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Related Experiment Video

Updated: Jun 23, 2026

A Novel Use of Three-dimensional High-frequency Ultrasonography for Early Pregnancy Characterization in the Mouse
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Sonographic fetal weight estimation: which model should be used?

Nir Melamed1, Yariv Yogev, Israel Meizner

  • 1Department of Obstetrics and Gynecology, Helen Schneider Hospital for Women, Rabin Medical Center, Petah Tikva, Israel. nirm@clalit.org.il

Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine
|April 25, 2009
PubMed
Summary

For accurate fetal weight estimation, use sonographic models with 3 or 4 biometric indices. Accuracy decreases at birth weight extremes, with overestimation for low weights and underestimation for high weights.

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Area of Science:

  • Medical Imaging
  • Obstetrics
  • Fetal Medicine

Background:

  • Accurate fetal weight estimation is crucial for optimal pregnancy management.
  • Sonographic models are widely used but vary in accuracy.

Purpose of the Study:

  • To compare the accuracy of different sonographic models for fetal weight estimation.
  • To identify the most reliable models for clinical use.

Main Methods:

  • Evaluated 26 sonographic fetal weight estimation models.
  • Analyzed 3705 estimations performed within 3 days of delivery.
  • Grouped models by biometric indices and used cluster analysis.

Main Results:

  • Significant variation in model accuracy was observed.
  • Models using 3-4 biometric indices were more accurate than those with 1-2.
  • Accuracy decreased at birth weight extremes (overestimation <1000g, underestimation >4000g).
  • Model precision was lowest in low birth weight groups.

Conclusions:

  • Sonographic models incorporating 3-4 fetal biometric indices are recommended for improved accuracy.
  • Understanding model-specific biases (over/underestimation) is vital for interpreting results, especially at birth weight extremes.