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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.
Human chorionic gonadotropin, or HCG, is a hormone which is produced during pregnancy. it is produced by the cells that form the placenta. The production of HCG starts immediately after the egg attaches itself to the uterine walls. It is very important to keep a regular check on HCG levels during pregnancy.