Human chorionic gonadotropin is a maternal recognition hormone, usually produced by trophoblast cells that surrounds a growing embryo, which forms placenta after implantation. The average hCG level in pregnant women’s blood is 6-70 IU/L (3weeks). In molar pregnancy the hCG level is greater than 100,000 IU/L. This hCG level is higher than normal, and indicates the condition of molar pregnancy.