    Amendment dated April 30, 1997 by the Registrant and Richard A.
         Sandberg.**

10.40    Security Agreement dated April 30, 1997 by the Registrant and Richard
         A. Sandberg.**

10.41    Secured Promissory Note dated April 30, 1997 by the Registrant and
         Richard A. Sandberg.**

10.42    Non-Compete Agreement dated September 3, 1997 by the Registrant and
         Vernon L. Wells.**

10.43    Severance Agreement dated September 15, 1997 by the Registrant and
         Robert C. Verfurth.**

10.44    Consulting and Proprietary Information and Inventions Agreement dated
         October 1, 1997 by the Registrant and Dr. Jeffrey L. Sklar, MD, PhD
         (filed herewith).

10.45    Severance Agreement dated January 27, 1998 by the Registrant and Vernon
         L. Wells (filed herewith).**

11.1     Statement re: computation of per share earnings. *

22.1     List of Subsidiaries of the Company (incorporated by reference to
         Exhibit 22.1 of the Registrant's Registration Statement No. 33-41226).

23.1     1996 Consent of Arthur Andersen LLP (incorporated by reference to
         Exhibit 23.1 of the Registrant's Annual Report on Form 10-K for the
         year ended December 31, 1995).

23.2     1997 Consent of Arthur Andersen LLP (incorporated by reference to
         Exhibit 23.2 of the Registrant's Annual Report on Form 10-K for the
         year ended December 31, 1996).

23.3     1998 Consent of Arthur Andersen LLP (filed herewith).

27.1     Financial Data Schedule. 


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

         *        Not applicable or contained elsewhere herein.
         **       A management contract or compensatory plan or arrangement
                  required to be filed as an exhibit to this form pursuant to
                  Item 14(c) of this report.



                                      F-21





                                                                 Exhibit 10.44

                              DIANON SYSTEMS, INC.
         CONSULTING AND PROPRIETARY INFORMATION AND INVENTIONS AGREEMENT


         CONSULTING AND PROPRIETARY INFORMATION AND INVENTIONS AGREEMENT
("Agreement") made as of the date indicated herein below, by DIANON Systems,
Inc., ("DIANON") and the "Consultant" identified below, for good and valuable
consideration, and intending to be legally bound, hereby agree:

1. Consulting Services. In exchange for the Consulting Fee to be paid to
Consultant as provided herein, Consultant shall render to DIANON, or to such of
DIANON's affiliates or subsidiaries as DIANON shall request, the Consulting
Services more particularly described in Attachment 1 hereto. As of the effective
date of this Agreement, Consultant shall diligently pursue each of the
objectives stated in Attachment 1, and shall provide DIANON with such reasonable
summaries, reports, data, publications and other materials relating to the
Consulting Services as DIANON may reasonably request. In addition to the
Consulting Services specifically set forth in Attachment 1, Consultant shall at
all times during the Term of this Agreement, maintain reasonable availability
for discussions with, and inquiries from, DIANON's representatives in connection
with the Consulting Services, without regard as to whether such Consulting
Services are to be performed at the offices of DIANON or at such other locations
as the parties may provide. DIANON shall similarly make available to Consultant,
representatives of DIANON for the purpose of addressing any inquiries of the
Consultant with respect to matters pertaining to the Consulting Services. From
time-to-time, DIANON may require that the Consultant travel to locations which
are remote from the offices of either DIANON or the Consultant, in which event
DIANON shall upon the presentation by Consultant of reasonable substantiation
thereof, reimburse Consultant for all reasonable out-of-pocket expenses incurred
by Consultant in connection with such travel.

2. Consulting Fee. As full and complete compensation for the Consulting
Services, DIANON shall pay to Consultant (subject to any taxes, reductions or
other withholdings, as DIANON may be required to make from time-to-time), the
Consulting Fee more specifically described in Attachment 2 to this Agreement.
The Consulting Fee shall be paid by DIANON at such times, and upon such further
conditions as are specifically set forth in said Attachment 2.

