{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,20]],"date-time":"2026-03-20T05:28:00Z","timestamp":1773984480394,"version":"3.50.1"},"reference-count":20,"publisher":"Wiley","issue":"7","license":[{"start":{"date-parts":[[2012,5,9]],"date-time":"2012-05-09T00:00:00Z","timestamp":1336521600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Prenatal Diagnosis"],"published-print":{"date-parts":[[2012,7]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:sec><jats:title>Objective<\/jats:title><jats:p>The aim of this study was to examine the effectiveness of a combination of parameters at first\u2010trimester screening for fetal aneuploidies, including ultrasound assessment of the nasal bone (NB), blood flow in the ductus venosus (DV) and flow across the tricuspid valve.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Screening for aneuploidy was carried out in 4172 singleton pregnancies between January 2006 and December 2010. Diagnostic accuracy of combined screening [inclusive of maternal age, fetal nuchal translucency (NT) thickness and maternal serum free beta\u2010human chorionic gonadotropin and pregnancy\u2010associated plasma protein A] and of secondary ultrasound markers [NB, tricuspid regurgitation (TR) and Doppler studies of the DV] obtained at the same visit was assessed using the receiver operating characteristic (ROC) curve analysis.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The individual areas under the ROC curves of NT, NB, DV or TR ranged between 0.7 and 0.8, representing acceptable discrimination. The area under the ROC curve of combined first\u2010trimester screening was 0.87, whereas the addition of secondary ultrasound markers increased the area under the curve to 0.92, which represents excellent discrimination. At a risk cutoff of 1\u2009:\u2009275, the detection rate for aneuploidy increased from 87% to 92% (<jats:italic>z<\/jats:italic> statistic\u2009=\u20091.78, <jats:italic>P<\/jats:italic>\u2009=\u20090.076), and the false positive rate decreased from 5.3% to 4.8%.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The addition of secondary ultrasound markers (NB, DV and TR) to combined first\u2010trimester screening showed a tendency toward improved accuracy of the screening. \u00a9 2012 John Wiley &amp; Sons, Ltd.<\/jats:p><\/jats:sec>","DOI":"10.1002\/pd.3873","type":"journal-article","created":{"date-parts":[[2012,5,9]],"date-time":"2012-05-09T09:26:06Z","timestamp":1336555566000},"page":"638-643","source":"Crossref","is-referenced-by-count":14,"title":["Improved diagnostic accuracy by using secondary ultrasound markers in the first\u2010trimester screening for trisomies 21, 18 and 13 and Turner 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