Rh-positive blood type A means the presence of A antigens and a D blood group substance (antigen) on the patient’s red cell membrane. Blood type refers to the type of antigens on the surface of blood components (including red blood cells, white blood cells, and platelets). What is generally referred to as blood type refers to the type of specific antigens on the red blood cell membranes, and clinically, the most common are the ABO blood group system and the Rh blood group system. Rh-positive blood type A indicates that the patient has blood type A in the ABO blood group system, with only antigen A on the red blood cell membrane, and Rh-positive blood type in the Rh blood group system, with the presence of a D blood group substance (antigen) on the red blood cell membrane. Normally, the Rh blood type is Rh-positive, and only a small percentage of people are Rh-negative, which is called “panda blood.” Rh-negative patients can only receive Rh-negative blood for transfusion, and must undergo a cross-matching test prior to the transfusion, otherwise hemolysis may occur.