anti D

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anti D n. the rhesus-factor antibody, formed by rhesus-negative individuals following exposure to rhesus-positive blood. Anti-D immunoglobulin (anti-D Ig) is administered to Rh-negative women within 72 hours of giving birth to a Rh-positive child (or following miscarriage or abortion) to prevent the risk of haemolytic disease of the newborn in a subsequent child.