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Hemolytic disease of the newborn (HDN) is a disease in which there is hemolysis in a newborn or fetus caused by blood-group incompatibility between mother and child. There are a bunch of related terms: Immune hydrops (Hydrops means accumulation of edema fluid in the fetus during intrauterine growth.
1 During pregnancy, most of the hCG in the blood is intact hCG. 2  Nicked hCG (hCGn): Nicked hCG is made when a chemical bond in part of the beta subunit is broken. The beta subunit is unique to just hCG (the other three hormones also have their own unique beta subunit). 2  A complete, intact hCG molecule is made when the alpha and beta subunits are attached to each other. 3  During pregnancy, most of the hCG in the blood is intact hCG.