3. Confidential and Proprietary Information. Consultant represents and
acknowledges that :

(a) During the Term of this Agreement, Consultant may be provided from
time-to-time with access to information which is confidential and/or proprietary
to DIANON or other parties to whom DIANON is obligated to maintain
confidentiality with respect to such information, including without limitation,
information which DIANON currently possesses and will in the future possess,
that has been or will be created, discovered or developed , or which will become
otherwise known to DIANON (including, without limitation, information arising
out of the Consulting Services), or in which property rights have been or will
be assigned or otherwise conveyed to DIANON , and which information will have
actual or economic value in the business in which DIANON is engaged, including
by way of illustration, but without limitation, trade secrets, processes,
formulae, data, know-how, improvements, inventions, techniques, marketing plans,
strategies, budgets, unpublished financial statements, forecasts and customer
lists ("Proprietary Information"). The Proprietary Information which the parties
currently anticipate will be disclosed to Consultant for the purposes of
rendering the Consulting Services is more fully described on Attachment 3 to
this Agreement, which may be amended from time-to-time to include such
additional information as may be necessary for the completion of the Consulting
Services; provided, however, that Attachment 3 shall in no event be deemed to
include all of the Proprietary Information to which Consultant may obtain
access, or which shall be the subject of Consultant's obligations of
non-disclosure hereunder.

(b) All Proprietary Information shall be the sole property of DIANON and its
assigns, and DIANON and its assigns shall be the sole owner of all patents,
copyrights, trademarks, know-how and other intellectual property rights relating
thereto, including any rights which Consultant might otherwise acquire in any
Proprietary Information

(c) Consultant shall not without the express written consent of an officer of
DIANON: (i) disclose, permit access to, or use the Proprietary Information, or
(ii) allow it to be used, for its own benefit or the benefit of others, or (iii)
analyze, or permit a third-party to analyze, either by abstraction, reverse
engineering or any other means, any materials constituting Proprietary
Information, but shall in all respects protect the Proprietary Information by
using the same degree of care, but no less than a reasonable degree of care, as
the Consultant uses to protect its own confidential information; provided,
however, that such minimum degree of care shall not constitute a defense by
Consultant in the event the Proprietary Information is not kept confidential or
is used other than in accordance with this Agreement.

<PAGE>
(d) Consultant's duties hereunder shall apply without regard as to whether the
Proprietary Information is: (a) disclosed by DIANON in writing or marked to
indicate that it is confidential at the time of disclosure; or (b) orally
disclosed by DIANON and reduced to writing within thirty (30) days; or (c)
disclosed in the form of tangible products or materials transmitted to the
Consultant. In all events, Consultant shall notify DIANON of any loss or
misplacement of Proprietary Information.

(e) Proprietary Information shall not include any information that is (i)
approved in writing by the disclosing party for release by the receiving party
without restriction; or (ii) that the receiving party is able to demonstrate by
signed writing was previously known by the receiving party at the time of
disclosure; or (iii) which is currently public knowledge or becomes public
knowledge in the future other than through the acts or omissions of the
receiving party or (iv) which is lawfully obtained by the receiving party from
sources independent of the disclosing party who have lawful rights to disclose
such Proprietary and Confidential Information.

(f) Consultant's duties with respect to the Proprietary Information shall apply
with respect to any like information of any of DIANON's customers, suppliers,
development venturers, licensees, licensors or other parties who may disclose
such like information to DIANON or to Consultant in the course of the
consultancy hereunder.

(g) In the event Consultant shall engage any person to assist in the provision
of the Consulting Services, Consultant shall cause such person(s) to execute an
agreement containing similar obligations prior to such person's engagement for
such purpose.

(h) In the event Consultant is required by judicial or administrative process to
disclose any Proprietary Information, Recipient shall promptly notify DIANON,
and shall allow DIANON a reasonable time to oppose such process.

(i) Consultant shall return all Proprietary Information received from or at the
request of DIANON, including without limitation, all biomaterials, files,
letters, memos, reports, sketches, drawings, laboratory notebooks, or other
written or electronically recorded material, except that Consultant may retain
in its confidential files, one copy of written Proprietary Information for
record purposes only. Such return, shall not constitute a defense to a claim of
breach of this Agreement or abrogate the continuing obligations of the
Consultant hereunder.

(j) Consultant has not and shall not in the future, disclose any information or
other rights of either the Consultant, or of any third-party, which Consultant
acquired prior to the date of this Agreement, and which Consultant is not
otherwise authorized to disclose.

(k) In the event DIANON believes there has been a breach of security regarding
the Proprietary Information, Consultant agrees that DIANON shall have the right
to visit the business premises of the Consultant in order to monitor and ensure
compliance with the terms of this Agreement.

