title: Failure of human pregnancy after implantation.
mesh_terms: D000022:Abortion, Spontaneous; D006063:Chorionic Gonadotropin / Q000097:blood / Q000652:urine; D010064:Embryo Implantation; D047108:Embryonic Development; D005260:Female; D006801:Humans; D011247:Pregnancy; D014463:Ultrasonography
chemical_list: D006063:Chorionic Gonadotropin