The estimation of fetal weight by computer-assisted analysis

Area of Science:

• Obstetrics and Gynecology
• Medical Imaging
• Biostatistics

Background:

• Accurate estimation of fetal weight in utero is essential for optimal pregnancy management.
• Traditional methods like abdominal palpation and hormone assays have demonstrated limited accuracy.
• Ultrasound offers a non-invasive approach for fetal biometry.

Purpose of the Study:

• To develop and validate an accurate ultrasound-based method for estimating fetal weight.
• To identify the fetal biometric parameters with the strongest correlation to birth weight.

Main Methods:

• Eighty-five pregnant patients (17-41 weeks gestation) underwent ultrasound scans within 48 hours of delivery.
• Statistical analysis, including multiple linear regression, was performed using BMD statistical packages.
• Fetal body parameters were correlated with actual birth weights.

Main Results:

• Birth weight demonstrated a logarithmic relationship with fetal body parameters.
• Abdominal circumference showed the highest single correlation with the logarithm of birth weight.
• A regression model using abdominal circumference and biparietal diameter achieved a standard deviation of 106 grams/kilogram.

Conclusions:

• Ultrasound biometry, specifically abdominal circumference, provides a reliable method for estimating fetal weight.
• Computer-generated tables derived from these measurements offer direct and accurate fetal weight estimations.
• The developed method proved accurate in prospective evaluations of both normal and complicated pregnancies.