When donating blood type A+ blood is A blood type Rh blood group analysis is positive. 1. The two most important blood group systems in the clinic are ABO and Rh blood groups. Normal human ABO blood group typing is divided into A, B, AB, O; Rh blood group is divided into positive and negative. (1) ABO blood groups are named according to the antigens expressed in the red blood cell membrane. Erythrocytes expressing A antigen are type A, with anti-B in the plasma; those expressing B antigen are type B, with anti-A in the plasma; those expressing both A and B antigens are type AB, with no anti-A and anti-B in the plasma; and those not expressing A and B antigens are type O, with anti-A and anti-B in the plasma. (2) Rh blood group system is based on the presence or absence of D antigen on red blood cells to distinguish between the blood type of people with D antigen is called Rh positive blood type, the lack of D antigen of people’s blood type for the Rh negative blood type. Rh system of blood group antigens in the clinical transfusion and hemolytic disease of the newborn has a very important significance. 2. A+ blood belongs to one kind of A blood type, which means that the blood cells contain A antigen and the Rh blood group analysis is positive, so it is called A Rh-positive blood. It is commonly used clinically as a guide during blood transfusion. Therefore, blood donors will be carefully typed when donating blood. Usually, you can know your blood type through blood test, and you need to clarify your blood type before transfusion.