{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,4,11]],"date-time":"2025-04-11T04:18:18Z","timestamp":1744345098163,"version":"3.40.4"},"reference-count":27,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2024,1,19]],"date-time":"2024-01-19T00:00:00Z","timestamp":1705622400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":["obgyn.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Acta Obstet Gynecol Scand"],"published-print":{"date-parts":[[2024,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Introduction<\/jats:title><jats:p>The inaccuracy of late pregnancy dating is often discussed, and the impact on diagnosis of fetal growth restriction is a concern. However, the magnitude and direction of this effect has not previously been demonstrated. In this study, we aimed to investigate the effect of late pregnancy dating by head circumference on the detection of late onset growth restriction, compared to first trimester crown\u2010rump length dating.<\/jats:p><\/jats:sec><jats:sec><jats:title>Material and methods<\/jats:title><jats:p>This was a cohort study of 14\u2009013 pregnancies receiving obstetric care at a tertiary center over a three\u2010year period. Universal scans were performed at 12\u2009weeks, including crown\u2010rump length; at 20\u2009weeks including fetal biometry; and at 36\u2009weeks, where biometry, umbilical artery doppler and cerebroplacental ratio were used to determine the incidence of fetal growth restriction according to the Delphi consensus. For the entire cohort, the gestational age was first calculated using T1 dating; and was then recalculated using head circumference at 20\u2009weeks (T2 dating); and at 36\u2009weeks (T3 dating). The incidence of fetal growth restriction following T2 and T3 dating was compared to T1 dating using four\u2010by\u2010four sensitivity tables.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>When the cohort was redated from T1 to T2, the median gestation at delivery changed from 40\u2009+\u20090 to 40\u2009+\u20092\u2009weeks (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001). When the cohort was redated from T1 to T3, the median gestation at delivery changed from 40\u2009+\u20090 to 40\u2009+\u20093\u2009weeks (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001). T2 dating resulted in fetal growth restriction sensitivity of 80.2% with positive predictive value of 78.8% compared to T1 dating. T3 dating resulted in sensitivity of 8.6% and positive predictive value of 27.7%, respectively. The sensitivity of abnormal CPR remained high despite T2 and T3 redating; 98.0% and 89.4%, respectively.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Although dating at 11\u201314\u2009weeks is recommended, late pregnancy dating is sometimes inevitable, and this can prolong the estimated due date by an average of two to three\u2009days. One in five pregnancies which would be classified as growth restricted if the pregnancy was dated in the first trimester, will be reclassified as nongrowth restricted following dating at 20\u2009weeks, whereas nine out of 10 pregnancies will be reclassified as non\u2010growth restricted with 36\u2010week dating.<\/jats:p><\/jats:sec>","DOI":"10.1111\/aogs.14769","type":"journal-article","created":{"date-parts":[[2024,1,19]],"date-time":"2024-01-19T12:38:37Z","timestamp":1705667917000},"page":"938-945","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["The impact of late pregnancy dating on the detection of fetal growth restriction at term"],"prefix":"10.1111","volume":"103","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1609-3654","authenticated-orcid":false,"given":"Sam","family":"Mathewlynn","sequence":"first","affiliation":[{"name":"Oxford University Hospitals NHS Foundation Trust, John Radcliffe Hospital  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