BLOOD GROUPS AND RH FACTOR DETERMINANTS

Abstract

Blood group systems and the Rh factor are fundamental biological markers that connect genetics, immunology, transfusion medicine, obstetrics, emergency care, and laboratory diagnostics. Although the ABO and Rh systems are often taught as simple school-level classifications, their medical significance is much deeper: they determine red blood cell compatibility, influence transfusion safety, explain many hemolytic reactions, and help prevent hemolytic disease of the fetus and newborn. The results show that blood group knowledge should not be reduced to memorizing four letters and positive or negative signs. A defensible understanding requires attention to red cell antigens, naturally occurring antibodies, agglutination, crossmatching, RhD immunization, pregnancy-related incompatibility, and procedural error prevention. The article concludes that correct interpretation of blood groups and Rh factor is an essential safety competence for future medical professionals, because mistakes in identification, labeling, or compatibility assessment can lead to serious clinical consequences.