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Related Experiment Video

Updated: May 16, 2026

Murine Fetal Echocardiography

Murine Fetal Echocardiography

Published on: February 15, 2013

Sonographic weight estimation in fetuses with breech presentation.

U Dammer¹, T W Goecke, F Voigt

¹Department of Obstetrics and Gynecology, Erlangen University Hospital, Universitätsstrasse 21-23, 91054, Erlangen, Germany. ulf.dammer@uk-erlangen.de

Archives of Gynecology and Obstetrics

|December 11, 2012

Summary

Fetal weight estimation accuracy is similar for breech and vertex presentations. Standard sonographic formulas are suitable for estimating fetal weight in breech presentations, offering reliable results comparable to vertex presentations.

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Area of Science:

Maternal-Fetal Medicine
Diagnostic Ultrasound
Obstetrics

Background:

Accurate fetal weight estimation (WE) is crucial for optimal obstetric management.
Breech presentation can pose challenges for accurate fetal WE.
Comparison of WE accuracy between breech and vertex presentations is needed.

Purpose of the Study:

To assess and compare the accuracy of various sonographic weight estimation (WE) formulas in fetuses with breech presentation versus those in vertex presentation.

Main Methods:

Retrospective cohort study of 244 fetuses in breech presentation and 244 in vertex presentation.
Evaluation of eight sonographic WE models using biometric parameters obtained within 7 days of delivery.
Accuracy assessed via mean percentage error (MPE), standard deviation of MPEs, median absolute percentage error (MAPE), and percentage within 10% of actual birth weight.

Main Results:

No significant differences in random error (SD of MPEs) or MAPE between breech and vertex groups across formulas.
The Hadlock (AC, FL) formula showed significantly more negative MPE in the breech group, indicating systematic error.
Formulas using three or four biometric indices generally demonstrated higher accuracy in both groups.

Conclusions:

Fetal weight estimation accuracy in breech presentation is comparable to that in vertex presentation.
Established sonographic formulas are appropriate for fetal weight estimation in breech malpresentations.