4. Inventions. Consultant represents and acknowledges that:

(a) Consultant will promptly disclose to DIANON, or any other persons designated
by DIANON, all improvements, inventions formulae, processes, techniques,
know-how and data, whether or not patentable, made or conceived or reduced to
practice or learned by Consultant, alone or jointly with others, either relating
to the subject of the consultancy herein, or which result from the use of any of
the premises or materials owned or used under right by DIANON (all of the
foregoing being referred to herein as the "Inventions").

(b) All Inventions shall be the sole property of DIANON and its assigns on a
"work-for-hire" basis, and DIANON and its assigns shall be the sole owner of all
intellectual property rights and other rights in connection therewith.

(c) Consultant hereby assigns to DIANON any rights which Consultant may have or
acquire in all Inventions, except to the extent retained by specific provision
therefore in one or more of the Attachments hereto, and Consultant agrees to
assist DIANON in every appropriate way (but at DIANON's sole expense) to obtain
and from time-to-time to enforce, patents, copyrights, trademarks and other
rights and protections relating to the Inventions in any and all countries, and
to execute all documents for use in applying for and obtaining same, together
with any assignments thereof to DIANON or persons designated by DIANON, which
obligations shall continue beyond the termination of this Agreement, provided
DIANON shall compensate Consultant at a reasonable rate after such termination
for the time actually expended by Consultant upon such assistance. In the event

<PAGE>
DIANON is unable, after reasonable effort, to obtain Consultant's signature on
any document or documents required to apply for or prosecute any patent,
copyright, trademark or other right or protection relating to an Invention, for
any reason whatsoever, Consultant hereby irrevocably appoints DIANON and its
duly authorized officers and agents as Consultant's agent and attorney-in-fact
to execute and file such applications and to do all other necessary lawful and
permitted acts to further the prosecution and issuance of patents, copyrights,
trademarks or other similar protections, with the same legal force and effect as
if executed by Consultant.

(d) This Paragraph 4 does not apply to inventions which: (i) precede the date of
this Agreement, or (ii) which do not either relate to the Consulting Services to
be provided hereunder, or result from Consultant's use of DIANON's facility,
equipment, supplies, or the Proprietary Information.

5. Nonsolicitation. During the Term of this Agreement, and for a period of two
(2) years thereafter, Consultant shall not solicit any employees of DIANON to
leave their employ, or offer or cause to be offered, employment to any person
who was employed by DIANON at any time during the six (6) month period prior to
the termination of this Agreement.

6. Term and Termination. This Agreement shall commence as of the Effective Date
set forth above, and shall endure until October 1, 1998, unless earlier
terminated: (a) by the mutual written agreement of the parties at any time; (b)
upon sixty (60) days written notice from either of the parties for any reason or
for no reason; (c) upon the failure of either party to cure any material breach
within thirty (30) days written notice from the non-defaulting party advising of
such breach; or (d) immediately by DIANON in the event of any breach by
Consultant of the nondisclosure or nonsolicitation obligations set forth in this
Agreement.

7. Injunctive Remedies. The parties agree that in the event Consultant breaches
any of the provisions of Paragraphs 3, 4, or 5, DIANON will suffer immediate and
irreparable harm for which money damages will not constitute a full and adequate
remedy. Consultant acknowledges that injunctive relief is thereby warranted, and
hereby consents to jurisdiction in the United States District Court for the
District of Connecticut (or, if the Consultant believes the jurisdictional
requirements for such relief in such court are not met, then in the Superior
Court of the State of Connecticut at Bridgeport) so that the Court may enter an
appropriate injunctive order and such other relief as may be just and proper.
Without limitation as to any of the foregoing provisions, Consultant assumes
liability for all costs, expenses and damages (including, but not limited to,
attorney's fees and investigation costs) arising from any breach of this
Agreement by Consultant, including without limitation, unauthorized use or
unpermitted disclosure of Proprietary Information to third-parties by officers,
agents, attorneys, accountants, or employees of Consultant or any other person
to whom Consultant makes known any Proprietary Information. In addition to any
and all remedies available to DIANON at law or in equity respecting a breach
hereof, Consultant agrees, at its own expense, to take all reasonable measures
including but not limited to court proceedings, to restrain any person to whom
Consultant has disclosed Proprietary Information from using or disclosing such
information in a manner contrary to this Agreement.

8. Nonassignability. This Agreement may not be assigned by the Consultant
without the prior written consent of DIANON.

9. Governing Law. This Agreement shall be governed by and construed in
accordance with the laws of the State of Connecticut.

