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...
, Hey, I like pugs. Yes, you can always donate to your same group and RH (positive or negative) The a,b,ab and o types marks the presence or abscense of a protein in your blood (a and/or b). So a has a protein only, b has b protein only, ab has both and o has none. The RH negative is absence of the factor and RH positive is presence of it.