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Although it might one day be possible, doctors cannot currently change a person’s blood type. However, the researchers had to use very large quantities of the enzyme, and they did not test their theory in human participants. In theory, this would allow doctors to change a person’s blood type, potentially making it easier for them to get a transfusion. In 2015, researchers identified an enzyme that could “cut” antigens from blood cells. To be Rh-, the child must inherit two Rh- alleles. This means that if a child inherits one Rh+ allele and one Rh- allele, the child will have Rh+ blood. Parents pass on Rh factor in the same way. A parent who has O blood can only pass an O allele.Ī and B alleles are “ co-dominant.” This means that a child who inherits one of each will have AB blood.įor example, a mother with type A blood who passes on an A allele and a father with type B blood who passes on the B allele will have a child with AB blood. However, a child can have a different blood type to both of their parents, depending on which genes they inherit.Įach parent passes one allele (gene) for blood type to their child. 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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