title: Room for improvement? Detecting autosomal trisomies without serum screening.
abstract: OBJECTIVE
  To assess the efficacy of the prenatal screening and diagnostic programme for the detection of the common autosomal trisomies in the North West Thames region prior to the introduction of serum screening.
  
  
  METHODS
  A retrospective study based on reports made to the North West Thames Regional Health Authority Congenital Malformation Register.
  
  
  METHODS
  235 pregnancies of women delivered in units in the North West Thames region over a two-year period (1990-91) whose babies or fetuses were diagnosed as having Down, Edwards or Patau syndrome.
  
  
  RESULTS
  33% of Down syndrome, 68% of Edwards syndrome and 52% of Patau syndrome were diagnosed prenatally (before 28 weeks) in the region without the use of serum screening.
  
  
  CONCLUSIONS
  Using maternal age and routine ultrasound as screening methods, units in the region are prenatally diagnosing significantly fewer Down syndrome babies than are those in authorities using serum screening. The use of maternal age and ultrasound screening is more effective for the antenatal detection of the other autosomal trisomies than it is for the detection of Down syndrome. It is not yet clear to what extent serum screening might be expected to increase the detection rate for these conditions.
authors.affiliation: North West Thames Regional Congenital Malformation Register, Kennedy Galton Centre, Northwick Park Hospital, Harrow, Middlesex.
authors.forename: L
authors.initials: L
authors.lastname: Abramsky
authors.forename: J
authors.initials: J
authors.lastname: Chapple
mesh_terms: D000328:Adult; D002882:Chromosomes, Human, Pair 13; D002887:Chromosomes, Human, Pair 18; D004314:Down Syndrome / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000453:epidemiology; D005260:Female; D006801:Humans; D008403:Mass Screening / Q000379:methods / Q000592:standards*; D008423:Maternal Age; D011247:Pregnancy; D011256:Pregnancy Outcome; D012189:Retrospective Studies; D014314:Trisomy; D016216:Ultrasonography, Prenatal / Q000379:methods / Q000592:standards*