Blood types compatibility chart

Blood type compatibility determines which blood donations are safe for different recipients, based on the presence of specific antigens (proteins) on red blood cells. The main blood groups are A, B, AB, and O, with each potentially having Rh-positive or Rh-negative. Type O negative is considered a universal donor because it lacks A, B, and Rh antigens, making it safe for all blood types. Conversely, AB positive is a universal recipient. Compatibility charts guide hospitals and donors to ensure safe transfusions, preventing immune reactions that can occur if incompatible blood types are mixed.