title: Increased maternal serum free beta-human chorionic gonadotrophin concentrations in Down's pregnancies: an artefactual finding?
authors.affiliation: Department of Obstetrics, University Hospital, Zurich, Switzerland.
authors.forename: R
authors.initials: R
authors.lastname: Zimmermann
authors.forename: P J
authors.initials: PJ
authors.lastname: Keller
authors.forename: A
authors.initials: A
authors.lastname: Huch
mesh_terms: D016477:Artifacts; D015415:Biomarkers / Q000097:blood; D006063:Chorionic Gonadotropin / Q000097:blood*; D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*; D013997:Time Factors
chemical_list: D015415:Biomarkers; D006063:Chorionic Gonadotropin