Exhibit 23 CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS We consent to the incorporation by reference in Registration Statement No. 333-100878 of E-Z-EM, Inc. on Form S-8 of our report dated July 25, 2003, appearing in the Annual Report on Form 10-K of E-Z-EM, Inc. and Subsidiaries for the fifty-two weeks ended May 31, 2003. /s/ GRANT THORNTON LLP Melville, New York August 25, 2003 -95-