{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T00:33:30Z","timestamp":1790642010369,"version":"4.1.0"},"reference-count":19,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2004,5,26]],"date-time":"2004-05-26T00:00:00Z","timestamp":1085529600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["obgyn.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Ultrasound in Obstet &amp;amp; Gyne"],"published-print":{"date-parts":[[2004,7]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objectives<\/jats:title><jats:p>To investigate if there is an association between perinatal\/neonatal death and a discrepancy between gestational age by ultrasound fetometry in early pregnancy (GA<jats:sub><jats:italic>U<\/jats:italic><\/jats:sub>) and gestational age by last menstrual period (GA<jats:sub><jats:italic>LMP<\/jats:italic><\/jats:sub>), and to investigate possible causes for such an association.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The Swedish Medical Birth Registry was used to identify singleton pregnancies with information available on GA<jats:sub><jats:italic>LMP<\/jats:italic><\/jats:sub> and GA<jats:sub><jats:italic>U<\/jats:italic><\/jats:sub> that were delivered in Sweden between 1990 and 2000. A total of 718 011 pregnancies was included and information on the pregnancy and delivery was obtained from the National Board of Health.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Infants with a GA<jats:sub><jats:italic>U<\/jats:italic><\/jats:sub> at least 7 days less than the GA<jats:sub><jats:italic>LMP<\/jats:italic><\/jats:sub> were at increased risk for stillbirth (odds ratio (OR), 1.45; 95% CI, 1.32\u20131.58), neonatal death within 1 month (OR, 1.87; 95% CI, 1.67\u20132.09), Apgar score &lt; 7 at 5 min (OR, 1.18; 95% CI, 1.11\u20131.24), birth weight &lt; 2500 g (OR, 1.48; 95% CI, 1.43\u20131.52), and preterm birth &lt; 37 weeks (OR, 1.45; 95% CI, 1.42\u20131.49). The association between a postponed expected date of delivery and perinatal\/neonatal death increased with gestational length and was especially pronounced among infants who were born after at least 40 completed weeks of pregnancy (GA<jats:sub><jats:italic>U<\/jats:italic><\/jats:sub>).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>A discrepancy between GA<jats:sub><jats:italic>U<\/jats:italic><\/jats:sub> and GA<jats:sub><jats:italic>LMP<\/jats:italic><\/jats:sub> may indicate early disturbances in fetal\/placental development. Furthermore, it can be speculated that, as the risk significantly increased with gestational duration, at least a part of the increased risk for poor pregnancy outcome in adjusted pregnancies was due to consequences of true post\u2010term pregnancies not being recognized as such. Copyright \u00a9 2004 ISUOG. 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