Human blood group antigens

Human blood group antigens are specific molecules found on the surface of red blood cells that determine a person's blood type. These antigens, like A, B, and Rh (D), are inherited and serve as markers distinguishing different blood groups. When blood transfusions occur, matching these antigens between donor and recipient is crucial to prevent immune reactions, as the body may attack unfamiliar antigens. Beyond transfusions, blood group antigens can influence susceptibility to certain diseases and play roles in pregnancy. Overall, they are key elements in ensuring safe and compatible blood exchanges.