title: Appropriate terminology for free beta-hCG.
authors.forename: T W
authors.initials: TW
authors.lastname: Hallahan
authors.forename: D A
authors.initials: DA
authors.lastname: Krantz
mesh_terms: D018997:Chorionic Gonadotropin, beta Subunit, Human; D005260:Female; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis; D009626:Terminology as Topic; D014314:Trisomy / Q000175:diagnosis / Q000235:genetics
chemical_list: D018997:Chorionic Gonadotropin, beta Subunit, Human