Exhibit 23.1



CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent public accountants, we hereby consent to the incorporation by
reference in this registration statement on Form S-4 of our reports dated
February 14, 2001, included in DIANON Systems, Inc.'s Form 10-K for the year
ended December 31, 2000, and to all references to our firm with respect to
DIANON Systems, Inc. included in this registration statement and related
prospectus document.

/s/ Arthur Andersen LLP

Stamford, Connecticut
October 10, 2001