title: Early detection of Down's syndrome using free beta human choriogonadotropin.
authors.affiliation: Clinical Biochemistry Department, Oldchurch Hospital, Romford, Essex, UK.
authors.forename: K
authors.initials: K
authors.lastname: Spencer
authors.forename: J N
authors.initials: JN
authors.lastname: Macri
mesh_terms: D000328:Adult; D006063:Chorionic Gonadotropin / Q000097:blood*; D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*; D000509:alpha-Fetoproteins / Q000032:analysis
chemical_list: D006063:Chorionic Gonadotropin; D000509:alpha-Fetoproteins