An antigenic mismatch between donor and recipient blood. Antibodies present in the recipient's serum may be directed against antigens in the donor product. Such a mismatch may result in a transfusion reaction in which, for example, donor blood is hemolyzed. (From Saunders Dictionary & Encyclopedia of Laboratory Medicine and Technology, 1984).

Synonyms: Group Incompatibility, Blood, Incompatibilities, Blood Group, Blood Group Incompatibilities, Group Incompatibilities, Blood, Blood Group Incompatibility, Incompatibility, Blood Group