However, Rh-null can only accept blood from others with Rh-null. Rh-null occurs when a person’s blood lacks all of the 61 possible antigens.īecause Rh-null lacks all of the possible antigens it can be donated to others who have highly unusual blood types outside of the main eight types. While there are only eight main/common blood types, there are an additional 61 possible antigens in the Rh system, which means that the eight main blood types can be subdivided into millions of different blood types. Rh-null aka “Golden Blood” is the rarest blood type in the world with fewer than 50 (43 to be exact) known cases ever reported. Photo source: Wikimedia Commons via Sémhur Plasma Compatibility (Can Donate To): Unspecified CMV is a flu-like virus that most adults have been exposed to at some time in their life and while CMV antibodies, which remain in the blood forever like all viruses, are safe for adults, they can be fatal to babies.ĭistribution Among World Population: Fewer than 50 individualsĬan Donate T: Rh-null (can also be given to other unusual blood types) Did You Know?Īlthough O- blood is already very special, O- donors who are CMV (Cytomegalovirus) negative are extra special because their blood is safe to give to babies. According to the American Red Cross, O- blood is the always the first to run out during a blood shortage due to its universality. Unfortunately, O- blood is pretty uncommon and because of how important the blood is, donors are in very high demand around the world. O- blood is used often in transfusions when the recipient’s blood type is unknown, like during trauma or emergency situations. Did You Know?Īlthough both O+ and O- blood are used most often when an individual’s blood type is unknown, during traumas hospitals prefer to transfuse O+ blood over O- because the risk of reaction is much lower in ongoing blood loss situations and because hospitals have more O+ blood than O-.ĭistribution Among World Population: 2.55%Īs the “universal donor,” O- blood is perhaps the most valuable blood in the world as it can be given to nearly any blood type (except when the person has some rare antigen outside of the main ones). However, O blood types can be given plasma from anyone. ![]() When it comes to plasma, O blood, both positive and negative, is not so universal and they can only give plasma to other O types. While O+ blood can be given to anyone with Rh positive blood types, individuals can only receive blood from O+ and O- donors. Additionally, Rh positive blood types are much more common than Rh negative blood types, which is another reason why O+ blood is always needed and important. O+ blood is the most common blood type in the world and while it is not quite as universal as O- blood (O+ can be given to all Rh positive types but not the Rh negative types), it is still the most used blood, according to the American Red Cross. Distribution Among World Population: 38.67%
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