EXHIBIT 23.1


             CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS


     We consent to the reference to our firm under the caption "Experts" in
the Registration Statement (Form S-3 No. 333-46745) and related Prospectus of
ChemTrak Incorporated for the registration of 4,266,600 shares of its common
stock and to the incorporation by reference therein of our report dated
January 17, 1997, with respect to the financial statements of ChemTrak
Incorporated included in its Annual Report (Form 10-K) for the year ended
December 31, 1996, filed with the Securities and Exchange Commission.



                                                /S/ ERNST & YOUNG LLP

Palo Alto, California
May 21, 1998