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Meaning of RH FACTOR

WordNet Dictionary
[n]  a blood group antigen possessed by Rh-positive people; if an Rh-negative person receives a blood transfusion from an Rh-positive person it can result in hemolysis and anemia
 Synonyms: Rh, rhesus factor
 See Also: antigen



Medical Dictionary
 Definition: A blood factor located in red blood cells. Eighty-five percent of the population carry the blood factor and are Rh positive. Fifteen percent are missing the factor from their blood cells and are Rh negative.
Biology Dictionary
 Definition: An antigen that may or may not be present on the surface of human blood cells. If a person's blood has the antigen, their blood type is "positive"; if they do not, it is "negative." The Rh factor is important mainly because if a woman who is Rh- conceives a child who is Rh+, the mixing of their bloods in the placenta may provoke an immune reaction in the mother that can cause a life-threatening agglutination of the fetus' blood cells.

The Rh factor is so named because it was first identified in Rhesus monkeys. See also ABO blood group.