The administration of antibodies to a pregnant women with Rh⁻ blood is used to prevent

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Administering antibodies to a pregnant woman with Rh⁻ blood can prevent hemolytic disease of the newborn (HDN). HDN occurs when the mother's immune system produces antibodies against the Rh factor on the fetus's red blood cells, leading to their destruction and resulting in severe jaundice, anemia, and other complications. By administering Rh antibodies, the antibodies in the mother's system are bound up and prevented from attacking the Rh factor on the fetus's red blood cells, preventing or minimizing the effects of HDN.

The Administration of Antibodies to a Pregnant Women with Rh⁻