Topic overview

Start with the big picture

Safe allogeneic transfusion begins with ABO/Rh typing, an antibody screen, and a crossmatch. Component selection depends on what the patient needs: packed red blood cells support oxygen-carrying capacity, platelets address low platelet counts or bleeding risk, fresh frozen plasma supplies soluble clotting factors, and cryoprecipitate provides fibrinogen and selected proteins. The topic also covers storage conditions, compatibility concepts, pretransfusion modifications, and balanced support during massive transfusion. Safety extends beyond product selection: acute reactions include hemolysis, allergic responses, TRALI, and TACO, while delayed complications include alloantibody-related hemolysis, infections, iron overload, and TA-GVHD. Understanding these categories provides a framework for recognizing why each product or precaution is used and what complications require attention.