10. Jury Trial. In the event of any litigation among the parties hereto
concerning the subject matter of this Agreement or otherwise, the parties hereby
irrevocably waive any right they may now or hereafter possess to a trial by
jury.

11. Relationship. The parties do not intend that any employment, agency, joint
venture or partnership, relationship shall be created by this Agreement, but
that the Consultant shall serve hereunder solely in its capacity as an
independent contractor, and that in such capacity, shall have no authority
whatsoever to bind DIANON to any agreement, obligation or other liability,
without the express written consent of an authorized representative of DIANON in
each and every such instance.

12. Entire Agreement. This Agreement, together with the Attachments hereto,
contains the entire understanding of the parties, and all prior proposals,
discussions, and writings by and between the parties are hereby superseded, and
all additions or modifications to this Agreement, including those to any
Attachment referred to herein, shall be made in writing and executed by each of
the parties.

13. Waiver. No delay or failure on the part of either of the parties in
exercising any of its rights or remedies arising pursuant to this Agreement,
shall impair any such right or remedy or be construed as a waiver hereunder, and
no waiver of any of the obligations of the parties hereunder shall be valid

<PAGE>
unless signed by the party against whom such waiver is sought to be enforced,
and then only to the extent expressly provided therein.

14. Severability. In the event that any court or other tribunal of competent
jurisdiction holds that any provision of this Agreement is in violation of any
applicable law, such provision shall be enforced only to the extent it is not in
violation of such law or is not otherwise unenforceable, and all other
provisions of this Agreement shall remain in full force and effect.

15. Notices. All notices, demands, requests or other communications that may be,
or are required to be given hereunder, shall be in written form and shall be:
(a) personally delivered; (b) mailed by first-class registered or certified
mail, return receipt requested, postage prepaid; or (c) sent by facsimile
transmission and confirmed by recipient's facsimile transmission report, at the
addresses and telephone numbers stated below or submitted by the parties from
time-to-time.

16. Counterparts. This Agreement is to be executed in duplicate. Please return
one fully executed copy to: DIANON Systems, Inc., 200 Watson Boulevard,
Stratford, CT 06497, Attention: Grant Carlson, Director, Technology and Business
Development.

17. Publication: DIANON and Consultant must both agree to proceed with any
publication/promotion produced by, from or with sponsored by this Agreement.

18.  Attachments.  Attachments     No [ ]   Yes [ ]  If Yes, number of pages: 6




[GRAPHIC OMITTED]


Effective Date
October 1, 1997

DIANON SYSTEMS, INC.
200 Watson Boulevard
Stratford, CT 06497

/s/ Kevin C. Johnson          September 30, 1997
- --------------------          ------------------
Authorized Signature          Date

Kevin C. Johnson              President and Chief Executive Officer
- ----------------              -------------------------------------
Name                          Title


CONSULTANT:  Company/Individual

Jeffrey L. Sklar, MD, Ph.D.
49 Princeton Road
Chestnut Hill, Massachusetts 02167

/s/ Jeffrey Sklar              11/12/97
Authorized Signature           Date

Jeffrey Sklar
Name                           Title


<PAGE>
ATTACHMENT 1
SCOPE OF SERVICES FOR JEFFREY L. SKLAR, MD, PH.D.

Delivery of services for molecular diagnosis







<PAGE>
ATTACHMENT 2
CONSULTING FEE FOR JEFFREY L. SKLAR, MD, PH.D.

Effective October 1, 1997,

The consulting fee for Dr. Sklar is $5,000 per quarter,  Payable at the start 
of each quarter.  The payment schedule is as follows:


         October, 1997     $5,000
         January, 1997     $5,000
         April, 1998       $5,000
         July, 1998        $5,000






<PAGE>
                                                                  Attachment 3

                            CONFIDENTIALITY AGREEMENT

                  CONFIDENTIALITY AGREEMENT, dated as of September 30, 1997,
between Jeffrey L. Sklar, MD, PhD and DIANON Systems, Inc. ("DSI"), 200 Watson
Boulevard, Stratford, Connecticut 06496, (the "Companies").

