When O Bites Back: Unrecognized Acute Hemolytic Reaction from Out-of-Group HLA-Compatible Platelet Transfusion.

Managing a platelet blood product inventory in a hospital-based transfusion service (TS) is challenging. Thus, to optimize platelet inventory availability and to prevent excess outdating, most tertiary care center-based TSs do not require ABO-identical platelet (PLT) transfusions. To mitigate the risk of hemolysis associated with the transfusion of high titer ABO antibody-containing PLT, our institutional policy allows the transfusion of PLT containing ABO-incompatible plasma only if PLT is re-suspended in platelet additive solution (PAS).