DIANON SYSTEMS INC
10-Q, 1997-11-14
MEDICAL LABORATORIES
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                       SECURITIES AND EXCHANGE COMMISSION

                              Washington, DC 20549
                                 ---------------

                                    FORM 10-Q


[X] QUARTERLY REPORT UNDER SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE
                                   ACT OF 1934

                For the Quarterly Period Ended September 30, 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 of incorporation)           (IRS Employer Identification No.)

        200 Watson Blvd, Stratford, CT                        06497
  (Address of principal executive offices)                 (zip code)

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

                                 NOT APPLICABLE
              (Former name, former address and former fiscal year,
                          if changed since last report)

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.

                                                                Yes X No_

The  number  of  shares  of the  registrant's  Common  Stock,  $.01  par  value,
outstanding on November 7, 1997 was 6,494,136 shares.

                      Exhibit Index on page 15 of 41 pages



<PAGE>

                              DIANON SYSTEMS, INC.
                                AND SUBSIDIARIES
                                      INDEX

<TABLE>
<CAPTION>

PART I FINANCIAL INFORMATION                                           PAGE NO.
- ----------------------------                                           --------

<S>       <C>                                                              <C>
Item 1.    FINANCIAL STATEMENTS

           Consolidated Balance Sheets as of
           September 30, 1997 and December 31, 1996.                       3

           Consolidated Statements of Operations for
           the three month and nine month periods ended
           September 30, 1997 and 1996.                                    4

           Consolidated Statements of Stockholders'
           Equity for the nine months ended
           September 30, 1997 and 1996.                                    5

           Consolidated Statements of Cash Flows for
           the nine months ended September 30, 1997 and 1996.              6

           Notes to Consolidated Financial Statements.                     7

Item 2.    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
           FINANCIAL CONDITION AND RESULTS OF OPERATIONS                   8-12


PART II  OTHER INFORMATION
- --------------------------

Item 6.    EXHIBITS AND REPORTS ON  FORM 8-K                               13

Signatures                                                                 14

Exhibit Index                                                              15

</TABLE>


<PAGE>


                              DIANON SYSTEMS, INC.
                           CONSOLIDATED BALANCE SHEETS

<TABLE>
<CAPTION>
                                                                                     SEPT. 30,     DECEMBER 31,
                                                                                       1997            1996
                                                                                  -----------------------------
                                                                                   (UNAUDITED)
                                    ASSETS
CURRENT ASSETS:
     <S>                                                                          <C>             <C>         
     Cash and cash equivalents                                                    $ 11,150,602    $  7,488,590
     Accounts receivable, net of allowances of $1,085,076 and
        $1,056,920, respectively                                                    14,506,148      15,426,221
     Prepaid expenses and employee advances                                          1,069,257       1,189,139
     Prepaid and refundable income taxes                                               150,233         329,371
     Inventory                                                                         765,544         662,567
     Deferred income tax asset                                                         677,277         677,277
                                                                                  -----------------------------
        Total current assets                                                        28,319,061      25,773,165
                                                                                  -----------------------------
PROPERTY AND EQUIPMENT, at cost
     Laboratory and office equipment                                                13,244,119      12,233,989
     Leasehold improvements                                                          3,832,539       3,612,198
        Less - accumulated depreciation and amortization                           (10,364,768)     (8,606,176)
                                                                                  -----------------------------
                                                                                     6,711,890       7,240,011
                                                                                  -----------------------------

INTANGIBLE ASSETS, net of accumulated amortization of
        $3,153,499 and $2,991,286, respectively                                        442,100         604,131
DEFERRED INCOME TAX ASSET                                                              458,465         458,465
OTHER ASSETS                                                                           327,443         459,696
                                                                                  =============================
        TOTAL ASSETS                                                              $ 36,258,959    $ 34,535,650
                                                                                  =============================

                  LIABILITIES AND STOCKHOLDERS' EQUITY
CURRENT LIABILITIES:
     Accounts payable                                                             $    808,720    $  2,123,661
     Accrued employee bonuses, commissions and payroll                               2,022,468       1,504,430
     Accrued employee stock purchase plan                                              963,309         549,540
     Current portion of capitalized lease obligations                                   40,854          26,107
     Current portion of note payable                                                        --         650,154
     Other accrued expenses                                                          4,640,465       2,861,268
                                                                                  -----------------------------
        Total current liabilities                                                    8,475,816       7,715,160
                                                                                  -----------------------------
LONG-TERM PORTION OF CAPITALIZED LEASE OBLIGATIONS                                     115,876          69,611
DEFERRED INCOME TAX LIABILITY                                                          201,951         201,951
                                                                                  -----------------------------
        Total liabilities                                                            8,793,643       7,986,722
                                                                                  -----------------------------
STOCKHOLDERS' EQUITY
     Common  stock,  par value  $.01 per share, 20,000,000 shares
        authorized, 6,782,894 and 6,712,774  shares issued and
        outstanding at September 30, 1997 and December 31, 1996,
        respectively                                                                    67,829          67,128
     Additional paid-in capital                                                     28,270,841      27,965,560
     Accumulated earnings/(deficit)                                                  1,714,347        (554,317)
     Common stock held in treasury, at cost - 310,814 and 117,196
        shares at September 30, 1997 and December 31, 1996, respectively            (2,587,701)       (929,443)
                                                                                  -----------------------------
        Total stockholders' equity                                                  27,465,316      26,548,928
                                                                                  =============================
        TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY                                $ 36,258,959    $ 34,535,650
                                                                                  =============================
                                         The accompanying notes to consolidated financial
                                     statements are an integral part of these balance sheets.

</TABLE>



<PAGE>

<TABLE>
<CAPTION>

                                       DIANON SYSTEMS, INC.
                                CONSOLIDATED STATEMENTS OF OPERATIONS
                         FOR THE THREE MONTH AND NINE MONTH PERIODS ENDED
                                   SEPTEMBER 30, 1997 AND 1996
                                             (UNAUDITED)






                                                                         THREE MONTHS ENDED                    NINE MONTHS ENDED
                                                                            SEPTEMBER 30,                         SEPTEMBER 30,
                                                                      1997               1996               1997              1996
                                                               ---------------------------------------------------------------------
<S>                                                              <C>                  <C>               <C>              <C>        
NET REVENUES                                                     $14,512,373          $13,863,408       $46,169,947      $39,956,557

COST OF GOODS                                                      7,621,207            6,799,712        23,376,222       19,419,522
                                                               ---------------------------------------------------------------------
     Gross Profit                                                  6,891,166            7,063,696        22,793,725       20,537,035

SELLING, GENERAL AND
  ADMINISTRATIVE EXPENSES                                          5,224,120            5,222,176        17,822,103       15,891,036
RESEARCH & DEVELOPMENT
  EXPENSES                                                           381,681              722,157         1,350,246        2,304,239
                                                               ---------------------------------------------------------------------

     Income from Operations                                        1,285,365            1,119,363         3,621,376        2,341,760

INTEREST INCOME                                                      158,622               50,573           382,749          280,365

INTEREST EXPENSE                                                       5,192               18,038            24,013           62,779
                                                               ---------------------------------------------------------------------

     Income Before Provision for Income Taxes                      1,438,795            1,151,898         3,980,112        2,559,346

PROVISION FOR INCOME TAXES                                           618,682              495,316         1,711,448        1,100,519
                                                               ---------------------------------------------------------------------

   Net Income                                                     $  820,113           $  656,582       $ 2,268,664      $ 1,458,827
                                                               =====================================================================

Weighted Average Shares Outstanding                                6,835,636            6,295,106         6,844,341        6,228,925
                                                               ---------------------------------------------------------------------

Primary and Fully Diluted Earnings Per Share                           $0.12                $0.10             $0.33            $0.23
                                                               =====================================================================


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

</TABLE>




<PAGE>


<TABLE>
<CAPTION>

                                                                 DIANON SYSTEMS, INC.
                                                    CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
                                                 FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997 AND 1996
                                                                      (UNAUDITED)



                                                                                Common Stock  Common Stock
                                                                     Additional Acquired for  Acquired for  Shareholder
                                    Common Stock        Paid-In      Earnings/   Treasury,     Treasury,       Note
                                 Shares       Amount    Capital      (Deficit)    Shares        at Cost      Receivable    Total
                                ----------------------------------------------------------------------------------------------------
<S>                              <C>         <C>        <C>          <C>          <C>         <C>         <C>         <C> 
BALANCE, December 31, 1995       6,311,451    $63,115   $26,609,657  ($2,724,433)  (50,000)  ($ 200,000)  ($296,000)  $23,452,339
  Stock options exercised           12,847        128        58,454           --        --           --         --        58,582
  Common stock acquired for 
     treasury                           --         --            --           --  (371,000)  (2,083,078)        --    (2,083,078)
  Net Income                            --         --            --    1,458,827       --           --          --     1,458,827
                                ====================================================================================================
BALANCE, September 30, 1996      6,324,298    $63,243   $26,668,111  ($1,265,606) (421,000) ($2,283,078) ($296,000)  $22,886,670
                                ====================================================================================================

