EXHIBIT 99.1

Certification of CEO and CFO Pursuant to

18 U.S.C. Section 1350,

As Adopted Pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report of SangStat Medical Corporation (the “Company”) on Form 10-Q for the period ending June 30, 2002 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Jean-Jacques Bienaimé, as Chief Executive Officer of the Company, and Stephen G. Dance, as Senior Vice President, Finance of the Company, each hereby certifies, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, to the best of his knowledge, that:

(1)           The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)           The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

/s/ Jean-Jacques Bienaimé

Jean-Jacques Bienaimé

Chief Executive Officer

August 13, 2002

/s/ Stephen G. Dance

Stephen G. Dance

Senior Vice President, Finance

August 13, 2002

This certification accompanies this Report pursuant to § 906 of the Sarbanes-Oxley Act of 2002 and shall not be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.