title: The use of free beta-hCG in antenatal screening for Down's syndrome.
authors.forename: K
authors.initials: K
authors.lastname: Spencer
authors.forename: J N
authors.initials: JN
authors.lastname: Marcri
mesh_terms: D006063:Chorionic Gonadotropin / Q000097:blood*; D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*; D012015:Reference Standards
chemical_list: D006063:Chorionic Gonadotropin