[Interphase FISH test as a rapid test for trisomies in amniotic fluid--results of a prospective study].

Abstract:

BACKGROUND:Specific DNA probes allow rapid prenatal diagnosis of numerical chromosome disorders (chromosomes 13, 18, 21, X, Y) by FISH on interphase nuclei. The diagnostic reliability is presently under evaluation. STUDY GROUP:In a period of 1.5 years a total 1126 amniotic fluid samples was investigated by FISH compared to standard cytogenetic analysis. RESULTS:The success rate was 93 percent (< or = 30 nuclei) and 84% (< or = 50 nuclei). An abnormal karyotype was detected by FISH in 27 of 28 successfully hybridised samples, including trisomy 21 [16], trisomy 13 [4], trisomy 18 [4], aberrations of sex chromosomes [4]. Two cases with clinically relevant cytogenetic abnormalities were in principle not detectable by FISH. One false-negative finding was observed, possibly arising from maternal cell contamination of the sample. 6% of all samples, respectively 23% of the bloody samples were contaminated by maternal cells (more than 10%). CONCLUSION:Maternal contamination represents the most important limitation of the diagnostic reliability in routine practice.

authors

Bink K,Pauer HU,Bartels I

doi

10.1055/s-2000-10189

subject

Has Abstract

pub_date

2000-01-01 00:00:00

pages

8-13

issue

1

eissn

0948-2393

issn

1439-1651

journal_volume

204

pub_type

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