title: Truncation limits for CT marker ratios in prenatal screening for Down syndrome.
authors.forename: Nicholas J
authors.initials: NJ
authors.lastname: Wald
authors.forename: Jonathan P
authors.initials: JP
authors.lastname: Bestwick
authors.forename: Joan K
authors.initials: JK
authors.lastname: Morris
mesh_terms: D000328:Adult; D015415:Biomarkers / Q000097:blood; D004314:Down Syndrome / Q000097:blood / Q000175:diagnosis* / Q000191:economics / Q000196:embryology*; D023381:Endpoint Determination / Q000379:methods*; D005189:False Positive Reactions; D005260:Female; D005865:Gestational Age; D006801:Humans; D016013:Likelihood Functions; D011237:Predictive Value of Tests; D011247:Pregnancy; D011261:Pregnancy Trimester, First / Q000097:blood; D011262:Pregnancy Trimester, Second / Q000097:blood; D011296:Prenatal Diagnosis / Q000191:economics / Q000379:methods*
chemical_list: D015415:Biomarkers