Summary:
- Blood type is a way to describe the type of antigens, or proteins, on the surface of red blood cells (RBCs) There are four blood types; A, B, AB, and O.
- A blood transfusion is the process of putting blood or blood products from one person into the circulatory system of another person.
- The blood type of the recipient needs to be carefully matched to the blood types of the donor.
- The second most important blood group system is the Rhesus (Rh) factor.