Ultrasonic fetal weight estimation in multiple and singleton pregnancy

Area of Science:

• Obstetrics and Gynecology
• Medical Imaging
• Perinatology

Background:

• Accurate fetal weight estimation is crucial for managing pregnancies.
• Existing fetal weight estimation methods may have population-specific variations.
• The Warsof et al. tables, derived from a North American population, were evaluated for use in Australia.

Purpose of the Study:

• To assess the appropriateness and validity of using the Warsof et al. fetal weight estimation tables in an Australian population.
• To compare estimated fetal weights with actual birth weights for both singleton and multiple gestations.
• To evaluate the accuracy across different fetal weight sub-groups.

Main Methods:

• Retrospective analysis of 35 multiple and 168 singleton pregnancies in Australia.
• Application of the Warsof et al. computerized tables for estimated fetal weight (EFW).
• Comparison of EFW with actual birth weights within 96 hours of estimation.

Main Results:

• High correlation coefficients were observed: 0.967 (total), 0.969 (singleton), and 0.933 (multiple pregnancies).
• 79.3% (total), 77.9% (singleton), and 85.7% (multiple) of EFWs were within 10% of actual birth weights.
• Favorable correlation coefficients were found across various fetal weight sub-groups, comparable to North American studies.

Conclusions:

• Ultrasonic fetal weight estimation using the Warsof et al. tables is appropriate and valid for the Australian population.
• The method demonstrates reliability for both singleton and multiple pregnancies.
• This supports the use of these North American-derived tables in Australian clinical practice for fetal weight assessment.