The Problem of Platelet Autoantibodies

Abstract

To assess 2 modifications of the platelet factor 3 (PF3) test for [human] platelet antibody detection, an analysis of test conditions was performed with normal test material (serum, plasma, globulin fraction), defined HL-A-specific, complement-fixing antisera and a quinidine-induced antiserum. Under standardized conditions, the PF3 test revealed known platelet antibodies confirming earlier results. Its reproducibility and, to a lesser degree, its sensitivity were inferior to platelet complement fixation. The test did not permit the reliable determination of platelet autoantibodies in sera of 89 thrombocytopenic patients including 36 cases of idiopathic thrombocytopenic purpura. Positive results loosely corresponded to the presence of HL-A antibodies in sera.