title: Prenatal characteristics of false negative cases from first-trimester screening of Down syndrome (trisomy 21).
authors.forename: Tanja Schlaikjær
authors.initials: TS
authors.lastname: Simonsen
authors.forename: Steen
authors.initials: S
authors.lastname: Sørensen
authors.forename: Charlotte
authors.initials: C
authors.lastname: Ekelund
authors.forename: Finn Stener
authors.initials: FS
authors.lastname: Jørgensen
mesh_terms: D000328:Adult; D004314:Down Syndrome / Q000175:diagnosis*; D005188:False Negative Reactions; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D062145:Maternal Serum Screening Tests; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D055815:Young Adult