Study examines issues related to prenatal detection of trisomies

Cell-free (cf) DNA analysis of maternal blood for trisomies 21, 18 and 13 is superior to other methods of screening, but it's expensive. One strategy to maximize cfDNA testing at reduced cost is to offer it contingent on the results of the currently used first-trimester test.

A new study in Ultrasound in Obstetrics & Gynecology found that such contingent screening could potentially lead to detection of a higher proportion of affected pregnancies; however, prenatal detection of trisomies depends not only on performance of screening tests but also on parental choices.

Only 60% of women considered high-risk after undergoing standard first trimester screening chose to undergo cfDNA testing. Consequently, adding cfDNA testing may only have a small effect on the rate of live births with trisomy 21.


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More information: M. M. Gil et al. Clinical implementation of routine screening for fetal trisomies in the UK NHS: cell-free DNA test contingent on results from first-trimester combined test, Ultrasound in Obstetrics & Gynecology (2015). DOI: 10.1002/uog.15783
Journal information: Obstetrics & Gynecology

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Citation: Study examines issues related to prenatal detection of trisomies (2015, November 4) retrieved 22 October 2019 from https://medicalxpress.com/news/2015-11-issues-prenatal-trisomies.html
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