What is rh^+ and rh^- ?
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The terms Rh factor, Rh positive, and Rh negative refer to the Rh(D) antigen only. Antibodies to Rh antigens can be involved in hemolytic transfusion reactions and antibodies to the Rh(D) and Rh(c) antigens confer significant risk of hemolytic disease of the fetus and newborn.
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Any of a type of specific antigen present on the surface of RBC,persons having inherited such antigens being designated Rh+ and persons lacking them,a much smaller group, being designated Rh-.blood of Rh- persons blood is incompatible with Rh+ blood because of antibody reactions.
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