... :Human Chorionic Gonadotropin (HCG)) is a glycoprotein hormone secreted by the developing placenta shortly after fertilization. During normal pregnancy, ... every 1.3 to 2 days. At the time of the last missed menstrual period, urine HCG levels are about ... gestational growth make it an ideal marker for the early detection of pregnancySpecification: 1) HCG10A, HCG11A, HCG12A, HCG20A, HCG13A, HCG 23A ...