Rh blood-group incompatibility

an antigen-antibody reaction that occurs when blood from an Rh-positive individual is mixed with blood from an Rh-negative individual (see Rh factor) during transfusion or pregnancy. In pregnancy, this arises if an Rh-negative mother bears a child that has inherited Rh-positive blood: The fetal Rh antigens pass through the placental membrane, and maternal antibodies react through the placenta to destroy the fetal red blood cells. The damaged blood cells yield bilirubin, which a fetus cannot detoxify, and kernicterus may result. Also called Rh reaction.

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Psychology term of the day

December 25th 2024

conceptual system

the organization of a person’s cognitive abilities, emotional awareness, experience, and philosophical or religious orientation into a system for understanding events, data, or experience. See also cognitive structure; frame.