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Diagnostic Accuracy of Noninvasive Detection of Fetal Trisomy 21 in Maternal Blood: A Systematic ReviewVerweij E.J.a · van den Oever J.M.E.b · de Boer M.A.a · Boon E.M.J.b · Oepkes D.a
aDepartment of Obstetrics and bCenter for Human and Clinical Genetics, Leiden University Medical Centre, Leiden, The Netherlands Corresponding Author
Department of Obstetrics, Leiden University Medical Centre
PO Box 9600
NL–2300 RC Leiden (The Netherlands)
Tel. +31 71 526 2896, E-Mail email@example.com
Background: Both pregnant women and providers of obstetric care are aware of the rapid advances in noninvasive prenatal diagnosis (NIPD) of fetal trisomies, and appear to look forward to its clinical introduction. Objectives: To review and critically assess the published literature on diagnostic accuracy of NIPD using cell-free fetal DNA or RNA in maternal blood to detect fetal trisomy 21. Method: An electronic search was performed in MEDLINE, EMBASE and the Cochrane library (1997 to April 2011). Of a total of 201 citations, 9 studies were eligible for full-text analysis by 2 independent reviewers, using the QUADAS tool. Results: Two of the 9 analyzed studies complied with the criteria of the QUADAS tool. Combining the selected 2 studies, with a total of 681 pregnancies included, overall sensitivity was 125/125 (100%, 95% CI 97.5–100%) and specificity 552/556 (99.3%, 95% CI 98.7–99.3%). Conclusions: NIPD of fetal trisomy 21, using fetal nucleic acids in maternal plasma, appears to have a high diagnostic accuracy. Large-scale prospective studies are awaited before implementation in clinical practice.
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