Detection of Platelet Antibodies by a Newly Developed Mixed Agglutination with Platelets

We have developed a mixed passive haemagglutination test for the detection of platelet antibodies. This test is essentially a combination of a modified test of mixed agglutination and reversed passive haemagglutination. Using this test, platelet allo‐antibodies (HLA antibodies and non‐HLA antibodies) were found to be detected with very high sensitivity in the sera of pregnant women and transfused patients. The platelet crossmatch test was performed for patients who had to receive massive platelet transfusion. There was a good correlation between the result of the crossmatch and clinical platelet recovery.