title: [Rapid prenatal diagnosis of Down's syndrome in the first trimester of pregnancy by fluorescence in situ hybridization].
abstract: OBJECTIVE
  To assess whether fluorescence in situ hybridization (FISH) with chromosome 21, specific DNA probe is applicable as a prenatal diagnostic tool for Down's syndrome.
  
  
  METHODS
  We used FISH with chromosome 21 specific probe on 30 uncultured chorionic villi cell samples to detect the Down's fetus, and we also performed the conventional chromosome analysis of chorion cells from parallel samples.
  
  
  RESULTS
  In samples with disomic karyotype, an average of 1 percent (0-5 percent) of the nuclei had three hybridization signals. By contrast, in the samples of trisomy 21 fetus, an average of 86 percent (78-91 percent) of the nuclei displayed three signals.
  
  
  CONCLUSIONS
  FISH can provide a rapid and accurate method for the first trimester prenatal diagnosis of Down's syndrome.
authors.affiliation: Peking Union Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing.
authors.forename: Y
authors.initials: Y
authors.lastname: Xiang
authors.forename: N
authors.initials: N
authors.lastname: Sun
authors.forename: F
authors.initials: F
authors.lastname: Wang
mesh_terms: D015193:Chorionic Villi Sampling; D002891:Chromosomes, Human, Pair 21; D004314:Down Syndrome / Q000175:diagnosis* / Q000235:genetics; D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis* / Q000235:genetics; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007621:Karyotyping; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D018566:Pregnancy, High-Risk; D011296:Prenatal Diagnosis / Q000379:methods*