Alloantibody

An alloantibody is a type of antibody in your immune system that develops in response to foreign proteins from members of the same species, often after blood transfusions, organ transplants, or pregnancy. These antibodies recognize and attack these foreign proteins, which can lead to complications like rejection of transplanted organs or hemolytic reactions if incompatible blood is transfused. Alloantibodies are part of your body's natural defense mechanism, but their presence can pose challenges in medical procedures, making compatibility testing essential to prevent adverse reactions.