New charts for ultrasound dating of pregnancy and assessment of fetal growth: longitudinal data from a population-based cohort study

Bero Verburg, Eric Steegers, Maria de Ridder, RJM Snijders, E Smith, Bert Hofman, Henriette Moll, Vincent Jaddoe, JCM Witteman

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324 Citations (Scopus)

Abstract

Objectives Correct assessment of gestational age and fetal growth is essential for optimal obstetric management. The objectives of this study were, first, to develop charts for ultrasound dating of pregnancy based on crown-rump length and biparietal diameter and, second, to derive reference curves for normal fetal growth based on biparietal diameter, head circumference, transverse cerebellar diameter, abdominal circumference and femur length from 10 weeks of gestational age onwards. Methods A total of 8313 pregnant women were included for analysis in this population-based prospective cohort study. All women had repeated ultrasound assessments to examine fetal growth. Results Charts for ultrasound dating of pregnancy, based on crown-rump length and biparietal diameter, were derived. Internal validation with the actual date of delivery showed that ultrasound imaging provided reliable gestational age estimates. Up to 92% of deliveries took place within 37-42 weeks of gestation if gestational age was derived from ultrasound data, compared with 87% based on a reliable last menstrual period. The earlier the ultrasound assessment the more accurate the prediction of date of delivery. After 24 weeks of gestation a reliable last menstrual period provided better estimates of gestational age. Reference curves for normal fetal growth from 10 weeks of gestational age onwards were derived. Conclusions Charts for ultrasound dating of pregnancy and reference curves for fetal biometry are presented. The results indicate that, up to 24 weeks of pregnancy, dating by ultrasound examination provides a better prediction of the date of delivery than does last menstrual period. The earlier the ultrasound assessment in pregnancy, preferably between 10 and 12 weeks, the better the estimate of gestational age. Copyright 2008 ISUOG. Published by John Wiley & Sons, Ltd.
Original languageUndefined/Unknown
Pages (from-to)388-396
Number of pages9
JournalUltrasound in Obstetrics & Gynecology
Volume31
Issue number4
DOIs
Publication statusPublished - 2008

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