BALANCE, December 31, 1996       6,712,774    $67,128   $27,965,560  ($  554,317) (117,196) ($  929,443)   $    --   $26,548,928
  Stock options exercised           44,503        445       212,011           --        --           --         --       212,456
  Employee stock purchase plan
     options exercised                  --         --      (127,753)          --    33,382      277,772         --       150,019
     Stock grants                   25,617        256       221,023           --       --           --          --       221,279
     Common stock acquired for
       treasury                         --         --            --           --  (227,000)  (1,936,030)        --    (1,936,030)
     Net Income                         --         --            --    2,268,66        --           --          --     2,268,664
                                ====================================================================================================
BALANCE, September 30, 1997      6,782,894    $67,829   $28,270,841   $1,714,347  (310,814) ($2,587,701)   $    --   $27,465,316
                                ====================================================================================================



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

</TABLE>





<PAGE>



<TABLE>
<CAPTION>



                                                  DIANON SYSTEMS, INC.
                                          CONSOLIDATED STATEMENTS OF CASH FLOWS
                                  FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997 AND 1996
                                                       (UNAUDITED)



                                                                                                     SEPTEMBER 30,
                                                                                            -------------------------------
        CASH FLOWS FROM OPERATING ACTIVITIES:                                                    1997               1996
                                                                                            -------------------------------
        <S>                                                                                  <C>                <C>       
            Net income                                                                       $ 2,268,664        $1,458,827
        Adjustments to reconcile net income to net
            cash provided by (used in) operations -
             Non-cash charges
                 Depreciation and amortization                                                 2,216,659         1,690,047
                 Stock compensation expense                                                      221,279                --
                 Loss on the disposal of fixed assets                                             40,914            19,337
                 Investment write-down                                                                --            61,846
        Changes in other current assets and liabilities
             Decrease (increase) in accounts receivable                                          920,073        (2,836,940)
             Decrease (increase) in prepaid expenses and
                 employee advances                                                               299,020          (322,668)
             (Increase) in inventory                                                            (102,977)          (79,296)
             Decrease (increase) in other assets                                                 112,361            (3,788)
             Increase in accounts payable and accrued liabilities                              1,433,843           884,617
                                                                                            -------------------------------
                           Net cash provided by operating activities                           7,409,836           871,982
                                                                                            -------------------------------

        CASH FLOWS FROM INVESTING ACTIVITIES:
             Capital expenditures                                                             (1,650,368)       (3,315,215)
             Proceeds from the sale of stock held for investment                                   9,064            73,661
             Proceeds from the disposal of fixed assets                                               --            7,500
                                                                                            -------------------------------
             Net cash (used in) investing activities                                          (1,641,304)       (3,234,054)
                                                                                            -------------------------------

        CASH FLOWS FROM FINANCING ACTIVITIES:
             Repayments of note payable                                                         (650,154)         (681,790)
             Borrowings (repayments) of capitalized lease obligations, net                       117,189            39,406
             Purchase of common stock acquired for treasury                                   (1,936,030)       (2,083,078)
             Stock options exercised                                                             212,456            58,582
             Employee stock purchase plan options exercised                                      150,019                --
                                                                                            -------------------------------
                         Net cash (used in) financing activities                              (2,106,520)       (2,666,880)
                                                                                            -------------------------------
                         Net increase (decrease) in cash and cash equivalents                  3,662,012        (5,028,952)

        CASH AND CASH EQUIVALENTS, beginning of period                                          7,488,590       10,990,231
                                                                                            -------------------------------
        CASH AND CASH EQUIVALENTS, end of period                                              $11,150,602       $5,961,279
                                                                                            ===============================

        Supplemental cash flow disclosures:
        Cash paid during the period:
                 Interest                                                                         $24,795           $63,174
                 Income Taxes                                                                   1,475,089         1,299,005


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

</TABLE>



<PAGE>

                              DIANON SYSTEMS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.   THE COMPANY - The consolidated  balance sheet as of September 30, 1997, the
     related consolidated  statements of operations for the three and nine month
     periods  ended  September  30,  1997 and  1996,  the  related  consolidated
     statements  of cash flow for the nine months ended  September  30, 1997 and
     1996, and the related  consolidated  statements of stockholders' equity for
     the nine months  ended  September  30, 1997 and 1996 have been  prepared by
     DIANON  Systems,  Inc. (the  "Company")  without  audit.  In the opinion of
     management,  all  adjustments  necessary  to present  fairly the  financial
     position,  results of  operations  and cash flows at September 30, 1997 and
     1996 have been made. During the interim periods reported on, the accounting
     policies  followed are in conformity  with  generally  accepted  accounting
     principles  and are  consistent  with those applied for annual  periods and
     described  in the  Company's  annual  report  filed on Form  10-K  with the
     Securities and Exchange Commission on March 31, 1997 (the "Annual Report").

     Certain information and footnote disclosures normally included in financial
     statements  prepared  in  accordance  with  generally  accepted  accounting
     principles  have been  omitted.  It is  suggested  that these  consolidated
     financial  statements be read in conjunction with the financial  statements
     included in the  Company's  Annual  Report for the year ended  December 31,
     1996.  The results of operations  for the nine months ending  September 30,
     1997 and 1996 are not necessarily  indicative of the operating  results for
     the full years.

2.   DESCRIPTIVE  ANALYSIS - The descriptive  analysis contained herein compares
     the financial results of the first nine months, and the three months, ended
     September 30 for the years 1997 and 1996. To accommodate  the comparison of
     pertinent financial  information the following terms will be used to denote
     the respective periods:

     "First Nine Months 1997" - nine months ended September 30, 1997 "First Nine
     Months 1996" - nine months ended September 30, 1996

     "Third Quarter 1997" - three months ended September 30, 1997 "Third Quarter
     1996" - three months ended September 30, 1996

3.   IMPACT OF  ACCOUNTING  PRONOUNCEMENTS,  NOT YET  ADOPTED  BY THE  COMPANY -
     Earnings Per Share  ("EPS"):  In February  1997,  the Financial  Accounting
     Standards  Board issued SFAS No. 128,  "Earnings Per Share," which requires
     public  companies  to present  basic EPS and, if  applicable,  diluted EPS,
     instead of primary and diluted EPS. Basic EPS is calculated by dividing the
     net income by the weighted  average  number of shares  outstanding  for the
     period, without consideration for common stock equivalents.  Diluted EPS is
     computed similarly to fully diluted EPS under the provisions of APB Opinion
     No. 15.  Revision of the EPS standard had two  objectives - to simplify the
     EPS  calculation  and to make the EPS  standard  applicable  to US entities
     comparable to the standard of most other countries and to the international
     standard,  which was also recently  revised.  SFAS No. 128 is effective for
     financial statements issued for periods ending after December 15, 1997. The
     Company's  basic  and  diluted  EPS  (which  are not yet  reflected  in the
     consolidated  financial  statements included herein because the Company has
     not yet adopted SFAS No. 128) are stated below:

<TABLE>
<CAPTION>
                      Three Months   Three Months    Nine Months    Nine Months
                         Ended          Ended          Ended           Ended
                      September 30,  September 30,  September 30,  September 30,
                          1997            1996           1997          1996
                          ----            ----           ----          ----
<S>                      <C>             <C>            <C>            <C> 
        Basic EPS        $0.13           $0.11          $0.35          $.25
        Diluted EPS      $0.12           $0.10          $0.33          $.23

</TABLE>





<PAGE>


                MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
                       CONDITION AND RESULTS OF OPERATIONS
                  NINE MONTHS ENDED SEPTEMBER 30, 1997 AND 1996
                                   (UNAUDITED)


RESULTS OF OPERATIONS
- ---------------------

      O    NET REVENUES

Net revenues were $46.2  million  during the First Nine Months 1997, an increase
of $6.2 million or 16% from the First Nine Months 1996.  Increased revenues were
attributable to increased market penetration by the Company's anatomic pathology
testing  services.  The increase in anatomic  pathology  testing services in the
First Nine  Months  1997 over the  comparable  period of 1996 was offset to some
extent by a decline in reimbursements in clinical chemistry and esoteric testing
services.

Net revenues  were $14.5  million  during the Third Quarter 1997, an increase of
$649,000 or 5% from the Third Quarter 1996. Increased revenues were attributable
to increased  market  penetration by the Company's  anatomic  pathology  testing
services.

