Detection of Down's syndrome.
D004314:Down Syndrome / Q000175:diagnosis / Q000000981:diagnostic imaging* / Q000196:embryology; D005333:Fetus / Q000033:anatomy & histology; D006801:Humans; D009666:Nose / Q000000981:diagnostic imaging* / Q000196:embryology*; D012680:Sensitivity and Specificity; D016216:Ultrasonography, Prenatal