A universal donor blood to someone who can donate with a few rare exceptions. The blood type O are universal donors -. In contrast, a universal recipient can safely take blood from someone, then with some rare exceptions. People with AB + blood are considered universal donors recipients.Universal ABO blood typing system are determined by. A, B, AB and O blood antigens present in the blood determined by the type: Under this system, people can be divided into four types of blood. In the case of people with the blood, the antigens are present. Type B blood have B antigens, type AB blood has both, and type O has no antigens. Some people "null" or 0 in the O group as the group refers to the fact, that an antigen refers to a type A blood donor blood present.If someone is a B, with the recipient's blood antigens will react in the B blood, transfusion trigger rejecting a transfusion reaction. O blood, however, secured with a blood type can be given to anyone, because there are antigens in donor blood react with the recipient's body.
