Blood group system

Blood group systems classify human blood based on specific markers, called antigens, present on the surface of red blood cells. These antigens, such as the well-known ABO and Rh systems, determine compatibility for blood transfusions. If someone receives incompatible blood, their immune system may attack the transfused cells, causing serious reactions. Understanding blood groups helps ensure safe transfusions, prevent complications during pregnancy, and guide medical treatments. In essence, blood group systems are a way the body’s cells identify themselves, maintaining safety and compatibility in blood-related procedures.