                  The parties wish to consider a possible negotiated business
combination of the Companies (the "Transaction") and, in connection therewith,
the parties hereto agree as follows:

                  1. Nondisclosure of Confidential Information. (a) As used
herein, "Evaluation Material" means all data, reports, interpretations,
forecasts, records, statements, documents and information of any kind (whether
written, electronic or oral) concerning the Company providing such Evaluation
Material (the "Delivering Company") or any of its affiliates, which the
Delivering Company or any of its directors, officers, employees, agents or
representatives (collectively, "Representatives") provides to the other Company
(the "Receiving Company") or any of its Representatives; provided, however, that
"Evaluation Material" shall not include information that (i) has become
generally available to the public other than as a result of a disclosure by the
Receiving Company or any of its Representatives, (ii) was available to the
Receiving Company on a non-confidential basis prior to its disclosure to the
Receiving Company by the Delivering Company or its Representatives, or (iii) has
become available to the Receiving Company on a non-confidential basis from a
source other than the Delivering Company or its Representatives, provided that
such source is not known by the Receiving Company or its Representatives after
due inquiry of such source to be bound by a confidentiality agreement with the
Delivering Company or its Representatives or otherwise prohibited from
transmitting the information to the Receiving Company by a contractual, legal or
fiduciary obligation. As used herein, "Transaction Information" means (i) the
fact that discussions or negotiations are taking place concerning a possible
Transaction or the status thereof, (ii) the fact that this Agreement has been
entered into or that information has been furnished by either Company as
contemplated hereby and (iii) any of the matters covered by this Agreement. As
used herein, "Confidential Information" means the Evaluation Material and the
Transaction Information.

                  (b) Except as expressly permitted by the terms hereof, the
Receiving Company and its Representatives will not in any manner, directly or
indirectly, disclose, in whole or in part, any Confidential Information to any
person or use such Confidential Information for any purpose other than the
Receiving Company's consideration of the Transaction; provided, however, that
Confidential Information may be disclosed to the Receiving Company's
Representatives who need to know the Confidential Information for purposes of
participation in the Transaction, it being understood that they will be advised
by the Receiving Company of the confidential nature of such information and that
by receiving such information they are agreeing to be bound by this Agreement.
The Receiving Company shall be liable for any breach of this Agreement by its
Representatives.

                  (c) Upon written request of the Delivering Company, the
written Evaluation Material and all copies thereof (or of portions thereof) in
the possession of the Receiving Company and its Representatives will be promptly
returned to the Delivery Company or destroyed by Receiving Company. That portion
of the Confidential Information in the possession of the Receiving Company and
its Representatives not so returned, and oral Confidential Information, will be
held by the Receiving Company and kept subject to the terms of this Agreement or
destroyed.

                  2. Exceptions to Nondisclosure. (a) In the event that the
Receiving Company is requested (by oral questions, interrogatories, requests for
information or documents, subpoena, court order, civil investigative demand or
other process) to disclose any Confidential Information, which disclosure is not
otherwise permitted hereunder, it is agreed that the Receiving Company will
provide the Delivering Company with prompt notice of any such request or
requirement so that the Delivering Company may seek an appropriate protective
order or waive compliance with the provisions of this Agreement. If, failing the
entry of a protective order or the receipt of a waiver hereunder, the Receiving
Company is, in the reasonable written opinion of outside counsel for the
Receiving Company, compelled to disclose Confidential Information pursuant to
such re-quest or else stand liable for contempt or suffer other significant
penalty, the Receiving Company may disclose that portion of the Confidential
Information which such counsel has advised that the Receiving Company is
compelled to disclose as aforesaid. In any event, the Receiving Company will not
oppose action by, and will cooperate with, the Delivering Company to obtain an

<PAGE>
appropriate protective order or other reliable assurance that confidential
treatment will be accorded the Confidential Information. All references to the
Receiving Company in this paragraph shall be deemed to include the Receiving
Company's Representatives.

                  3. Restrictions on Activities. (a) For a period of five years
from the date of this Agreement, each Company agrees that it and its affiliates
will not (and will not assist or encourage others to) in any manner, directly or
indirectly, unless specifically requested in writing in advance by the other
Company's Board of Directors (i) acquire, or agree, offer or propose to acquire,
from the other Company or any other person, any business or assets of, or
securities issued by, the other Company or any right or option to acquire any of
the foregoing, (ii) make any proposal or request to the other Company or any of
its officers or directors relating, directly or indirectly, to any action
referred to in clause (i) of this paragraph or to any modification or waiver of
any provision of this Section 3(a) or Section 1(b), (iii) solicit proxies from
the other Company's shareholders or seek or propose to influence or control the
management or policies of the other Company (or request per-mission to do so),
(iv) enter into any discussions, negotiations, arrangements or understandings
with any other person with respect to any of the foregoing or (v) make any
public disclosure of any kind with respect to any of the foregoing or take any
other action which might reasonably be expected to result in any such public
disclosure. Notwithstanding the foregoing, if a tender or exchange offer to
acquire voting securities of a Company is made, without the approval of such
Company's Board of Directors, by any person other than the other Company or one
of its affiliates, which, if consummated, would give such person ownership of at
least 45% of the combined voting power of such Company's voting securities, the
other Company shall be entitled to submit a proposal to such Company's Board of
Directors to acquire the entire Company or to commence a cash tender offer for
at least the same number of securities tendered for in such other offer
(provided the other Company's tender offer provides for a cash second step
merger yielding a blended purchase price per share which is at least equal to
the purchase price per share offered in such other offer and in any subsequent
second step merger or acquisition transaction if one is proposed in such other
offer).

