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Erschienen in: Pediatric Radiology 4/2018

01.04.2018 | Minisymposium: Fetal/neonatal imaging

Have we done our last amniocentesis? Updates on cell-free DNA for Down syndrome screening

verfasst von: Kathryn J. Gray, Louise E. Wilkins-Haug

Erschienen in: Pediatric Radiology | Ausgabe 4/2018

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Abstract

Prenatal aneuploidy screening changed significantly in 2012 when cell-free fetal deoxyribonucleic acid (DNA) was introduced as a noninvasive prenatal test. A noninvasive prenatal test detects cell free fragments of fetal DNA from the placenta circulating in maternal blood that coexist with cell-free DNA (cfDNA) of maternal origin. Using next-generation sequencing, the noninvasive prenatal test compares maternal and fetal cfDNA ratios for chromosomes of interest (i.e., 21, 18, 13, X, and Y) to assess chromosomal aneuploidy. Compared to traditional screening using ultrasound and serum markers, the noninvasive prenatal test has superior test characteristics, including a higher detection rate and positive predictive value, and a lower false-positive rate. The noninvasive prenatal test is already used for primary screening in high-risk women and is rapidly expanding to all women. Given its increasing use, understanding the noninvasive prenatal test’s limitations is critical. Discordant results (i.e. noninvasive prenatal test is positive for aneuploidy with a normal fetal karyotype) can occur because of biological processes such as aneuploidy confined to the placenta, a vanished twin, maternal aneuploidy or maternal cancer. Use of the noninvasive prenatal test for screening beyond the most common aneuploidies is not recommended. The noninvasive prenatal test is a major advance in prenatal aneuploidy screening but it is not diagnostic and does not replace invasive testing (i.e. chorionic villous sampling or amniocentesis) for confirmation of fetal chromosomal disorders.
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Metadaten
Titel
Have we done our last amniocentesis? Updates on cell-free DNA for Down syndrome screening
verfasst von
Kathryn J. Gray
Louise E. Wilkins-Haug
Publikationsdatum
01.04.2018
Verlag
Springer Berlin Heidelberg
Erschienen in
Pediatric Radiology / Ausgabe 4/2018
Print ISSN: 0301-0449
Elektronische ISSN: 1432-1998
DOI
https://doi.org/10.1007/s00247-017-3958-y

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