title: Maternal serum screening for Down syndrome before 15 weeks.
authors.forename: H
authors.initials: H
authors.lastname: Cuckle
authors.forename: R
authors.initials: R
authors.lastname: Lilford
authors.forename: R
authors.initials: R
authors.lastname: Jones
mesh_terms: D006063:Chorionic Gonadotropin / Q000097:blood; D018997:Chorionic Gonadotropin, beta Subunit, Human; D004314:Down Syndrome / Q000175:diagnosis*; D004964:Estriol / Q000097:blood*; D005260:Female; D006801:Humans; D010446:Peptide Fragments / Q000097:blood; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011296:Prenatal Diagnosis / Q000379:methods*; D000509:alpha-Fetoproteins / Q000032:analysis*
chemical_list: D006063:Chorionic Gonadotropin; D018997:Chorionic Gonadotropin, beta Subunit, Human; D010446:Peptide Fragments; D000509:alpha-Fetoproteins; D004964:Estriol