<PAGE>
EXHIBIT 23.1
INDEPENDENT AUDITORS' CONSENT
We consent to the incorporation by reference in Registration Statements No.
33-77132, 33-84042 and 333-96205 of IGEN International, Inc. on Form S-8
dated March 31,1994, Form S-8 dated September 15, 1994 (Amended December 31,
1996) and Form S-3 dated February 4, 2000 of our report dated May 12, 2000,
appearing in this Annual Report on Form 10-K of IGEN International, Inc. for
the year ended March 31, 2000.
DELOITTE & TOUCHE LLP
McLean, Virginia
June 29, 2000
