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Utilizing data from 1968 to 2005 from the Metropolitan Atlanta Congenital Defects Program, we analyzed trends in the frequency and timing (prenatal or postnatal) of cytogenetic testing and the prevalence of recognized chromosome abnormalities among pregnancies and children with birth defects (n\u2009=\u200951,424). Cytogenetic testing of pregnancies and children with birth defects increased from 7.2% in 1968 to 25.0% in 2005, as did the identification of chromosomal abnormalities (2.2% in 1968 to 6.8% in 2005). The use of prenatal cytogenetic testing decreased from 1996 to 2005 among women aged \u226535 years. Identification of chromosomal abnormalities in pregnancies and children with birth defects increased from 1968 to 2005, possibly due to increased testing, improved diagnostic techniques, or increasing maternal age. The decline in prenatal cytogenetic testing observed among mothers aged \u226535 years may be related to the availability of improved prenatal screening techniques, resulting in a reduction in the utilization of invasive diagnostic tests. Published 2011. This article is a U.S. Government work and is in the public domain in the USA.<\/jats:p>","DOI":"10.1002\/ajmg.a.34385","type":"journal-article","created":{"date-parts":[[2011,12,3]],"date-time":"2011-12-03T19:17:34Z","timestamp":1322939854000},"page":"116-123","source":"Crossref","is-referenced-by-count":3,"title":["Trends in cytogenetic testing and identification of chromosomal abnormalities among pregnancies and children with birth defects, metropolitan Atlanta, 1968\u20132005"],"prefix":"10.1002","volume":"158A","author":[{"given":"Jodi M.","family":"Jackson","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Krista S.","family":"Crider","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sonja A.","family":"Rasmussen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Janet D.","family":"Cragan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Richard S.","family":"Olney","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2011,12,2]]},"reference":[{"key":"e_1_2_5_2_1","unstructured":"American College of Obstetricians and Gynecologists.1976.Antenatal diagnosis of genetic disorders. 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