Exhibit 99.2

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350
                               ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Dianon Systems, Inc. (the "Company")
on Form 10-Q for the period ending September 30, 2002, as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), I, David
R. Schreiber, Chief Financial Officer of the Company, certify, pursuant to
Section 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley
Act of 2002, that to my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of
the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material
respects, the financial condition and results of operations of the Company.

/s/ DAVID R. SCHREIBER
- --------------------------
David R. Schreiber
Chief Financial Officer
November 8, 2002