Human chorionic gonadotropin or human chorionic gonadotrophin (hCG) is a glycoprotein hormone produced in pregnancy that is made by the developing embryo after conception and later by the syncytiotrophoblast. But it is not known whether this production is a contributing cause or an effect of tumorigenesis. Description: Pregnant human urine. Alternative Names: Intact HCG Protein, Human Chorionic Gonadotropin Protein, HGC Antigen