{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,1]],"date-time":"2026-06-01T22:04:10Z","timestamp":1780351450789,"version":"3.54.1"},"reference-count":21,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2013,1,27]],"date-time":"2013-01-27T00:00:00Z","timestamp":1359244800000},"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":[[2013,3]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:sec><jats:title>Objective<\/jats:title><jats:p>This study aimed to assess the efficacy of first\u2010trimester aneuploidy screening in a single clinical setting.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Maternal age, nuchal translucency, and maternal serum levels of pregnancy\u2010associated plasma protein A and free beta human chorionic gonadotrophin comprised first\u2010trimester risk assessment for Down syndrome and trisomies 13\/18. Means, screen positive rates, detection rates, and predictive values were calculated for Down syndrome and trisomies 13\/18.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Of the 23\u2009329 first\u2010trimester screenings, 6.3% were screen positive: 5.7% for Down syndrome only, 0.4% for trisomies 13\/18 only, and 0.3% for Down syndrome and trisomies 13\/18. An abnormal karyotype was present in 3.9% of screen positives for Down syndrome, 13.8% of screen positives for trisomies 13\/18, and 45.9% of screen positives for both Down syndrome and trisomies 13\/18. Of the 97 pregnancies found to have an abnormal karyotype, 29.9% had chromosome abnormalities other than trisomy 13, 18, or 21, with expected clinical outcomes ranging from likely benign to uniformly lethal.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>As expected, first\u2010trimester screening is effective for detecting aneuploidy for chromosomes 13, 18, and 21; however, a significant number of chromosomally abnormal pregnancies initially identified by first\u2010trimester screening have a different karyotype. With the possible exception of 47,XYY and 45,X, the dataset suggested that these different chromosome complements were likely to be randomly distributed. Nevertheless, prior to diagnostic testing, prospective parents should be counseled concerning the possibility of a chromosome abnormality other than the trisomies 13, 18, or 21. \u00a9 2013 John Wiley &amp; Sons, Ltd.<\/jats:p><\/jats:sec>","DOI":"10.1002\/pd.4054","type":"journal-article","created":{"date-parts":[[2013,1,28]],"date-time":"2013-01-28T03:53:31Z","timestamp":1359345211000},"page":"251-256","source":"Crossref","is-referenced-by-count":53,"title":["Nearly a third of abnormalities found after first\u2010trimester screening are different than expected:10\u2010year experience from a single center"],"prefix":"10.1002","volume":"33","author":[{"given":"Christina M. L.","family":"Alamillo","sequence":"first","affiliation":[{"name":"Northwestern Reproductive Genetics, Inc. Chicago IL USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David","family":"Krantz","sequence":"additional","affiliation":[{"name":"Perkin Elmer, NTD Laboratories Melville NY USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark","family":"Evans","sequence":"additional","affiliation":[{"name":"Comprehensive Genetics, Inc. New York NY USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Morris","family":"Fiddler","sequence":"additional","affiliation":[{"name":"Northwestern Reproductive Genetics, Inc. Chicago IL USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eugene","family":"Pergament","sequence":"additional","affiliation":[{"name":"Northwestern Reproductive Genetics, Inc. 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