{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,12]],"date-time":"2026-09-12T21:59:39Z","timestamp":1789250379012,"version":"build-2803163510"},"reference-count":22,"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>Objectives<\/jats:title><jats:p>To compare three methods of cervical length measurements using ultrasound in the first trimester: single\u2010line, two\u2010line, and tracing.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Images appropriate for cervical length measurements were obtained using transvaginal ultrasound between 11\u2009+\u20090 and 13\u2009+\u20096\u2009weeks\u2019 gestation. The cervix was measured on stored images using three methods: a single straight line, two segments (two\u2010line method), and by tracing the distance along the cervical canal. Results were compared for intraoperator repeatability and interoperator variability. The degree of the cervical curvature was measured.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The mean cervical measurement using the single\u2010line measurement was 32.8 (SD 4.4) mm. The mean cervical length was essentially the same using the two\u2010line and tracing measurement: 34.4 (SD 4.7) mm and 34.5 (SD 4.7) mm, respectively. Both intra\u2010 and interoperator agreement was high. The degree of curvature of the cervical canal was variable, with a resultant variability in the difference between the single straight line measurement and the other two types of measurement.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Using stored images, each of the measurement techniques is highly reproducible. Both the two\u2010line and the tracing methods yield larger measurements than the single\u2010line technique. Therefore, it appears that in select cases the straight line measurement significantly underestimates the actual cervical length. \u00a9 2013 John Wiley &amp; Sons, Ltd.<\/jats:p><\/jats:sec>","DOI":"10.1002\/pd.4056","type":"journal-article","created":{"date-parts":[[2013,1,28]],"date-time":"2013-01-28T04:24:49Z","timestamp":1359347089000},"page":"262-268","source":"Crossref","is-referenced-by-count":33,"title":["Comparison of three methods of cervical measurement in the first trimester: single\u2010line, two\u2010line, and tracing"],"prefix":"10.1002","volume":"33","author":[{"given":"J. D.","family":"Retzke","sequence":"first","affiliation":[{"name":"Fetal Medicine Foundation USA  Dayton OH USA"},{"name":"Division of Maternal\u2010Fetal Medicine Wright State University  Dayton OH USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J. D.","family":"Sonek","sequence":"additional","affiliation":[{"name":"Fetal Medicine Foundation USA  Dayton OH USA"},{"name":"Division of Maternal\u2010Fetal Medicine Wright State University  Dayton OH USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.","family":"Lehmann","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynaecology University of Tuebingen  Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"B.","family":"Yazdi","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynaecology University of Tuebingen  Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K. 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