![]() There are more than 30 other known blood groups and more than 600 antigens.īlood type is a genetic trait. Some people, including those with Rhnull blood, lack one or more common antigens. For example, a person with AB blood and Rh factor has AB+ blood. A person without Rh factor has Rh- blood, while someone with it has Rh+ blood. ![]() ![]() In addition to the blood group type, a person may also carry Rh factor on their red blood cells. People with both A and B antigens have type AB blood, while people with neither antigen on their red blood cells have type O blood. Most blood types fall into one of four blood type groups, according to whether they contain A or B antigens.įor example, people with A antigens have type A blood, while those with B antigens have type B blood. One Iranian woman with Rhnull blood had several pregnancy losses. For example, if their blood is incompatible with a developing fetus, pregnant women with rare blood types may experience complications. Having a rare blood type can make it difficult or even impossible to get a blood transfusion or organ transplant. The American Red Cross define a blood type as “rare” when it occurs in fewer than 1 in 1,000 people. Share on Pinterest Rhnull is the rarest blood type.
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