EXHIBIT 32.1

                             OFFICERS' CERTIFICATION

      Each of the undersigned hereby certifies in his capacity as an officer of
Diagnostic Products Corporation ("DPC") that the Quarterly Report of DPC on Form
10-Q for the quarter ended March 31, 2004, fully complies with the requirements
of Section 13(a) of the Securities Exchange Act of 1934 and that the information
contained in such report fairly presents, in all material respects, the
financial condition of DPC at the end of such period and the results of its
operations for such period.

Dated May 10, 2004                   /S/ Michael Ziering
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                                        Michael Ziering, Chief Executive Officer

                                       /S/ James L. Brill
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                                        James L. Brill, Chief Financial Officer