Term prediction with ultrasound: evaluation of a new dating curve for biparietal diameter measurements

Acta Obstetricia Et Gynecologica Scandinavica
Bjørn Backe, Jakob Nakling

Abstract

In Norway, routine ultrasound examination with assessment of gestational age was included in the standard antenatal care program in 1985. Until presently, a dating chart introduced in 1983 has been used throughout the country. New national normal values are now developed. The aim of the study was to compare the performance of the two sets of normal values; both are based on measurement of fetal biparietal diameter in the second trimester. We analyzed a cohort of 11,238 singleton deliveries with spontaneous onset of labor. All had reliable last menstrual period and all had a routine ultrasound examination in the second trimester with measurement of fetal biparietal diameter. We calculated the expected day of delivery both according to the old (method A) and the new (method B) reference values. The prediction error (the difference between observed and expected day of delivery) for the last menstrual period method was -0.1 days, for method A -3.5 days, and for method B -0.7 days. The prediction error for method A increased up to 7 days when ultrasound measurements were obtained in gestational week 14-15. The old ultrasound method leads to a systematic underestimation of fetal age, and the prediction error increases notably when th...Continue Reading

Citations

Sep 8, 2011·Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology·I ØklandS H Eik-Nes
Nov 28, 2013·Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine·Freddy BriceñoRodrigo Cifuentes

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