human chorionic gonadotropin n a glycoprotein hormone similar in structure to luteinizing hormone that is secreted by the placenta during early pregnancy to maintain corpus luteum function and stimulate placental progesterone production, is found in the urine and blood serum of pregnant women, is commonly tested for as an indicator of pregnancy, is used medically to induce ovulation and to treat male hypogonadism and cryptorchidism, and is produced in certain cancers (as of the testes) abbr. HCG
Medical dictionary. 2011.