                  (b) Unless otherwise agreed to by the Companies, all (i)
communications regarding the Transaction, (ii) requests for additional
information, (iii) requests for facility tours or management meetings, and (iv)
discussions or questions regarding procedures, will be submitted or directed to
the signatories of this agreement.

                  4. No Representations or Warranties. Each Company acknowledges
and agrees that neither the Delivering Company nor any of its Representatives
makes any representation or warranty as to the accuracy or completeness of the
Evaluation Material. Each Company agrees that neither it nor its Representatives
shall have any claim against the other Company or any of its Representatives
resulting from the use of the Evaluation Material by it or its Representatives.

                  5. U.S. Securities Laws. Each Company acknowledges that it is
aware that the United States securities laws prohibit any person who has
material, non-public information concerning the other Company or the public sale
of the other Company, or a significant portion thereof from purchasing or
selling the other Company's securities or from communicating such information to
any other person or entity under circumstances in which it is reasonably
foreseeable that such person or entity is likely to purchase or sell such
securities.

                  6. Equitable Remedies. Each Company agrees that money damages
would not be a sufficient remedy for any breach of this Agreement by it or any
of its Representatives and that the other Company shall be entitled to specific
performance and injunctive or other equitable relief as remedies for any such
breach. Moreover, should litigation be necessary to enforce any provision
hereof, each Company agrees that, should the other Company prevail, the other
Company shall be entitled to recover all costs, including reasonable legal fees.
Such remedies shall not be deemed to be the exclusive remedies but shall be in
addition to all other remedies available at law or in equity to each Company.
Each Company waives, and agrees to use its best efforts to cause its
Representatives to waive, any requirement for the securing or posting of any
bond in connection with any such remedy.

                  7. Consent to Jurisdiction. Each Company hereby irrevocably
and unconditionally consents to the nonexclusive jurisdiction of the courts of
the State of New York and of the United States of America located in New York
City for any actions, suits or proceedings arising out of or relating to this
Agreement and the transactions contemplated hereby, and further agrees that
service of any process, summons, notice or document by U.S. certified mail to
its address set forth below its signature to this Agreement shall be effective
service of process for any action, suit or proceeding brought against it in any
such court. Each Company hereby irrevocably and unconditionally waives any

<PAGE>
objection to the laying of venue of any action, suit or proceeding arising out
of this agreement or the transactions contemplated hereby in the courts of the
State of New York or the United States of America located in New York City and
hereby further irrevocably and unconditionally waives and agrees not to plead or
claim in any such court that any such action, suit or proceeding brought in any
such court has been brought in an inconvenient forum.

                  8. Miscellaneous. If any of the provisions of this Agreement
is not enforceable in whole or in part, the remaining provisions of this
Agreement shall not be affected thereby. No failure or delay in exercising any
other right, power or privilege hereunder shall operate as a waiver thereof, nor
shall any single or partial exercise thereof preclude any other or further
exercise thereof or the exercise of any other right, power or privilege
hereunder. For purposes of this Agreement, the term "person" shall mean an
individual, corporation, partnership, limited liability company, association,
trust, governmental entity, any other organization or entity or any group
including any of the foregoing, and the terms "group" and "affiliate" shall have
the meanings provided under the Securities Exchange Act of 1934, as amended.

                  9. Governing Law. This Agreement shall be governed and
construed in accordance with the laws of the State of without giving effect to
its conflict of laws principles or rules.

                  IN WITNESS WHEREOF, the undersigned have executed this
Agreement as of the date first set forth above.


                                      Very truly yours,

                                      DIANON SYSTEMS, INC.

