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Updated: Aug 14, 2026
Murine Fetal Echocardiography
Published on: February 15, 2013
Ultrasonography for fetal weight estimation: the Birnholz equation
D B Acker1, B P Sachs, B J Ransil
1Department of Obstetrics and Gynecology, Beth Israel Hospital, Boston, MA 02215.
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.
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