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FAQ027, September 2013

What is the Rh factor? Just as there are different major blood groups, such as type A and type B, there also is an Rh factor. The Rh factor is a protein that can be present on the surface of red blood cells. Most people have the Rh factor—they are Rh positive. Others do not have the Rh factor—they are Rh negative.


American Congress of Obstetricians and Gynecologists
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