CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS



As independent public accountants, we hereby consent to the incorporation by
reference in this registration statement on Form S-8 of our report dated
February 22, 2000, included in Dianon Systems, Inc.'s Form 10-K for the year
ended December 31, 1999, and to all references to our Firm included in this
registration statement and related prospectus documents.


                                                 ARTHUR ANDERSEN LLP




Stamford, Connecticut
March 31, 2000