To do rapid testing for incomplete antibody in the process of blood matching, a more suitable incomplete antibody rapid agglutinant(IRAT) and a neutralizer used in combination with IRAT were developed. The former consisted of protamine, dextran, albumin and EDTA, while the latter consisted of sodium citrate, albumin and NaCl. The method of using the agglutinant and neutralizer in testing for incomplete antibody was briefly called as IRAT method. It took 3 minutes for the method to give test result. IRAT method could be used in blood matching blood grouping aud in testing the IgG for anti-A and anti-B. Preliminary comparative observations of testing for incomplete antibody in patients with AIHA by IRTA and immediate Coombs test gave basically consistent results (Original article on page 9)