CERTIFICATION 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  ThermoGenesis  Corp. (the "Company")
on Form 10-Q for the period  ending March 31, 2004 as filed with the  Securities
and Exchange Commission on the date hereof (the "Report"), We, Philip H. Coelho,
Chief Executive Officer and Renee M. Ruecker,  Chief Financial  Officer,  of the
Company,  certify,  pursuant to 18 U.S.C.  Section 1350, as adopted  pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge
and belief:

          (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.


Dated:  May 12, 2004             /s/Philip H. Coelho
                                 ----------------------------
                                 Philip H. Coelho,
                                 Chief Executive Officer
                                 (Principal Executive Officer)



                                 /s/Renee M. Ruecker
                                 ----------------------------
                                 Renee M. Ruecker,
                                 Chief Financial Officer
                                 (Principal Financial and Accounting Officer)