title: Absence of nasal bone and detection of trisomy 21.
authors.forename: Helle
authors.initials: H
authors.lastname: Hjalgrim
authors.forename: Johanne M
authors.initials: JM
authors.lastname: Hahnemann
authors.forename: Inger
authors.initials: I
authors.lastname: Kjaer
authors.forename: Karen
authors.initials: K
authors.lastname: Broendum-Nielsen
mesh_terms: D004314:Down Syndrome / Q000000981:diagnostic imaging* / Q000473:pathology; D005260:Female; D005333:Fetus / Q000002:abnormalities* / Q000473:pathology; D005600:Fragile X Syndrome / Q000000981:diagnostic imaging / Q000473:pathology; D005865:Gestational Age; D006801:Humans; D009295:Nasal Bone / Q000000981:diagnostic imaging* / Q000473:pathology; D011247:Pregnancy; D011859:Radiography