The Platelet Antibody test identifies platelet antibodies, aiding in diagnosing thrombocytopenia linked with autoimmune disorders and platelet transfusion compatibility concerns. Platelet autoantibodies form when individuals develop sensitivities to platelet antigens in transfused blood, leading to the destruction of donor and recipient platelets. This test evaluates conditions like drug-induced immunologic thrombocytopenia, idiopathic thrombocytopenic purpura, and posttransfusion purpura.