      O    COST OF GOODS

Cost of goods,  which  consists  primarily  of  salaries  and wages,  laboratory
supplies,  outside services,  logistics  (primarily shipping and handling),  and
depreciation  expense,  was $23.4 million  during the First Nine Months 1997, an
increase of $4.0  million or 20% from the First Nine Months  1996.  Salaries and
wages were $8.0  million in the First Nine  Months  1997,  an  increase  of $1.9
million or 30% from the First Nine Months 1996.  This  increase was  principally
due to  increased  laboratory  and  physician  employment  incurred  to  support
increased  anatomic  pathology testing services.  Laboratory  supplies were $4.1
million  for the First  Nine  Months  ended 1997 and 1996.  Laboratory  supplies
decreased  to 8.9% of net  revenues  in the First Nine Months 1997 from 10.2% in
the First Nine Months 1996.  This decrease was the result of cost  efficiencies.
Logistics  were $4.5 million in the First Nine Months 1997,  an increase of $1.5
million or 48% from the First Nine Months 1996.  The increase in logistic  costs
was principally due to supporting new anatomic pathology testing services.  As a
percentage of net revenues, cost of goods increased to 51% during the First Nine
Months 1997 from 49% during the First Nine Months 1996.

Cost of goods was $7.6 million  during the Third  Quarter  1997,  an increase of
$821,000 or 12% from the Third  Quarter  1996.  As a percentage of net revenues,
cost of goods  increased to 53% in the Third  Quarter 1997 from 49% in the Third
Quarter 1996.

      O    GROSS PROFIT

Gross profits were $22.8 million  during the First Nine Months 1997, an increase
of $2.3  million or 11% from the First Nine Months  1996.  The  Company's  gross
profit  margin  decreased  to 49% in the First Nine  Months 1997 from 51% in the
First Nine  Months  1996.  The  decrease in gross  profit  margin was due to the
continued  erosion of the average  unit price  reimbursed  for certain  clinical
chemistry and esoteric  testing  services and the higher costs  associated  with
providing anatomic pathology testing services.

Gross  profits were $6.9 million  during the Third  Quarter  1997, a decrease of
$173,000 or 2% from the Third  Quarter 1996.  The Company's  gross profit margin
decreased to 47% in the Third  Quarter 1997 from 51% in the Third  Quarter 1996.
The  decrease  in  gross  profit  margin  was  partly  due  to  the  decline  in
reimbursements  for certain clinical chemistry and esoteric testing services and
the higher costs associated with providing anatomic pathology testing services.


<PAGE>

The clinical  laboratory  industry,  which includes both clinical  chemistry and
anatomic pathology,  has seen steady downward pressure on prices exerted by both
government and private third party payors. A reduction in  reimbursement  rates,
particularly  by Medicare,  has  generally  decreased the average unit price for
most of the  Company's  clinical  chemistry  services each year. In keeping with
this trend,  as part of the  Omnibus  Budget  Reconciliation  Act of 1993 ("OBRA
`93"),  Congress  reduced over time the national cap on Medicare  laboratory fee
schedules.  This  national  cap has been lowered each year and is now 76% of the
national  median.  Under  the  provisions  of the  Balanced  Budget  Act of 1997
("BBA"),  the cap would be lowered  further to 74%  beginning in 1998.  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 terms of the BBA would  freeze fee  schedule  payments for the 1998 -
2002 period.

In addition,  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.  In some
cases,  government  payors  such as  Medicare  also may seek to recoup  payments
previously made for services determined not to be reimbursable.  Any such action
by payors would have an adverse affect on the Company's revenue and earnings.

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.

With respect to the Company's  tissue  testing  services,  which are  reimbursed
under the  physician  fee  schedules  rather than the  Medicare  laboratory  fee
schedules, the Medicare fees for these services also generally declined with the
implementation of the resource based relative value scale ("RBRVS") system which
went  into  effect  in 1992 and was  fully  phased  in by the end of  1996.  The
Medicare RBRVS payment for each service is calculated by  multiplying  the total
relative  value units  ("RVUs")  established  for the  services by a  conversion
factor that is set by law.  The number of RVUs  assigned  to each  service is in
turn calculated by adding three separate components,  including one representing
the  relative  work  values.  Although the  conversion  factor for  non-surgical
services,  including  pathology,  is  currently  $33.8454,  the BBA  includes  a
provision  that merges the three  existing  conversion  factors into one for all
types of services  provided.  This single factor will be $36.69 - an increase of
8.3% over the 1997 conversion factor applicable to pathology services.

There was an overall decrease of 5.7% between 1996 and 1997 in payments per RVUs
for pathology  services,  plus an additional  decrease in Connecticut due to the
Health  Care  Financing  Administration's  ("HCFA")  reduction  of the number of
different payment localities  recognized for RBRVS purposes. At the beginning of
1997, HCFA published  proposed  regulations which recalculate a key component of
the RBRVS fee schedule.  This  recalculation  would modify 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 this modification to reflect  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 - 2002. In addition,  disclosure and  evaluation of the  methodology
used by HCFA to  support  its  proposal  will be  required.  In the past,  RBRVS
program  implementation  and modification has had the effect of reducing prices,
and thus the gross profit, of the Company.  Overall, the Company does not expect
projected future RBRVS adjustments to change this trend.

Other changes in government and other third-party payor  reimbursement which may
come about as a  consequence  of the enactment of current and future health care
reform or  deficit  reduction  measures  are  likely to  continue  the  downward
pressure on prices and make the market for  clinical  laboratory  services  more
competitive.


<PAGE>



For example,  the BBA would revise the Medicare program  substantially to permit
beneficiaries to choose between traditional  fee-for-service Medicare as well as
several  non-traditional  Medicare  options,  including  managed  care plans and
provider-sponsored  organization  plans.  These  non-traditional  Medicare plans
would have considerable  discretion in determining  whether and how to cover and
reimburse  laboratory  services and also have  discretion 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.  If later  adopted on a widespread  basis,  these
changes likely would have an adverse impact on the Company's revenues,  and thus
on its gross profit.

In addition, 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, and the use of global payments
and flexible  purchasing.  Although the details of these  measures are yet to be
finalized,  they probably would  increase  pressure on pricing in the laboratory
industry and may have an adverse impact on the Company's revenues.

Finally,  in recent months the federal  government has become more aggressive in
examining billing by laboratories, and in seeking repayments and even penalties,
based on how services were billed (e.g., the billing codes used),  regardless of
whether carriers had furnished clear guidance on this subject. The primary focus
of this initiative has been on hospital  laboratories,  and on routine  clinical
chemistry tests which provide only a small part of the Company's revenues. While
it is possible that this initiative could expand,  it is not possible to predict
whether  or in what  direction  this  might  occur.  The  Company  believes  its
practices  differ  materially  from  those  now  being  examined.   However,  no
assurances can be given that the  government  will not broaden its initiative to
focus on the type of  services  furnished  by the  Company  or,  if this were to
happen, on how much money, if any, the Company might have to pay.

Because of the uncertainties  about how the Medicare  developments such as those
described above will be implemented,  the Company currently is unable to predict
their ultimate impact on the laboratory  industry generally or on the Company in
particular.  Reforms  may also occur at the state  level as well as the  federal
level and, in addition,  changes are occurring in the marketplace as a result of
market pressures, as the number of patients covered by some form of managed care
is increasing.  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, more favorable  purchase  contracts and greater  operational
efficiencies. However, if price decreases (for example arising from the proposed
Medicare  changes  discussed  above) or coverage  changes were to be rapidly and
fully implemented,  or if the government were to seek any substantial repayments
or penalties  from the  Company,  such  developments  would be likely to have an
adverse  impact on gross  profits from the  Company's  testing  services  unless
management had an opportunity to mitigate such impact.

      O    SELLING, GENERAL AND ADMINISTRATIVE EXPENSES

Selling, general and administrative expenses were $17.8 million during the First
Nine Months 1997,  an increase of $1.9 million or 12% from the First Nine Months
1996.  As a percentage  of net  revenues,  selling,  general and  administrative
expenses  decreased  to 39% in the First Nine  Months 1997 from 40% in the First
Nine Months 1996.

Selling,  general and administrative expenses were $5.2 million during the Third
Quarter  1997 and the Third  Quarter  1996.  As a  percentage  of net  revenues,
selling,  general  and  administrative  expenses  decreased  to 36% in the Third
Quarter 1997 from 38% in the Third Quarter 1996.

Severance costs of approximately $259,000 were recorded in the First Nine Months
1997 compared with  $148,000  recorded in the First Nine Months 1996.  Severance
costs of approximately $100,000 were recorded in the Third Quarter 1997 compared
with $102,000 recorded in the Third Quarter 1996.


<PAGE>


Investment write-downs of $62,000 were recorded in the First Nine Months 1996 to
write-down the investment,  held on the Company's balance sheet, in common stock
of a publicly  traded  company  to market  value as the loss in value was deemed
other than  temporary in accordance  with the Statement of Financial  Accounting
Standard  115,   "Accounting   for  Certain   Investments  on  Debt  and  Equity
Securities". No similar charges were recorded in the First Nine Months 1997. The
Company sold its remaining shares in the first quarter of 1997.

      O    RESEARCH AND DEVELOPMENT

Research  and  development  expenses  were $1.4 million in the First Nine Months
1997,  a decrease of $954,000 or 41% from the First Nine Months  1996.  Research
and development expenses include the costs of the review,  analysis and clinical
evaluation  of new  technologies.  This decrease in 1997 is primarily due to the
completion  in  1996  of the  major  one-time  expenditures  necessary  for  the
development of the new anatomic pathology services.

Research and  development  expenses  were  $382,000 in the Third Quarter 1997, a
decrease of $340,000 or 47% from the Third Quarter 1996.

      O    INTEREST INCOME

The  Company's  interest  income was $383,000 for the First Nine Months 1997, an
increase of $102,000 or 37% from the First Nine Months 1996. Interest income for
the First Nine Months 1997 was earned on an average  investment  of $9.4 million
compared  with $8.3 million in the First Nine Months 1996.  Interest  income was
$159,000 for the Third  Quarter  1997,  an increase of $108,000 or 214% from the
Third Quarter 1996.  Interest income for the Third Quarter 1997 was earned on an
average  investment  of $11.0  million  compared  with $5.4 million in the Third
Quarter 1996.

      O    INTEREST EXPENSE

Interest  expense  was $24,000  for the First Nine  Months  1997,  a decrease of
$39,000 or 62% from the First Nine Months 1996. The decrease in interest expense
was due to the on-going  pay-down of the $3.5 million term loan obtained in July
of 1993 which bears interest at 6% per year. Interest expense was $5,000 for the
Third Quarter 1997, a decrease of $13,000 or 71% from the Third Quarter 1996. As
of the end of the Third  Quarter  1997 this term loan has been  completely  paid
off.

      O    PROVISION FOR INCOME TAXES

Provision  for income tax  expense  was $1.7  million  for the First Nine Months
1997,  an  increase of  $611,000  or 56% from the First Nine  Months  1996.  The
effective  tax rate was 43%  during  both the First Nine  Months  1997 and 1996.
Provision  for income tax expense was $619,000 for the Third  Quarter  1997,  an
increase of $123,000 or 25% from the Third Quarter 1996.  The effective tax rate
was 43% during both the Third Quarter 1997 and 1996.

      O    NET INCOME

As a result of the  foregoing,  net income was $2.3  million  for the First Nine
Months 1997, an increase of $810,000 or 56% from the First Nine Months 1996. Net
income was $820,000  during the Third  Quarter  1997, an increase of $164,000 or
25% from the Third Quarter 1996.

LIQUIDITY AND CAPITAL RESOURCES
- -------------------------------

As of September  30, 1997,  the Company had total cash and cash  equivalents  of
approximately  $11.2  million of which  $10.5  million  was  invested  in a fund
holding U. S. Treasury securities with maturities of less than three months.

The Company had working  capital of $19.8 million at September 30, 1997 compared
to $18.1 million at December 31, 1996, and the working  capital ratio was 3.3 to
1 at September 30, 1997 compared to 3.4 to 1 at December 31, 1996.


<PAGE>


Domestic trade receivables,  net, were $14.5 million as of September 30, 1997, a
decrease of $713,000 or 5% from  December 31, 1996.  The average  number of days
sales has  decreased  from 94 days for the month of December 1996 to 92 days for
the month of September 1997.

Capital  expenditures  during the First Nine Months 1997 were approximately $1.7
million compared to $3.3 million for the First Nine Months 1996.

As of September  30, 1997,  the Company had in its  treasury  310,814  shares of
Common Stock allocated for the Company's Employee Stock Purchase Plan at a total
cost of $2.6 million.  The Company plans to continue to repurchase  shares under
its previously authorized buyback program.

The Company  believes that cash flows from  operations as well as 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  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;  the  possibility of being deemed to be not in compliance
with federal or state regulatory requirements; 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  health  care
delivery;  the  uncertainties  relating  to  states  erecting  barriers  to  the
performance  of  anatomic   national   laboratories;   competition   from  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.


<PAGE>



PART II OTHER INFORMATION


Item 6      EXHIBITS AND REPORTS ON FORM 8-K
            
<TABLE>
<CAPTION>

a       Exhibits

<S>      <C>    
(3.3)    Restated  By-Laws of the Company,  as amended  through February 2, 1997
         (filed herewith).

(10.42)  Non-Compete  Agreement  dated September 3, 1997, by  the Registrant and
         Vernon L. Wells (filed herewith).

(10.43)  Severance  Agreement  dated  September 15, 1997, by  the Registrant and
         Robert C. Verfurth (filed herewith).

(11.1)   Statement regarding  computation of per  share earnings is not required
         because  the relevant  computation  can be determined from the material
         contained in the Financial Statements included herein.

(27.1)   Financial Data Schedule (filed herewith).

  b     Report on Form 8-K. No reports on Form 8-K were filed during the quarter
        ended September 30, 1997.

</TABLE>






<PAGE>

Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.


                                          DIANON Systems, Inc.



                      November 13, 1997   /S/ KEVIN C. JOHNSON
                                          --------------------
                                      By: Kevin C. Johnson
                                          President and
                                          Chief Executive Officer
                                          (Principal Executive Officer)





                      November 13, 1997  /S/ DAVID R. SCHREIBER
                                         ----------------------
                                         By: David R. Schreiber
                                             Senior Vice President, Finance and
                                             Chief Financial Officer
                                             (Principal Financial and
                                             Accounting Officer)




<PAGE>



                                  EXHIBIT INDEX


<TABLE>
<CAPTION>
                                                                                                                   PAGE NO.
                                                                                                                   --------
<S>          <C>                                                                                                     <C> 
(3.3)        Restated By-Laws of the Company, as amended through February 2, 1997 (filed herewith).                   16

(10.42)      Non-Compete Agreement dated September 3, 1997, by the Registrant and Vernon L. Wells                     31
             (filed herewith).

(10.43)      Severance Agreement dated September 15, 1997, by the Registrant and Robert C. Verfurth (filed            34
             herewith).

(27.1)       Financial Data Schedule (filed herewith).                                                                41


</TABLE>







                                     BY-LAWS

                                       OF

                              DIANON SYSTEMS, INC.
                            (A DELAWARE CORPORATION)

                                    ARTICLE I

                                  STOCKHOLDERS

         Section 1.01 ANNUAL  MEETING.  The annual meeting of the  stockholders,
for the purpose of electing directors and transacting such other business as may
come  before it,  shall be held on such date and at such time and place,  either
within or without the State of  Delaware,  as may be  specified  by the Board of
Directors.

         Section 1.02 SPECIAL MEETINGS. Special meetings of the stockholders may
be called only by the  Chairman of the Board,  the  President or by the Board of
Directors.  At a special  meeting  of the  stockholders,  no  business  shall be
transacted  which is not related to the purpose or purposes stated in the notice
of meeting.

         Any special meeting of the stockholders  shall be held on such date and
at such time and place,  either within or without the State of Delaware,  as may
be specified  by the person or persons  calling the meeting in the notice of the
meeting.

         Section 1.03 NOTICE OF MEETINGS.  Written notice of each  stockholders'
meeting,  stating the place,  date and hour of the meeting  and,  the purpose or
purposes  thereof,  shall be given to each  stockholder  entitled to vote at the
meeting  not less  than ten nor more  than  sixty  days  before  the date of the
meeting. Any previously scheduled meeting of the stockholders may be canceled by

<PAGE>


resolution of the Board of Directors  upon public notice given prior to the date
previously scheduled for such meeting.

         Section 1.04 QUORUM;  ADJOURNMENT.  Except as otherwise provided in the
Restated  Certificate of Incorporation or required by law, at any meeting of the
stockholders  a majority of the shares  entitled  to vote,  present in person or
represented by proxy,  shall constitute a quorum.

         The  Chairman of the meeting or the vote of a majority of the shares so
represented  may adjourn the meeting from time to time,  whether or not there is
such a quorum.  No notice of the time and place of  adjourned  meetings  need be
given except as required by law.

         Section 1.05 CONDUCT OF MEETINGS.  The chief  executive  officer  shall
preside at any meeting of the stockholders. In such person's absence, such other
person as shall have been designated by the chief executive officer or the Board
of Directors  shall  preside.  The order of business at any meeting  shall be as
determined by such Presiding Officer. 

         The  presiding  officer  shall have the power to prescribe  such rules,
regulations  and  procedures and to do all such things as in his judgment may be
necessary or desirable for the proper conduct of the meeting, including, without
limitation,  the  establishment  of procedures for the  maintenance of order and
safety, limitations on the time allotted to questions or comments,  restrictions
on entry to the meeting after the time  scheduled for the  commencement  thereof
and the opening and closing of the voting polls.

         If present,  the Secretary shall act as secretary of any meeting of the
stockholders.  In the  Secretary's  absence,  such other person as the presiding
officer shall designate  shall act as secretary of the meeting.  


<PAGE>


         It shall be the duty of the Secretary to prepare and make, at least ten
days  before  every  meeting  of  the  stockholders,  a  complete  list  of  the
stockholders entitled to vote at the meeting, arranged in alphabetical order and
showing the address of each  stockholder and the number of shares  registered in
the name of each stockholder.  Such list shall be open to the examination of any
stockholder,  for any purpose germane to the meeting,  during ordinary  business
hours, for a period of at least ten days prior to the meeting, either at a place
within the city where the meeting is to be held,  which place shall be specified
in the notice of the meeting,  or, if not so  specified,  at the place where the
meeting is to be held.  The list shall also be produced and kept at the time and
place of the meeting during the whole time thereof,  and may be inspected by any
stockholder who is present.

         Section  1.06  VOTING.   Except  as  otherwise   provided  in  Restated
Certificate  of  Incorporation  or required by law,  (i) every holder of capital
stock  which is entitled to vote shall be entitled to one vote for each share of
such stock registered in the name of such  stockholder,  (ii) directors shall be
elected by a plurality  of the votes  validly cast at the meeting by the holders
of shares  entitled to vote for the  election of  directors  and (iii) any other
corporate action shall be authorized if, with respect to shares entitled to vote
on the action,  the votes  validly cast in favor of the action  exceed the votes
validly cast in  opposition  to the action.

         Section  1.07  RECORD  DATE.  For  the  purpose  of   determining   the
stockholders entitled to notice of or to vote at any meeting of the stockholders
or any  adjournment  thereof,  or entitled to receive payment of any dividend or
other  distribution  or  allotment  of any rights,  or entitled to exercise  any
rights in respect of any  change,  conversion  or  exchange  of stock or for the
purpose of any other lawful action,  the Board of Directors may fix, in advance,

<PAGE>


a record date,  which shall not be more than sixty nor less than ten days before
the date of such  meeting,  nor more than sixty days prior to any other  action.


         Section 1.08. NOMINATION OF DIRECTORS. Subject to the rights of holders
of any outstanding preferred stock, only persons who are nominated in accordance
with the following procedures shall be eligible for election as directors of the
Corporation.  Nominations  for  election of  directors  may be made at an annual
meeting of  stockholders  either by the Board of Directors or by any stockholder
who is a  stockholder  on the date of the giving of the notice  provided  for in
this Section 1.08 and on the record date for the  determination  of stockholders
entitled to vote at such annual  meeting.  An eligible  stockholder may nominate
persons for election as directors at an annual meeting of  stockholders  only if
such  stockholder  has caused proper written  notice with respect  thereto to be
delivered to, or mailed and received at, the principal  executive offices of the
Corporation  not more than 120 days nor less  than 90 days  prior to the date of
the  annual  meeting;  provided,  however,  that in the event that less than 100
days' notice or prior public  disclosure  of the date of the meeting is given to
stockholders,  such  written  notice  will also be timely if so  received by the
close of business on the 10th day  following  the first to occur of (y) the date
on which  such  notice of the date of the annual  meeting  was mailed or (z) the
date on which  public  disclosure  of such date was made.  For such notice by an
eligible stockholder to be proper, such notice shall set forth: (i) the name and
business and  residential  addresses of the  stockholder who intends to make the
nomination  and of the  person or  persons  to be  nominated;  (ii) the class or
series and number of shares of capital stock of the  Corporation  that are owned
beneficially or of record by such stockholder;  (iii) a representation that such
stockholder intends to appear in person or by proxy as a holder of record at the
meeting to  nominate  the  person or persons  specified  in the  notice;  (iv) a
description of all arrangements or  understandings  between such stockholder and

<PAGE>


each  nominee  proposed  by the  stockholder  and any other  person  or  persons
(identifying  such  person  or  persons)  pursuant  to which the  nomination  or
nominations are to be made by the stockholder;  (v) the principal  occupation or
employment  of, and the classes or series and number of shares of capital  stock
of the  Corporation  that are owned  beneficially or of record by, the person or
persons  to be  nominated  and such other  information  regarding  each  nominee
proposed  by such  stockholder  as would be  required  to be included in a proxy
statement  filed  pursuant to the proxy  rules of the  Securities  and  Exchange
Commission;  and (vi) the consent of each  nominee to serve as a director of the
Corporation  if so  elected. 

         No  person  shall  be  eligible  for  election  as a  director  of  the
Corporation unless nominated in accordance with the procedures set forth in this
Section  1.08.  If the facts show that a nomination  was not made in  accordance
with the foregoing  provisions,  the  Presiding  Officer of the meeting shall so
determine and declare to the meeting,  whereupon the defective  nomination shall
be disregarded.  Public  disclosure of the date of a forthcoming  meeting may be
made by the Corporation for purposes of this Section 1.08 not only by the giving
of the  formal  notice  of the  meeting  but also (i) by  notice  to a  national
securities exchange or to the National  Association of Securities Dealers,  Inc.
(if the Corporation's  common stock is then listed on such exchange or quoted on
NASDAQ),  (ii) by filing a report under  Section 13 or 15(d) of the Exchange Act
(if the Corporation is then subject thereto), (iii) by a mailing to stockholders
or (iv) by general press release.  

         Section 1.09 BUSINESS AT ANNUAL MEETINGS. No business may be transacted
at an annual meeting of  stockholders  other than business that is (i) specified
in the  notice  of  meeting  (or  any  supplement  thereto)  given  by or at the
direction of the Board of Directors,  (ii) otherwise properly brought before the
annual  meeting  by or at the  direction  of the  Board  of  Directors  or (iii)


<PAGE>


otherwise properly brought before the annual meeting by a stockholder who (w) is
a stockholder of record on the date of the giving of the notice  provided for in
this Section 1.09 and on the record date for the  determination  of stockholders
entitled  to vote at such  annual  meeting  and (x)  complies  with  the  notice
procedures  set forth in this Section  1.09. An eligible  stockholder  may bring
business  before an annual  meeting only if such  stockholder  has caused proper
written  notice with respect  thereto to be delivered to, or mailed and received
at, the principal  executive  offices of the  Corporation not more than 120 days
nor  less  than 90 days  prior  to the  date of the  annual  meeting;  provided,
however,  that in the event  that less  than 100  days'  notice or prior  public
disclosure  of the date of the meeting is given to  stockholders,  such  written
notice  will also be timely if so  received by the close of business on the 10th
day  following  the first to occur of (y) the date on which  such  notice of the
date of the annual meeting was mailed or (z) the date on which public disclosure
of such date was made. For such notice by an eligible  stockholder to be proper,
such notice must set forth as to each matter such stockholder  proposes to bring
before the annual meeting: (1) a brief description of the business desired to be
brought before the meeting and the reasons for  conducting  such business at the
meeting;  (2) the name and record  address  of the  stockholder  who  intends to
propose such  business;  (3) the class or series and number of shares of capital
stock of the  Corporation  that are  owned  beneficially  or of  record  by such
stockholder;  (4) a description of all  arrangements or  understandings  between
such  stockholder  and any other  person or persons  (including  their names) in
connection  with the  proposal  of such  business  by such  stockholder  and any
material interest of the stockholder in such business;  and (5) a representation
that such  stockholder  intends  to  appear in person or by proxy at the  annual
meeting  to bring  such  business  before  the  meeting. 

<PAGE>


         No business  shall be conducted at the annual  meeting of  stockholders
except  business  brought  before the  annual  meeting  in  accordance  with the
procedures  set  forth in this  Section  1.09,  provided,  however,  that,  once
business has been properly  brought before the annual meeting in accordance with
such  procedures,  nothing  in this  Section  1.09  shall be deemed to  preclude
discussion by any stockholder of any such business.  If the Presiding Officer of
an annual meeting  determines that business was not properly  brought before the
annual  meeting in  accordance  with the  foregoing  procedures,  the  Presiding
Officer shall declare to the meeting that the business was not properly  brought
before the meeting and such business  shall not be  transacted. 

         Notwithstanding  the  foregoing  provisions  of this  Section  1.09,  a
stockholder  shall also comply with all applicable  requirements of the Exchange
Act and the rules and  regulations  thereunder  with  respect to the matters set
forth in this  Section  1.09.  Nothing in this  Section  1.09 shall be deemed to
affect any rights of  stockholders  to request  inclusion  of  proposals  in the
Company's proxy statement pursuant to Rule 14a-8 under the Exchange Act.


                                   ARTICLE II

                               BOARD OF DIRECTORS

         Section  2.01  NUMBER.   Except  as  otherwise   provided  in  Restated
Certificate of Incorporation,  the number of directors shall be the number fixed
from time to time by the Board.

         Section  2.02  ELECTION  AND  TERM.  At  each  annual  meeting  of  the
stockholders,  directors shall be elected to hold office until their  successors
are elected and qualified or until their earlier resignation or removal.


<PAGE>


         Section 2.03  MEETINGS OF THE BOARD.  Regular  meetings of the Board of
Directors  shall be held at such times and places as the Board shall  determine.
Special  meetings of the Board shall be held whenever  called by the Chairman of
the Board,  the  President  or by a majority of the  directors  in office at the
time.  

         Section 2.04 NOTICE OF MEETINGS. No notice need be given of any regular
meeting of the Board of Directors or of any adjourned  meeting of the Board. Nor
need notice be given to any director who signs a written  waiver  thereof or who
attends the meeting  without  protesting  the lack of notice.  Notices  need not
state the purpose of the meeting.  

         Notice of each  special  meeting  of the  Board  shall be given to each
director either by first class mail at least three days before the meeting or by
telegram, telex, cable or like transmission, telecopy, personal written delivery
or telephone at least one day before the meeting.  Any notice given by telephone
shall be immediately  confirmed by telegram,  telex, cable or like transmission.
Notices are deemed to have been given:  by mail, when deposited in the mail with
postage prepaid; by telegram, telex, cable or like transmission,  at the time of
sending; and by personal delivery or telephone, at the time of delivery. Written
notices  shall be sent to a director at the address  designated  by him for that
purpose,  or, if none has been so  designated,  at his last known  residence  or
business address.

         Section 2.05 QUORUM AND VOTE OF DIRECTORS. Except as otherwise provided
in the Restated  Certificate of  Incorporation or required by law, a majority of
the entire Board of Directors  shall  constitute a quorum for the transaction of
business or of any specified  item of business and the vote of a majority of the
directors  present at a meeting  at the time of such  vote,  if a quorum is then
present,  shall be the act of the Board.

<PAGE>


         Section  2.06  CONDUCT OF  MEETINGS.  The  Chairman of the Board or the
President,  if any,  shall preside at any meeting of the Board of Directors.  In
the  absence of the  Chairman of the Board or the  President,  a chairman of the
meeting shall be elected from the directors present.  If present,  the Secretary
shall act as  secretary  of any  meeting  of the  Board.  In the  absence of the
Secretary,  the  chairman  of the  meeting  may  appoint  any  person  to act as
secretary of the meeting.

         Section 2.07 RESIGNATIONS OF DIRECTORS. Any director of the Corporation
may resign at any time by giving  written notice to the Board of Directors or to
the Secretary of the Corporation. Such resignation shall take effect at the time
specified therein or, if such time is not specified  therein,  then upon receipt
thereof;  and  unless  otherwise  specified  therein,  the  acceptance  of  such
resignation shall not be necessary to make it effective. Section 2.08 REMOVAL OF
DIRECTORS. Any director or the entire Board of Directors may be removed, with or
without cause, at any time by the affirmative  vote of the holders of a majority
of the shares then entitled to vote at an election of directors.

         Section 2.09.  NEWLY CREATED  DIRECTORSHIPS  AND  VACANCIES.  Except as
otherwise provided in the Restated Certificate of Incorporation or by law, newly
created directorships  resulting from an increase in the number of directors and
vacancies  occurring in the Board of  Directors  for any reason,  including  the
removal of directors  with or without  cause,  may be filled by the  affirmative
vote of a majority of the directors then in office,  although less than a quorum
exists, or by a sole remaining director. 

         Section  2.10  COMMITTEES.  The Board of Directors  may, by  resolution
passed by a majority of the whole Board, designate one or more committees,  each
committee  to consist of one or more of the  directors of the  Corporation.

<PAGE>



         The Board may designate one or more  directors as alternate  members of
any committee,  who may replace any absent or disqualified member at any meeting
of the committee. In the absence or disqualification of a member of a committee,
the member or members thereof present at any meeting and not  disqualified  from
voting,  whether or not constituting a quorum,  may unanimously  appoint another
member of the  Board to act at the  meeting  in the place of any such  absent or
disqualified  member. 

         Any such  committee,  to the extent  provided in the  resolution of the
Board but subject to the  limitation of Section  141(c) of the Delaware  General
Corporation Law, shall have and may exercise all the powers and authority of the
Board in the management of the business and affairs of the Corporation,  and may
authorize  the seal of the  Corporation  to be affixed  to all papers  which may
require it.

         The  provisions  of Section  2.04 for notice of  meetings  of the Board
shall apply also to meetings of committees,  unless different notice  procedures
shall be  prescribed  by the  Board.  

         Each such committee  shall serve at the pleasure of the Board. It shall
keep minutes of its meetings and report the same to the Board and shall  observe
such other procedures as are prescribed by the Board.

         Section 2.11 COMPENSATION OF DIRECTORS. Each director shall be entitled
to receive as compensation  for his services as director or committee  member or
for  attendance  at meetings of the Board of Directors or  committees,  or both,
such  amounts  (if any) as shall be fixed from time to time by the  Board.  Each
director shall be entitled to reimbursement  for reasonable  traveling  expenses
incurred by him in attending  any such meeting.  No such payment shall  preclude

<PAGE>


any director from serving the  Corporation  in any other  capacity and receiving
compensation therefor.

         Section 2.12 TELEPHONIC MEETINGS.  Any one or more members of the Board
of Directors or any committee thereof may participate in a meeting of such Board
or  committee  by  means  of  conference  telephone  or  similar  communications
equipment  by means of which all persons  participating  in the meeting can hear
each  other,  and  participation  in a meeting  by such means  shall  constitute
presence in person at such meeting.

         Section  2.13  ACTION  BY  WRITTEN  CONSENT.  Any  action  required  or
permitted  to be taken  at any  meeting  of the  Board  of  Directors  or of any
committee  thereof may be taken without a meeting if all members of the Board or
the committee  consent  thereto in writing and the writing or writings are filed
with the minutes of proceedings of the Board or committee.


                                   ARTICLE III

                                    OFFICERS

         Section 3.01 OFFICERS.  The officers of the Corporation shall include a
Chairman of the Board,  a President,  a Treasurer  and a Secretary  and may also
include a Vice Chairman of the Board,  one or more Vice  Presidents  (who may be
further  classified by such descriptions as "executive,"  "senior" or "group" as
determined by the Board of Directors), a Controller,  Assistant Vice Presidents,
Assistant  Treasurers,  Assistant  Secretaries,  Assistant Controllers and other
officers and agents,  as the Board of Directors may deem necessary or desirable.

         Each officer  shall have such  authority  and perform  such duties,  in
addition to those specified in these By-Laws,  as may be prescribed by the Board
from time to time.  The Board may from time to time  authorize  any  officer  to

<PAGE>


appoint and remove any other  officer or agent and to  prescribe  such  person's
authority and duties. Any person may hold at one time two or more offices.

         Section 3.02.  TERM OF OFFICE,  RESIGNATION  AND REMOVAL.  Each officer
shall hold office for the term for which  elected or  appointed  by the Board of
Directors,  and until the person's  successor  has been elected or appointed and
qualified or until his earlier resignation or removal.

         Any  officer  may  resign at any time by giving  written  notice to the
Board or to the Secretary of the Corporation. Such resignation shall take effect
at the time specified  therein or, if such time is not specified  therein,  then
upon receipt thereof;  and unless otherwise specified therein, the acceptance of
such resignation shall not be necessary to make it effective.

         Any officer  may be removed by the Board,  with or without  cause.  The
election  or  appointment  of an  officer  shall not of itself  create  contract
rights.

         Section 3.03 CHAIRMAN OF THE BOARD.  The Chairman of the Board shall be
a member of the Board of  Directors.  The Chairman of the Board shall preside at
all  meetings  of the  stockholders  and  the  Board  of  Directors  and,  if so
designated  by  the  Board,   shall  be  the  chief  executive  officer  of  the
Corporation.  

         Section 3.04  PRESIDENT.  Unless there shall be a Chairman of the Board
designated  by the Board of  Directors  as the chief  executive  officer  of the
Corporation,  the  President  shall  be  the  chief  executive  officer  of  the
Corporation.  Subject to the control of the Board of Directors  and the Chairman
of the Board (if designated  chief  executive  officer),  the President shall be
responsible  for the  day-to-day  management  of the business and affairs of the
Corporation  and shall enjoy all other powers  commonly  incident to the office.

<PAGE>


         Section 3.05 VICE  PRESIDENTS.  Each of the Vice Presidents  shall have
such  authority and perform such duties as may be prescribed  from time to time.


         Section 3.06 TREASURER AND ASSISTANT  TREASURERS.  The Treasurer  shall
have the care and custody of all funds and securities of the  Corporation,  keep
accounts of receipts and  disbursements  and of deposit or custody of moneys and
other  valuables and enjoy all powers  commonly  incident to the office.

         In the case of the absence or  inability to act of the  Treasurer,  any
Assistant Treasurer may act in the Treasurer's place. 

         Section 3.07 SECRETARY AND ASSISTANT  SECRETARIES.  The Secretary shall
keep the minutes of the meetings of the  stockholders and the Board of Directors
and give notice of such  meetings,  have custody of the corporate seal and affix
and attest such seal to any  instrument to be executed  under seal and enjoy all
powers commonly  incident to the office. 

         In the case of the absence or  inability to act of the  Secretary,  any
Assistant Secretary may act in the Secretary's place.

         Section 3.08 CONTROLLER AND ASSISTANT CONTROLLERS. The Controller shall
have control of all books of account of the Corporation  (other than those to be
kept by the  Treasurer),  render  accounts  of the  financial  condition  of the
Corporation and enjoy all powers commonly incident to the office. 

         In the absence or inability  to act of the  Controller,  any  Assistant
Controller may act in the Controller's place.

         Section  3.09  COMPENSATION.   Compensation  of  officers,  agents  and
employees of the  Corporation  shall be fixed from time to time by, or under the
authority of, the Board of Directors.

<PAGE>


                                   ARTICLE IV

                                  CAPITAL STOCK

         Section  4.01  FORM  OF  CERTIFICATES.  Unless  otherwise  provided  by
resolution  of the Board of  Directors,  the shares of stock of the  Corporation
shall  be  represented  by  certificates  which  shall  be in  such  form  as is
prescribed by law and approved by the Board.

         Section  4.02  TRANSFER OF SHARES.  Transfers of shares of stock of the
Corporation  shall be registered on its records  maintained for such purpose (i)
upon  surrender  to the  Corporation  or a transfer  agent of a  certificate  or
certificates  representing the shares  requested to be transferred,  with proper
endorsement on the  certificate or  certificates  or on a separate  accompanying
document,  together  with such  evidence of the  payment of  transfer  taxes and
compliance with other provisions of law as the Corporation or its transfer agent
may  require  or (ii)  if  shares  are not  represented  by  certificates,  upon
compliance  with such  transfer  procedures  as may be  approved by the Board or
prescribed by applicable law.

         The Corporation  shall be entitled to treat the holder of record of any
share as the  holder in fact  thereof  and,  accordingly,  shall not be bound to
recognize  any equitable or other claim to or interest in such share on the part
of any  other  person  whether  or not it shall  have  express  or other  notice
thereof,  except as expressly  provided by law.

         Section 4.03  REGULATIONS.  The Board of Directors shall have authority
to make such  rules and  regulations  as it may deem  expedient  concerning  the
issue,  transfer  and  registration  of  shares  of  stock  of the  Corporation,
including  without  limitation  such  rules  and  regulations  as may be  deemed
expedient  concerning the issue of certificates in lieu of certificates  claimed
to have been lost, destroyed, stolen or mutilated.

<PAGE>


                                    ARTICLE V

                               GENERAL PROVISIONS

         Section  5.01  CORPORATE  SEAL.  The  Board of  Directors  may  adopt a
corporate seal, alter such seal at its pleasure,  and authorize it to be used by
causing it or a facsimile to be affixed or impressed or  reproduced in any other
manner.

         Section 5.02 VOTING UPON STOCKS.  Unless otherwise ordered by the Board
of  Directors,  the chief  executive  officer of the  Corporation,  or any other
officer of the  Corporation  designated  by the chief  executive  officer of the
Corporation, shall have full power and authority on behalf of the Corporation to
attend  and to act and to vote in  person  or by  proxy  at any  meeting  of the
holders of securities of any  corporation  in which the  Corporation  may own or
hold stock or other  securities,  and at any such meeting  shall possess and may
exercise  in  person  or by proxy  any and all  rights,  powers  and  privileges
incident  to  the  ownership  of  such  stock  or  other  securities  which  the
Corporation,  as the owner or holder thereof, might have possessed and exercised
if present. The chief executive officer of the Corporation, or any other officer
of the Corporation designated by the chief executive officer of the Corporation,
may also  execute and deliver on behalf of the  Corporation  powers of attorney,
consents,  proxies,  waivers of notice  and other  instruments  relating  to the
stocks or securities  owned or held by the  Corporation.  The Board of Directors
may, from time to time,  by resolution  confer like powers upon any other person
or persons.

         Section 5.03 AMENDMENTS. These By-Laws and any amendments hereof may be
altered,  amended,  or repealed,  and new By-Laws may be adopted, as provided in
the Restated Certificate of Incorporation.


                                                                   Exhibit 10.42


                                    AGREEMENT

     THIS AGREEMENT, made this __3RD__ day of __SEPTEMBER,  '97__ by and between
DIANON  SYSTEMS,  INC.,  its  affiliates,  subsidiaries,  successors and assigns
(collectively  called  hereinafter  "DIANON") and Vernon L. Wells, an individual
residing at 10973 Chase Lane #B, St. Louis,  Missouri 63146 (hereinafter  called
"Employee").

     In consideration  of the commencement of Employee's  employment with DIANON
as Vice President of Sales,  the payment of  compensation  and benefits for such
employment,   and  access  to   sensitive   information,   Employee  and  DIANON
acknowledge,  represent and agree to the terms and  conditions set forth in this
Agreement.

     (1) Employee  agrees that, to the fullest extent  permitted by law, for the
period of one (1) year after the date of termination  of employment  with DIANON
(for whatever reasons),  Employee (a) will not solicit business on behalf of any
entity which is conducting any business  which  competes with DIANON's  business
("Competing  Entity"),  (b) will not solicit  business from customers of DIANON,
(c) will not solicit the  employment  or  services  or any of the  employees  of
DIANON,  (d) will not,  directly or  indirectly,  participate  in the ownership,
management,  operation or control of any Competing Entity in the geographic area
located  within  one  hundred  (100)  miles of DIANON  offices,  or in any other
geographic area in which Employee may have rendered service to DIANON during the
two (2) year period prior to the termination of employment.

     (2) Employee's  employment  with DIANON creates a relationship of trust and
confidence  between the parties.  Employee agrees that, during and after his/her
employment with DIANON,  Employee will not use or disclose, or allow anyone else
to use or disclose, any confidential information relating to the products, sales
and/or business  affairs of DIANON or of any customer or supplier of DIANON,  or
any information created,  discovered, or developed by or for DIANON, or acquired
by DIANON,  that has  commercial  value in DIANON's  present or future  business
("Confidential  Information"),  except as may be necessary in the performance of
Employee's  employment  with  DIANON  or as  may be  authorized  in  advance  by
appropriate  officials of DIANON.  By way of  illustration,  but not limitation,
Confidential   Information   includes  processes,   formulas,   data,  know-how,
inventions,   improvements,   techniques,   marketing   plans,   product  plans,
strategies,  forecasts,  customer lists and any other  information  Employee has
reason to know  DIANON  would  like to treat as  confidential  for any  purpose.
Employee  agrees to keep  Confidential  Information  secret  whether  or not any
document containing such information is marked confidential.

     (3) All rights,  title and  interest in all  records,  documents,  or files
concerning the business of DIANON,  including, but not limited to, biomaterials,

<PAGE>


processes,  letters,  trade  secrets,  laboratory  notebooks or other written or
electronically recorded material, whether or not produced by the Employee, shall
be and remain the  property  of DIANON.  Upon  termination  of  employment,  the
Employee shall not have the right to remove any such records from the offices of
DIANON. In addition,  Employee agrees to promptly return to DIANON all things of
whatsoever  nature that belong to DIANON,  and all records (in whatsoever  form,
format or medium) containing or related to Confidential Information of DIANON.

     (4) Employee  agrees to assign,  and does hereby  assign to DIANON,  all of
his/her  right,  title  and  interest  in and to all  inventions,  improvements,
discoveries or technical developments,  whether or not patentable,  which he/she
solely or jointly  with others,  may  conceive or reduce to practice  during the
term of his/her  employment (a) which are related in whole or in part,  directly
or indirectly,  to DIANON's product line, research and development,  or field of
technological or industrial specialization,  or (b) in the course of utilization
by DIANON of Employee's services in a technical or professional  capacity in the
areas  of  research,   development,   marketing,   management,   engineering  or
manufacturing,  or (c)  pursuant  to any  project of which  Employee is or was a
participant or member that is or was either  financed or directed by DIANON,  or
(d) at DIANON's expense, in whole or in part.

     (5)  Employee  agrees to  disclose  promptly to  DIANON's  Chief  Executive
Officer or his designee, all ideas,  discoveries,  and improvements conceived by
Employee  alone or in  collaboration  with others,  and to cooperate  fully with
DIANON both during and after  employment,  with  respect to the  procurement  of
patents for the  establishment  and  maintenance  of DIANON's or its  designee's
rights  and  interests  in  said   invention,   improvements,   discoveries   or
developments,  and to sign  all  papers  which  DIANON  may  deem  necessary  or
desirable for the purpose of vesting  DIANON or its designees  with such rights,
the expenses thereof to be paid by DIANON.

     (6) The  Employee  shall,  while  employed by DIANON,  devote  his/her best
efforts and his/her full time to the business of DIANON.

     (7) In the event of a breach or threatened breach of the provisions in this
Agreement, DIANON shall be entitled to an injunction restraining such breach, it
being  recognized that any injury arising from a breach would be irreparable and
would have no adequate  remedy at law; but nothing  herein shall be construed as
prohibiting  DIANON from pursuing any other remedy  available for such breach or
threatened  breach. In the event that Employee breaches or threatens a breach of
this Agreement,  DIANON shall be entitled to have its reasonable  legal fees and
costs paid by the  Employee  for any legal  services  relating  to the breach or
threatened breach.

     (8) This Agreement is not intended, and should not be construed in any way,
as a  contract  of  employment  for a  definite  period  of time or to  limit or
restrain   DIANON's  or  the  Employee's   right  to  terminate  the  employment
relationship at any time.


<PAGE>


     (9) In the event any  provision or paragraph of this  Agreement is declared
to be invalid or unenforceable,  then the balance of this Agreement shall remain
in full force and effect.

     (10) This Agreement  shall be construed and enforced in accordance with the
laws of the State of Connecticut.

     (11) The  foregoing  contains  the entire  Agreement  between  the  parties
pertaining  to  non-competition   and  to  confidential   DIANON  documents  and
information.  No  modification  thereof shall be binding upon the parties unless
the same is in a writing  signed by the respective  parties.  This Agreement and
all of the terms and  conditions  contained  herein  shall  remain in full force
during the period of employment notwithstanding any change in compensation.

     (12) Employee  represents and warrants that he/she has no other  agreements
or  commitments  that  would  hinder  or  prevent  performance  of  his/her  job
responsibilities with DIANON. Unless authorized to do so, Employee agrees not to
disclose to DIANON or use in his/her  employment  with DIANON any  invention  or
confidential information belonging to any former employer or to any other person
other than DIANON.

     IN WITNESS WHEREOF,  the parties have entered into this Agreement as of the
date set forth above.


Employee:                              DIANON SYSTEMS, INC.


/S/  VERNON WELLS                      By:    /S/ KEVIN C. JOHNSON
- --------------------------                -----------------------------

Date:  SEPT 3, 1997                    Date:  SEPTEMBER 3, 1997
     ---------------------                -----------------------------




                                                               Exhibit 10.43


                              SEPARATION AGREEMENT

     WHEREAS,  ROBERT C. VERFURTH 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 ROBERT C. VERFURTH  agree as
follows:

     1. ROBERT C.  VERFURTH  resigns his  full-time  employment  and his officer
position with the COMPANY effective as of September 15, 1997.

     2. The COMPANY  shall pay ROBERT C.  VERFURTH  separation  pay, at his last
rate of base salary, subject to applicable deductions, for the period six months
after his termination and for so much of the following three months as ROBERT C.
VERFURTH has not obtained  other  employment  (the  "Separation  Period").  This
separation pay shall be paid in equal  installments  on regular payroll dates of
the COMPANY throughout the Separation Period.

<PAGE>


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

     4. The  COMPANY  shall pay  ROBERT  C.  VERFURTH  any  bonus he would  have
received  under  the  COMPANY's  1997  Management   Incentive  Program  had  his
employment  continued  through the date on which payments under said program are
made.  This payment will be made at the same time  payments to other  Management
Incentive Program participants are made.

     5. The COMPANY  shall pay for ROBERT C.  VERFURTH to  participate  in Drake
Beam Morin Inc.'s six month Senior Executive Program of outplacement services.

     6. ROBERT C. VERFURTH  agrees to comply with the provisions of the Employee
Proprietary  Information  Agreement  appended  to this  Agreement  as Exhibit A,
subject to Paragraph 11 of this Agreement.

     7.  ROBERT  C.  VERFURTH  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 ROBERT C. VERFURTH  possesses
knowledge.

<PAGE>


     8. ROBERT C.  VERFURTH,  agrees to make  himself  reasonably  available  to
consult with the COMPANY on Sales matters during the Separation Period.

     9. ROBERT C. VERFURTH, 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  COMPANY  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 benefit plans, which ROBERT C. VERFURTH has, had or may
have  against  any of them,  whether  or not now known  arising  from  ROBERT C.
VERFURTH's  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 wrongdoing.

     10.  ROBERT C.  VERFURTH  on  behalf  of  himself,  his  heirs,  executors,
administrators  and assigns,  further  agrees never  directly or  indirectly  to

<PAGE>


commence or prosecute, or to permit or advise to be commenced or prosecuted, any
action,  proceeding,  or charge against any Released COMPANY 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 act,  transaction,
practice,  conduct,  or omission that  occurred  prior to the date he signs this
Agreement,  including but not limited to, rights under any other 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 had, or which at any time hereafter he may have.

           11.  Notwithstanding  the  provisions of the  Employment  Proprietary
Information  Agreement  attached hereto,  ROBERT C. VERFURTH  undertakes and the
COMPANY shall enforce against him only the following obligation not to engage in
any competitive activity.  ROBERT C. VERFURTH agrees that, to the fullest extent
permitted  by law,  for the period of  eighteen  (18)  months  after the date of
termination of employment with the COMPANY,  he (a) will not solicit business on
behalf of any entity  which is  conducting  any  business  which  competes  with
DIANON's  business  ("Competing  Entity"),  (b) will not solicit  business  from
customers of DIANON,  (c) will not solicit the  employment or services of any of
the employees of DIANON,  (d) will not,  directly or indirectly,  participate in

<PAGE>


the ownership,  management,  operation or control of any Competing Entity in the
geographic area in which Employee may have rendered service to DIANON during the
two (2) year period prior to the termination of employment.

     12. ROBERT C.  VERFURTH  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.

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

     14. 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.

     15. In the event  ROBERT C.  VERFURTH  files a claim,  lawsuit or complaint
against any  Released  COMPANY  Party in any court or  governmental  agency with
respect to the claims he has released under this  Agreement,  ROBERT C. VERFURTH
shall be liable for all costs and expenses including legal fees, incurred by any
Released COMPANY Party in defense of that action.

     16. ROBERT C. VERFURTH represents that he has carefully read and completely
understands  this  Agreement  and  that  he  has  entered  into  this  Agreement

<PAGE>


voluntarily  after having had a reasonable  amount of time to consider it and an
opportunity to consult with his legal advisors.

     17.  ROBERT C.  VERFURTH  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 COMPANY Party.

     18.  ROBERT C.  VERFURTH  acknowledges  that he has been given a reasonable
time to review the waivers and  releases  contained in this  Agreement  prior to
signing it.

     19. 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>



     20. This Agreement shall be governed by applicable Federal law and the laws
of the State of Connecticut.

                                           ROBERT C. VERFURTH



Dated:   15 SEP 97                         Signature:   /S/ ROBERT C. VERFURTH
       --------------------                             ------------------------


                                           DIANON SYSTEMS, INC.



Dated:   29 SEPTEMBER, 1997                By:    /S/ KEVIN C. JOHNSON
       ---------------------                      ------------------------------



<TABLE> <S> <C>

<ARTICLE>          5
<MULTIPLIER>       1,000
<CURRENCY>         U.S. Dollars
       
<S>                                  <C>
<PERIOD-TYPE>                        9-MOS
<FISCAL-YEAR-END>                    DEC-31-1997
<PERIOD-START>                       JAN-01-1997
<PERIOD-END>                         SEP-30-1997
<EXCHANGE-RATE>                                1
<CASH>                                    11,151
<SECURITIES>                                   0
<RECEIVABLES>                             14,506
<ALLOWANCES>                               1,085
<INVENTORY>                                  766
<CURRENT-ASSETS>                          28,319
<PP&E>                                    17,077
<DEPRECIATION>                            10,365
<TOTAL-ASSETS>                            36,259
<CURRENT-LIABILITIES>                      8,476
<BONDS>                                        0
                          0
                                    0
<COMMON>                                      68
<OTHER-SE>                                27,397
<TOTAL-LIABILITY-AND-EQUITY>              36,259
<SALES>                                   46,170
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<CGS>                                     23,376
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<OTHER-EXPENSES>                          19,172
<LOSS-PROVISION>                               0
<INTEREST-EXPENSE>                            24
<INCOME-PRETAX>                            3,980
<INCOME-TAX>                               1,711
<INCOME-CONTINUING>                        2,269
<DISCONTINUED>                                 0
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<CHANGES>                                      0
<NET-INCOME>                               2,269
<EPS-PRIMARY>                               0.33
<EPS-DILUTED>                               0.33
        


</TABLE>


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