platelet antigen

platelet antigen

Transfusion medicine An antigen on the surface of platelets that may evoke production of antibodies, causing neonatal alloimmune thrombocytopenia and post-transfusion purpura, most commonly as a reaction to the P1A1 antigen in P1A1 antigen-negative recipients; other PAs causing purpura include PlA2, HLA-A2 and Baka