Accuracy of Sonographic Estimated Fetal Weight in Suspected Macrosomia: The Likelihood of Overestimating and Underestimating the True Birthweight

By on July 9, 2019

Prior to delivery, the fetal weight is often estimated either by feeling the maternal abdomen or by ultrasound.  There are many studies describing the accuracy of these methods.  In this study, we took a unique look at this issue and calculated the likelihood an ultrasound showing a large fetal weight was over- or under-estimating the true weight.    As the estimated weight got larger, the chance ultrasound over-estimates also increases.  This can be useful clinically when receiving an ultrasound report of a large fetal weight.

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