title: Clinical experience of noninvasive prenatal testing with cell-free DNA for fetal trisomies 21, 18, and 13, in a general screening population.
abstract: OBJECTIVE
  Evaluate noninvasive prenatal testing (NIPT) with cell-free DNA as a screening method for trisomies 21, 18, and 13 in an obstetrical clinical practice setting.
  
  
  METHODS
  Observational study of pregnant women who underwent prenatal screening for fetal trisomy from 30 July 2012 to 1 December 2012. NIPT was offered to all patients in addition to first trimester combined screening (FTS).
  
  
  RESULTS
  The cohort included 289 women with mean age of 32.3 years (range: 17.8-42.0) who underwent testing at 13.0 gestational age weeks (range: 10.1-20.7). NIPT results were provided for 98.6% of patients at a mean reporting time of 9.3 calendar days. With NIPT, all patients had a risk less than 1:10 000 for trisomy 21, 18, or 13. With FTS, 4.5% of patients had screening results indicating an increased risk for trisomy 21. One patient who had an elevated trisomy 21 risk with FTS elected to have an amniocentesis, which revealed a euploid fetus.
  
  
  CONCLUSIONS
  NIPT has the potential to be a highly effective screening method as a standard test for risk assessment of fetal trisomies 21, 18, and 13 in general pregnant populations.
authors.affiliation: Obstetrics and Gynecology of Atlanta, Atlanta, GA, USA.
authors.forename: Genevieve
authors.initials: G
authors.lastname: Fairbrother
authors.forename: Shayla
authors.initials: S
authors.lastname: Johnson
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Musci
authors.forename: Ken
authors.initials: K
authors.lastname: Song
mesh_terms: D000293:Adolescent; D000328:Adult; D002882:Chromosomes, Human, Pair 13; D002887:Chromosomes, Human, Pair 18; D002891:Chromosomes, Human, Pair 21 / Q000235:genetics*; D004247:DNA / Q000097:blood / Q000235:genetics; D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods* / Q000706:statistics & numerical data; D012189:Retrospective Studies; D014314:Trisomy / Q000175:diagnosis*; D055815:Young Adult
chemical_list: D004247:DNA