The document discusses quality control of human chorionic gonadotropin (hCG), a hormone produced during pregnancy. It describes hCG's history, functions, production methods, purification processes, formulations, assays and related quality control tests to ensure the hormone's potency, purity and sterility. Some key points are that hCG can be extracted from urine of pregnant women or produced recombinantly, and its biological activity is determined using assays that measure effects on test animals.