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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.
10 most extreme places on Earth. Human chorionic gonadotropin (HCG) is a hormone produced when women are pregnant, and in some rare instances when certain tumors develop. In most cases, pregnancy tests look for the presence of this hormone.nitially when a woman gets pregnant, the fetus produces human chorionic gonadotropin, and then later the placenta produces it. For the pregnant woman, the production of HCG is vital to maintaining the pregnancy.