                                      By     /s/ Kevin C. Johnson
                                             -------------------------------
                                      Name:  Kevin C. Johnson
                                      Title: President and CEO


                                      JEFFREY L. SKLAR

                                      By     /s/ Jeffrey Sklar
                                             -------------------------------
                                             Jeffrey L. Sklar, MD




                                                                 Exhibit 10.45

                              SEPARATION AGREEMENT



         WHEREAS, VERNON L. WELLS and DIANON SYSTEMS, INC. ("COMPANY") wish to
end the employment relationship between them and wish to resolve any and all
claims, disputes or causes of action that do or may exist between them;

         NOW THEREFORE, in consideration of the mutual covenants and other
valuable considerations contained herein, the COMPANY and VERNON L. WELLS agree
as follows:

         1. VERNON L. WELLS resigns his full-time employment and his officer
position with the COMPANY effective as of January 27, 1998.

         2. The COMPANY shall pay VERNON L. WELLS separation pay, at his last
rate of base salary, subject to applicable deductions for the period beginning
with his resignation's effective date and ending on April 30, 1998 and for so
much of the period from April 30 through June 30, 1998 that VERNON L. WELLS has
not obtained other employment ("the Separation Period"). This separation pay
shall be paid in equal installments on the regular payroll dates of the COMPANY
throughout the separation period. VERNON L. WELLS shall advise the COMPANY's
President within five business days after accepting other employment and will
promptly thereafter submit written confirmation of his scheduled starting date
in such employment.


         3. Throughout the Separation Period, the COMPANY shall contribute to
medical coverage for VERNON L. WELLS and his dependents at the same rate it
contributes for active employees, provided VERNON L. WELLS and his family are
eligible for and elect continuation coverage.

         4. Throughout the Separation Period, the COMPANY shall provide life
insurance benefits for VERNON L. WELLS in the amount of $330,000. VERNON L.
WELLS will be responsible to accurately complete and forward to the Insurance
Carrier all required paperwork associated with his application for coverage in
the timeframe required by the Insurance Carrier, as well as, cooperate with any
requests for completion of medical tests and the submission of any additional
information that is required by the COMPANY and/or its Insurance Carrier.

         5. The COMPANY shall pay VERNON L. WELLS a $15,000 bonus for the first
quarter of 1998 on or before April 30, 1998.

         6. The COMPANY shall pay for VERNON L. WELLS to participate in Drake
Beam Morin, Inc.'s "Power Start" Program of outplacement services.

         7. VERNON L. WELLS agrees to comply with the provisions of the
non-competition and confidentiality agreement dated September 3, 1997 appended
to this Agreement as Exhibit A.

         8. No later than March 13, 1998, VERNON L. WELLS will return to the
COMPANY the XP Notebook, Pentium 200 double memory computer, 1 NI-MH battery and
1 Lithium battery which belong to the COMPANY. VERNON L. WELLS agrees that any
files containing COMPANY information are privileged and confidential and will
not be transferred into his personal computer files nor disclosed or in any way
made available to any Third Party without the written consent of the COMPANY.

         9. The Corporate American Express Card assigned to VERNON L. WELLS will
be kept active by the COMPANY during the Separation Period, provided that VERNON
L. WELLS meets his payment and other obligations as outlined in the Card Member
Agreement. Upon completion of the Separation Period, VERNON L. WELLS will return
the Corporate American Express Card to the COMPANY for cancellation. VERNON L.
WELLS will indemnify and hold harmless the COMPANY for any charges or other
payment obligations imposed on the COMPANY by American Express as a result of
use of the card after the termination of VERNON L. WELLS's employment with the
COMPANY.

<PAGE>
         10. VERNON L. WELLS agrees to cooperate with the COMPANY and its
representatives regarding any claims or potential claims or litigation by or
against the COMPANY involving matters about which VERNON L. WELLS possesses
knowledge.

         11 VERNON L. WELLS agrees to make himself reasonably available to
consult with the COMPANY on sales matters during the Separation Period.

         12. VERNON L. WELLS, on behalf of himself, his executors,
administrators and assigns, hereby releases the COMPANY, its affiliates and
their respective directors, officers, agents, employees, benefit plans,
fiduciaries and administrators of such benefit plans and their successors and
assigns (hereinafter "Released Parties") from any and all claims or causes of
action of any kind arising on or before the date he signs this Agreement, other
than vested rights under benefits plans, which VERNON L. WELLS has, had or may
have against any Released Party, whether or not now known, arising from VERNON
L. WELLS' recruitment for employment with the COMPANY, his employment or officer
position with the COMPANY, or the termination of his employment and officer
position with the COMPANY, including without limitation any claims for violation
of employment discrimination statutes, breach of contract, tort or other wrong
doing.

