title: Early detection of implantation using a radioimmunoassay specific for human chorionic gonadotropin.
mesh_terms: D006063:Chorionic Gonadotropin / Q000097:blood*; D010064:Embryo Implantation; D005260:Female; D006801:Humans; D011247:Pregnancy; D011863:Radioimmunoassay
chemical_list: D006063:Chorionic Gonadotropin