title: Choriogonadotropin and pregnancy testing: prozone phenomenon defined.
mesh_terms: D006063:Chorionic Gonadotropin / Q000032:analysis*; D005188:False Negative Reactions; D005260:Female; D006801:Humans; D011247:Pregnancy; D011259:Pregnancy Tests, Immunologic
chemical_list: D006063:Chorionic Gonadotropin