The Warsaw Treaty Organization (also known as the Warsaw Pact) was a political and military alliance established on May 14, 1955 between the Soviet Union and several Eastern European countries.
1 Donors with blood type A... can donate to recipients with blood types A and AB. 2  Donors with blood type B... can donate to recipients with blood types B and AB.  Donors with blood type AB...
The donor's blood type must be compatible with your blood type for the transplant to go well. You should know your blood type and determine which blood types are compatible with yours so you can check to see if a donor will be a match. Type O blood types can donate to type O, A, B, and AB.