Larry
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The rarest blood type is AB-. About half a percent of people worldwide share this type of blood, which is one in about two hundred people. People with the AB blood type can receive blood from others with either O, A, or B type blood. They can only give blood to others with the AB type. A negative Rh factor donor can give blood to either a positive or negative Rh factor recipient, but someone with AB- blood can only receive O-, A-, B- or AB- blood.
There are a couple reasons this type is so uncommon. The negative Rh factor occurs in about ten percent of the world's population. The other reason is it takes parents with A, B, or AB blood in the proper combination to give the child neither Anti-A or Anti-B antibodies for the type. The parents might have A and B blood type and the child could still end up with O type blood. Getting an AB- blood type is a little like winning the genetic lottery.
About forty percent of the population has type O blood, thirty two percent has type A, twenty two percent has type B, and six percent has AB. The ABO and Rh systems are the most commonly known, but the International Society of Blood Transfusion does recognize other types though many are found in certain ethnic groups or in a very small percentage of the population.
 Posted 5227 day ago
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