Significant deviations in sonographic fetal weight estimation: causes and implications
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MATERNAL-FETAL MEDICINE
Significant deviations in sonographic fetal weight estimation: causes and implications Eyal Krispin1,2 · Elchanan Dreyfuss1,2 · Ofer Fischer1,2 · Arnon Wiznitzer1,2 · Eran Hadar1,2 · Ron Bardin1,2 Received: 12 May 2020 / Accepted: 28 July 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose To allocate parameters associated with significant deviations in sonographic estimated fetal weight (EFW) and evaluate labor outcomes in such circumstances. Methods Retrospective case–control study of women with a singleton gestation who underwent sonographic EFW within a week prior to delivery in a single tertiary university-affiliated medical center (2012–2018). The study group was comprised of 177 pregnancies in which sonographic EFW was at least ± 20% of actual birth weight, matched to 354 pregnancies with an accuracy of ± 1% of sonographic EFW to actual birth weight. Matching was based on age, gravidity, parity, and gestational age at delivery. Placental location, fetal presentation, spine position and amniotic fluid volumes during the ultrasound evaluation, as well as pregnancy outcomes, were compared between groups. Results Median gestational age at delivery (37.0 vs. 38.0 weeks, p
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