title: Measuring serum markers once or twice in each assay in antenatal screening for Down syndrome and neural tube defects.
authors.forename: A K
authors.initials: AK
authors.lastname: Hackshaw
authors.forename: N J
authors.initials: NJ
authors.lastname: Wald
authors.forename: L M
authors.initials: LM
authors.lastname: George
mesh_terms: D015415:Biomarkers / Q000097:blood*; D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D006801:Humans; D009436:Neural Tube Defects / Q000175:diagnosis*; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*; D011786:Quality Control
chemical_list: D015415:Biomarkers