         13. VERNON L. WELLS, on behalf of himself, his heirs, executors,
administrators and assigns, further agrees never directly or indirectly to
commence or prosecute, or to permit or advise to be commenced or prosecuted, any
action, proceeding or charge against Released Party, in any state or federal
court, administrative agency or arbitral forum with respect to any matter
whether or not now known, for any claim based upon any acts transaction,
practice, conduct or omission that occurred prior to the date he signs this
Agreement, including but not limited to, rights under any federal, state or
local laws, prohibiting age, race, sex, national origin, religion or other forms
of discrimination, claims for breach of contract or promissory estoppel or tort
and claims growing out of any legal restrictions on the COMPANY's right to
terminate its employees or officers which he now has, or claims to have, or
which at any time heretofore he had, or which at any time hereafter he may have.

         14. VERNON L. WELLS agrees that he will not seek employment with the
COMPANY or its affiliates or successors and that any application he makes for
such employment will be rejected without explanation or recourse.

         15. The parties recognize and agree that this Agreement does not and
shall not constitute an admission of liability or wrongdoing by any Released
Party.

         16. The parties agree that, except as necessary to comply and to obtain
compliance with this Agreement, or to comply with any federal, state or local
law, they will not disclose the terms of this Agreement.

         17. In the event VERNON L. WELLS files a claim, law suit or complaint
against any Released Party in any court or governmental agency with respect to
the claims he has released under this Agreement, VERNON L. WELLS shall be liable
for all costs and expenses including legal fees incurred by any Released Party
in defense of that action.

         18. VERNON L. WELLS represents that he has carefully read and
completely understands this Agreement and that he has entered into this
Agreement voluntarily after having had a reasonable amount of time to consider
it and an opportunity to consult with his legal advisors.

         19. VERNON L. WELLS acknowledges that the commitments, waivers and
releases he gives in this Agreement are in exchange for valuable consideration
to which he is not otherwise entitled, and which constitutes a full accord and
satisfaction of any claims he may have against any Released Party.

         20. This Agreement constitutes the entire agreement of the parties on
the subject matter hereof and supersedes any and all prior agreements,
understandings or commitments, oral or written.

<PAGE>
         21. This Agreement shall be governed by applicable federal law and the
laws of the state of Connecticut.



VERNON L. WELLS                             DIANON SYSTEMS, INC.


/s/ Vernon L. Wells                         /s/ Kevin C. Johnson
- -------------------                         --------------------

Date:  March 19, 1998                       Date:  March 23, 1998
       --------------                              --------------




                                                                 Exhibit 23.3


                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS



As independent public accountants, we hereby consent to the incorporation by
reference of our report dated February 18, 1998, incorporated by reference in
DIANON Systems, Inc.'s Form 10-K for the year ended December 31, 1997, into the
previously file Registration Statements Nos. 33-41226, 33-94176, 33-94178,
33-43673 and 333-18817.



                                                    ARTHUR ANDERSEN LLP



Stamford, Connecticut
March 30, 1998






<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               DEC-31-1997
<CASH>                                          12,401
<SECURITIES>                                         0
<RECEIVABLES>                                   15,737
<ALLOWANCES>                                     1,292
<INVENTORY>                                        730
<CURRENT-ASSETS>                                29,122
<PP&E>                                          12,166
<DEPRECIATION>                                   6,058
<TOTAL-ASSETS>                                  36,889
<CURRENT-LIABILITIES>                            7,735
<BONDS>                                              0
                                0
                                          0
<COMMON>                                            68
<OTHER-SE>                                      28,978
<TOTAL-LIABILITY-AND-EQUITY>                    36,889
<SALES>                                         60,887
<TOTAL-REVENUES>                                60,887
<CGS>                                           31,122
<TOTAL-COSTS>                                   31,122
<OTHER-EXPENSES>                                24,578
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  27
<INCOME-PRETAX>                                  5,710
<INCOME-TAX>                                     2,413
<INCOME-CONTINUING>                              3,298
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     3,298
<EPS-PRIMARY>                                     0.51
<EPS-DILUTED>                                     0.48
        

</TABLE>


© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission