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 June 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 registrant's  Common Stock, $.01 par value,  outstanding
on August 7, 1997 was 6,456,480 shares.


                      Exhibit Index on page 15 of 35 pages.









                                             DIANON SYSTEMS, INC.
                                               AND SUBSIDIARIES
                                                     INDEX




Part I  FINANCIAL INFORMATION                                                                     PAGE NO.
- -----------------------------                                                                     --------

Item 1.        FINANCIAL STATEMENTS

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

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

               Consolidated  Statements of  Stockholders'  Equity for the twelve
               months 5 ended  December  31, 1996 and the six months  ended June
               30, 1997.

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

               Notes to Consolidated Financial Statements.                                            7

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

Part II  OTHER INFORMATION

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

Signatures                                                                                           14

Exhibit Index                                                                                        15









                                               DIANON SYSTEMS, INC.
                                            CONSOLIDATED BALANCE SHEETS



                                                                              JUNE 30,      DECEMBER 31,
                                                                               1997            1996
                                                                            ------------    ------------
                                                                             (UNAUDITED)
                                                                                               
     ASSETS
CURRENT ASSETS:
     Cash and cash equivalents ..........................................   $ 11,229,132    $  7,488,590
     Accounts receivable, net of allowances of $1,027,705
          and $1,056,920, respectively ..................................     12,729,153      15,426,221
     Prepaid expenses and employee advances .............................      1,262,160       1,189,139
     Prepaid and refundable income taxes ................................        455,964         329,371
     Inventory ..........................................................        785,689         662,567
     Deferred income tax asset ..........................................        677,277         677,277
                                                                            ------------    ------------
Total current assets ....................................................     27,139,375      25,773,165
                                                                            ------------    ------------
PROPERTY AND EQUIPMENT, at cost
     Laboratory and office equipment ....................................     13,051,161      12,233,989
     Leasehold improvements .............................................      3,691,400       3,612,198
       Less - accumulated depreciation and amortization .................     (9,540,726)     (8,606,176)
                                                                            ------------    ------------
                                                                               7,201,835       7,240,011
                                                                            ------------    ------------

INTANGIBLE ASSETS, net of accumulated amortization of
     $3,099,436 and $2,991,286, respectively ............................        496,171         604,313
DEFERRED INCOME TAX ASSET ...............................................        458,465         458,465
OTHER ASSETS ............................................................        359,373         459,696
                                                                            ============    ============
         TOTAL ASSETS ...................................................   $ 35,655,219    $ 34,535,650
                                                                            ============    ============

         LIABILITIES AND STOCKHOLDERS' EQUITY
CURRENT LIABILITIES:
     Accounts payable ...................................................   $  1,211,620    $  2,123,661
     Accrued employee bonuses, commissions and payroll ..................      1,234,039       1,504,430
     Accrued employee stock purchase plan ...............................        916,728         549,540
     Current portion of capitalized lease obligations ...................         40,910          26,107
     Current portion of note payable ....................................        170,663         650,154
     Other accrued expenses .............................................      5,221,623       2,861,268
                                                                            ------------    ------------
           Total current liabilities ....................................      8,795,583       7,715,160
                                                                            ------------    ------------
LONG-TERM PORTION OF CAPITALIZED LEASE OBLIGATIONS ......................        126,450          69,611
DEFERRED INCOME TAX LIABILITY ...........................................        201,951         201,951
                                                                            ------------    ------------
           TOTAL LIABILITIES ............................................      9,123,984       7,986,722
                                                                            ------------    ------------
STOCKHOLDERS' EQUITY
     Common  stock,  par value $.01 per  share, 20,000,000 shares
     authorized, 6,759,857 and 6,712,774 shares issued and outstanding
     at June 30, 1997 and December 31, 1996, respectively ... ..........          67,599          67,128
     Additional paid-in capital .........................................     28,221,558      27,965,560
     Accumulated earnings/(deficit) .....................................        894,234        (554,317)
     Common stock held in treasury, at cost - 319,206 and 117,196 shares
     at June 30, 1997 and December 31, 1996, respectively ...............     (2,652,156)       (929,443)
                                                                            ------------    ------------
         TOTAL STOCKHOLDERS' EQUITY .....................................     26,531,235      26,548,928
                                                                            ============    ============
         TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY .....................   $ 35,655,219    $ 34,535,650
                                                                            ============    ============


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



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



                                                   THREE MONTHS ENDED          SIX MONTHS ENDED
                                                        JUNE 30,                    JUNE 30,
                                                 1997             1996       1997           1996
                                               -----------   -----------   -----------   ----------

                                                                                     
NET REVENUES ...............................   $16,056,419   $13,674,329   $31,657,574   $26,093,148

COST OF GOODS ..............................     7,882,516     6,480,922    15,755,015    12,619,810
                                               -----------   -----------   -----------   -----------
   Gross Profit ............................     8,173,903     7,193,407    15,902,559    13,473,338

SELLING, GENERAL AND ADMINISTRATIVE EXPENSES     6,380,501     5,601,680    12,597,983    10,668,861

RESEARCH & DEVELOPMENT EXPENSES ............       460,860       775,180       968,565     1,582,081
                                               -----------   -----------   -----------   -----------

   Income from Operations ..................     1,332,542       816,547     2,336,011     1,222,396

INTEREST INCOME ............................       132,237       105,247       224,127       229,792

INTEREST EXPENSE ...........................         8,018        20,539        18,821        44,740
                                               -----------   -----------   -----------   -----------

   Income Before Provision for Income Taxes      1,456,761       901,255     2,541,317     1,407,448

PROVISION FOR INCOME TAXES .................       626,407       387,540     1,092,766       605,203
                                               -----------   -----------   -----------   -----------

   Net Income ..............................   $   830,354   $   513,715   $ 1,448,551   $   802,245
                                               ===========   ===========   ===========   ===========

Weighted Average Shares Outstanding ........     6,862,097     6,142,743     6,848,693     6,195,835
                                               -----------   -----------   -----------   -----------

Primary and Fully Diluted Earnings Per Share   $      0.12   $      0.08   $      0.21   $      0.13
                                               ===========   ===========   ===========   ===========



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




                                                 DIANON SYSTEMS, INC.
                                CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
                               FOR THE TWELVE MONTHS ENDED DECEMBER 31, 1996 AND
                                        THE SIX MONTHS ENDED JUNE 30, 1997
                                                   (UNAUDITED)


                                                                                Common Stock  Common Stock  
                                                       Additional               Acquired for  Acquired for  Shareholder
                                     Common Stock       Paid-In     Accumulated   Treasury,    Treasury,        Note
                                  Shares     Amount     Capital      Deficit       Shares       at Cost      Receivable       Total
                                 ---------------------------------------------------------------------------------------------------

                                                                                                  
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 ...     23,621      236      107,476           --         --             --            --       107,712
    Exercise of warrants net of
      exercise costs...........    377,702    3,777    1,536,540           --    422,298      2,478,889            --     4,019,206
    Common stock acquired for
      treasury ................         --       --           --           --   (489,494)    (3,208,332)           --    (3,208,332)
    Extinguishment of share-
      holder note receivable ..         --       --     (296,000)          --         --              --      296,000            --
    Stock compensation expense -
        stock options .........         --       --        7,887           --         --              --           --         7,887
    Net Income ................         --       --           --    2,170,116         --              --           --     2,170,116
                                 ---------------------------------------------------------------------------------------------------
BALANCE, December 31, 1996 ....  6,712,774   67,128   27,965,560     (554,317)  (117,196)       (929,443)          --    26,548,928
    Stock options exercised ...     22,531      225      102,516           --         --              --           --       102,741
    Employee stock purchase
      plan options exercised ..         --       --      (57,568)          --     14,990         124,567           --        66,999
    Stock grants ..............     24,552      246      211,050           --         --              --           --       211,296
    Common stock acquired
      for treasury ............         --       --           --           --   (217,000)     (1,847,280)          --    (1,847,280)
    Net Income ................         --       --           --    1,448,551         --              --           --     1,448,551
                                 ---------------------------------------------------------------------------------------------------
BALANCE, June 30, 1997 ........  6,759,857  $67,599  $28,221,558   $  894,234   (319,206)    ($2,652,156)      $   --   $26,531,235
                                 ===================================================================================================




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






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



                                                                                         JUNE 30,
                                                                                  1997              1996
                                                                            ----------------  --------------
        CASH FLOWS FROM OPERATING ACTIVITIES:
                                                                                                 
           Net income                                                            $1,448,551       $288,530
        Adjustments to reconcile net income to net cash provided by (used
           in) operations -
           Non-cash charges
              Depreciation and amortization                                       1,338,546        497,088
              Stock compensation expense                                            211,296             --
              Loss on the disposal of fixed assets                                   40,914         18,845
              Investment write-down                                                      --          4,053
        Changes in other current assets and liabilities
           Decrease (increase) in accounts receivable                             2,697,068     (1,328,664)
           (Increase) decrease in prepaid expenses and employee advances           (199,614)       433,819
           (Increase) in inventory                                                 (123,122)       (41,064)
           Decrease (increase) in other assets                                       80,430         (4,443)
           Increase (decrease) in accounts payable and accrued liabilities        1,582,892       (551,319)
                                                                            ---------------   ------------
                  Net cash provided by (used in) operating activities             7,076,961       (683,155)
                                                                            ---------------   ------------
        CASH FLOWS FROM INVESTING ACTIVITIES:
           Capital expenditures                                                  (1,316,271)      (541,080)
           Proceeds from the sale of stock held for investment                        9,064         57,530
           Proceeds from the disposal of fixed assets                                    --          7,500
                                                                            ---------------   ------------
           Net cash (used in) investing activities                               (1,307,207)      (476,050)
                                                                            ---------------   ------------
        CASH FLOWS FROM FINANCING ACTIVITIES:
           Repayments of note payable                                              (479,491)      (223,939)
           Borrowings (repayments) of capitalized lease obligations                 127,819        (15,171)
           Purchase of common stock acquired for treasury                        (1,847,280)       (67,500)
           Stock options exercised                                                  102,741             --
           Employee stock purchase plan options exercised                            66,999             --
                                                                            ---------------   ------------
                  Net cash (used in) financing activities                        (2,092,212)      (306,610)
                                                                            ---------------   ------------
                  Net increase (decrease) in cash and cash equivalents            3,740,542     (1,465,815)

        CASH AND CASH EQUIVALENTS, beginning of period                            7,488,590     10,990,231
                                                                            ---------------   ------------
        CASH AND CASH EQUIVALENTS, end of period                                $11,229,132     $9,524,416
                                                                            ===============   ============

        Supplemental cash flow disclosures: 
          Cash paid during the period:
              Interest                                                              $18,999        $24,272
              Income Taxes                                                        1,157,417            458


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






                              DIANON SYSTEMS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.   THE  COMPANY - The  consolidated  balance  sheet as of June 30,  1997,  the
     related  consolidated  statements of operations for the three and six month
     periods ended June 30, 1997 and 1996, the related  consolidated  statements
     of cash flow for the six  months  ended  June 30,  1997 and  1996,  and the
     related  consolidated  statements  of  stockholders'  equity for the twelve
     months ended  December 31, 1996 and the six months ended June 30, 1997 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 June 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 six months ending June 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 six months ended June 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 Half 1997" - six months  ended June 30, 1997 "First Half 1996" - six
     months ended June 30, 1996

     "Second  Quarter  1997" - three months ended June 30, 1997 "Second  Quarter
     1996" - three months ended June 30, 1996




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

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

    o     NET REVENUES

Net revenues were $31.7 million  during the First Half 1997, an increase of $5.6
million or 21% from the First Half 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 Half
1997 over the comparable  period of 1996 was offset to some extent by a decrease
in clinical chemistry and hospital based tissue testing services.

Net revenues were $16.1 million  during the Second  Quarter 1997, an increase of
$2.4  million or 17% from the  Second  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 $15.8 million during the First Half 1997, an increase
of $3.1  million  or 25% from the First  Half  1996.  Salaries  and  wages  were
approximately  $5.3 million in the First Half 1997,  an increase of $1.3 million
or 34% from the First Half 1996.  This increase was principally due to increased
laboratory  and  physician  employment  incurred to support  increased  anatomic
pathology  testing  services.  Laboratory  supplies  decreased  to  8.8%  of net
revenues in the First Half 1997 from 10.5% in the First Half 1996. This decrease
was the result of cost  efficiencies.  Logistics  were $3.1 million in the First
Half 1997,  an  increase  of $1.2  million or 59% from the First Half 1996.  The
increase  in logistic  costs was  principally  due to  supporting  new  anatomic
pathology  testing  services.  As a percentage  of net  revenues,  cost of sales
increased to 50% during the First Half 1997 from 48% during the First Half 1996.

Cost of goods was $7.9 million  during the Second  Quarter  1997, an increase of
$1.4  million  or 22% from the  Second  Quarter  1996.  As a  percentage  of net
revenues,  cost of sales increased to 49% in the Second Quarter 1997 from 47% in
the Second Quarter 1996.

     o    GROSS PROFIT

Gross profits were $15.9 million during the First Half 1997, an increase of $2.4
million or 18% from the First Half  1996.  The  Company's  gross  profit  margin
decreased  to 50% in the First Half 1997 from 52% in the First  Half  1996.  The
decrease in gross profit margin was due to the continued  erosion of the average
unit price  reimbursed for certain clinical  chemistry  testing services and the
higher costs associated with providing anatomic pathology testing services.

Gross profits were $8.2 million  during the Second  Quarter 1997, an increase of
$980,000 or 14% from the Second Quarter 1996. The Company's  gross profit margin
decreased to 51% in the Second Quarter 1997 from 53% in the Second Quarter 1996.

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.  Also,  payment for services such as
those  provided  by the  Company is and likely  will  continue to be affected by
periodic reevaluations made by payors concerning which services to reimburse and
which to cease reimbursing.  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  Budget  Reconciliation  Act  recently  adopted by
Congress,  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 Budget  Reconciliation  Act recently adopted would freeze
fee schedule payments for the 1998 - 2002 period.

The Budget  Reconciliation  Act 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,  as well as coverage
for annual  prostate cancer  screening,  including a  prostate-specific  antigen
blood test, for  beneficiaries  over age 50. 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  nonsurgical
services,  including pathology, is currently $33.8454, the Budget Reconciliation
Act  recently  adopted by Congress  includes a  provision  that merges the three
existing  conversion factors into one, for all types of services  provided.  The
Health Care  Financing  Administration  (the "HCFA") has  estimated  this single
factor  will be $37.13 - an  increase  of 9.7% over the 1996  conversion  factor
applicable to pathology services.

There was an overall  decrease of 5.7%  between  1996 and 1997 in payments  for
pathology  services,  plus an additional  decrease in Connecticut  due to HCFA's
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  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 Budget  Reconciliation  Act  recently
adopted by Congress, 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.

For example,  the Budget  Reconciliation  Act recently adopted by Congress would
revise the Medicare  program  substantially  to permit  beneficiaries  to choose
between  traditional   fee-for-service   Medicare  and  several  non-traditional
Medicare   options,   including   managed  care  plans  and   provider-sponsored
organization plans. These non-traditional Medicare plans 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 Budget  Reconciliation Act 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.



Finally,  the Budget  Reconciliation  Act recently adopted 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.

Because of the  uncertainties  about how the Medicare changes such as those just
described 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,  they  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 $12.6 million during the First
Half 1997,  an  increase of $1.9  million or 18% from the First Half 1996.  As a
percentage  of  net  revenues,  selling,  general  and  administrative  expenses
decreased to 40% in the First Half 1997 from 41% in the First Half 1996.

Selling, general and administrative expenses were $6.4 million during the Second
Quarter 1997, an increase of $779,000 or 14% from the Second  Quarter 1996. As a
percentage  of  net  revenues,  selling,  general  and  administrative  expenses
decreased to 40% in the Second Quarter 1997 from 41% in the Second Quarter 1996.

Severance costs of approximately  $159,000 were recorded in the First Half 1997.
Severance costs of approximately $46,000 were recorded in the First Half 1996.

Investment  write-downs  of  $11,000  were  recorded  in the First  Half 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  Half 1997.  The
Company sold its remaining shares in the first quarter of 1997.

     o    RESEARCH AND DEVELOPMENT

Research  and  development  expenses  were  $969,000  in the First Half 1997,  a
decrease of $614,000 or 39% from the First Half 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.  During the first  quarter of 1997,  the  Company
reorganized its research and development technology activities.

Research and  development  expenses were $461,000 in the Second  Quarter 1997, a
decrease of $314,000 or 41% from the Second Quarter 1996.

     o    INTEREST INCOME

The Company's  interest  income was $224,000 for the First Half 1997, a decrease
of $6,000 or 2% from the First  Half  1996.  Interest  income for the First Half
1997 was earned on an average  investment  of $8.7  million  compared  with $9.8
million in the First  Half 1996.  Interest  income was  $132,000  for the Second
Quarter  1997,  an  increase  of $27,000 or 26% from the  Second  Quarter  1996.
Interest income for the Second Quarter 1997 was earned on an average  investment
of $9.5 million compared with $9.0 million in the Second Quarter 1996.




      o    INTEREST EXPENSE

Interest  expense was $19,000 for the First Half 1997,  a decrease of $26,000 or
58% from the First Half 1996.  The  decrease in interest  expense was due to the
pay-down  of a portion of the $3.5  million  term loan  obtained in July of 1993
which bears interest at 6% per year.  Interest expense was $8,000 for the Second
Quarter 1997, a decrease of $13,000 or 61% from the Second Quarter 1996.

      o    PROVISION FOR INCOME TAXES

Provision  for income tax expense was $1.1  million for the First Half 1997,  an
increase of $488,000 or 81% from the First Half 1996. The effective tax rate was
43% during both the First Half 1997 and 1996.

       o   NET INCOME

As a result of the  foregoing,  net income was $1.4  million  for the First Half
1997,  an increase  of $646,000 or 81% from the First Half 1996.  Net income was
$830,000 during the Second Quarter 1997, an increase of $317,000 or 62% from the
Second Quarter 1996.

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

As of June 30,  1997,  the  Company  had  total  cash and  cash  equivalents  of
approximately  $11.2  million of which  $10.2  million  was  invested  in a fund
holding U. S. Treasury securities with maturities of less than three months.

The Company had working  capital of $18.3  million at June 30, 1997  compared to
$18.1 million at December 31, 1996,  and the working  capital ratio was 3.9 to 1
at June 30, 1997 compared to 3.4 to 1 at December 31, 1996.

Domestic  trade  receivables,  net,  were $12.6  million as of June 30,  1997, a
decrease  of $2.6  million  or 17% from  December  31,  1996.  During the Second
Quarter 1997, the average number of days sales in domestic trade receivables was
approximately  75 days.  The average  number of days sales has decreased from 94
days for the month of December 1996 to 75 days for the month of June 1997.  This
decrease  was the  result  of  improved  collection  efficiencies  resulting  in
significantly  reducing  domestic  accounts  receivable from $15.2 million as of
December 31, 1996 to $12.6 million as of June 30, 1997.

Capital  expenditures during the First Half 1997 were approximately $1.3 million
compared to $541,000 for the First Half 1996.

In July 1993,  the Company  obtained a $3.5  million  term loan from a bank that
bears  interest  at 6% per year and is payable  over a 47 month  period.  During
1995,  the  term  loan  agreement  was  modified  to  revise  certain  financial
covenants,  including  those with respect to tangible net worth and debt service
coverage  requirements and limitation on certain  expenditures.  The Company has
outstanding  under  such  term loan  principal  in the  amount of  approximately
$171,000 as of June 30,  1997.  During the Second  Quarter  1997,  there were no
changes in the Company's existing debt agreements.

As of June 30, 1997,  the Company has in its treasury  319,206  shares of Common
Stock  allocated for the Company's  Employee Stock Purchase Plan at a total cost
of $2.7 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.








PART II  OTHER INFORMATION
               

Item 6            Exhibits and Reports on Form 8-K
                  --------------------------------
                  a    Exhibits

                       (10.39)    Amendment,  dated April 30, 1997, by the
                                  Registrant and Richard A. Sandberg (filed
                                  herewith).

                       (10.40)    Security Agreement dated April 30, 1997 by the
                                  Registrant and Richard A. Sandberg (filed
                                  herewith).

                       (10.41)    Secured Promissory Note dated April 30, 1997
                                  by Richard A. Sandberg in favor of the
                                  Registrant (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 June 30, 1997.









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.


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



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







                                  EXHIBIT INDEX


                                                                                                         Page No.
                                                                                                       
(10.39)         Amendment, dated April 30, 1997, by the Registrant and Richard A. Sandberg (filed              16
                herewith).

(10.40)         Security Agreement dated April 30, 1997 by the Registrant and Richard A. Sandberg              18
                (filed herewith).

(10.41)         Secured Promissory Note dated April 30, 1997 by Richard A. Sandberg in favor of the            33
                Registrant.(filed herewith)

(27.1)          Financial Data Schedule (filed herewith).                                                      35