Critical evaluation of various methods of estimating fetal weight by ultrasound
Hebbar, Shripad (2003) Critical evaluation of various methods of estimating fetal weight by ultrasound. Journal of Obstetrics and Gynaecology of India, 53 (2). pp. 131-133.
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Objective - This prospective study was conducted to know which sonographic method of estimation of fetal weight reliably predicts the birth weight. Method - One hundred patients were scanned thoroughly within 48 hours of delivery. Seven different models of ultrasonic weight estimation were analysed critically. Results - It was found that the method of Hadlock1, predicted the birth weight more accurately than others. The average deviation from the actual birth weight (226gms) and the percentile values of absolute error of difference were least with this method and it predicted maximum number of 85% cases within + 10% of actual birth weight. Significant differences were observed between the predicted and actual birth weight in all other methods (p<0.01). Conclusion - Hadlock’s1 method is superior predictor of birth weight compared to other six and is a method of choice to estimate the birth weight in term pregnancies where the measurements of fetal head is inaccurate either because of engagement or moulding, as it incorporates only FL and AC measurements which are not affected by these changes.
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