Ultrasonography for Fetal Weight Estimation: The Birnholz Equation

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Abstract
In the population of 563 normal live births, subject to the selection criteria of this study, the mean ultrasonographically-estimated fetal weight calculated using the Birnholz equation accurately predicts the mean true birth weight with less than 1 percent error. However, on a pairwise basis, the error was found to be systematic (rather than random) with a large standard error of the estimate (± 300 g). The equation consistently underestimated the mean birth weight between 1500–3750 g and consistently overestimated it thereafter.