An Evaluation of Two Methods of Antenatal Ultrasonic Fetal Weight Estimation

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Abstract
The accuracy of 2 methods of antenatal ultrasonic human fetal weight estimation was compared. The Warsof method computes the estimated fetal weight from measurements of the abdominal circumference and the biparietal diameter, while the Higginbottom method utilizes the circumference of the abdomen alone. The estimated weights obtained by the 2 methods were compared to the actual weights at birth occurring within 48 h of the estimation. Using the tables of Warsof, 77% of the actual birth weights were within 10% of the estimated weight [r = 0.95]. Of babies < 2500 g, 82% fell within 10% of the estimated weight (Warsof; r = 0.96). Using the Higginbottom formula, 56% of the total birth weights fell within 10% of the estimated weight [r = 0.89]. Of babies weighing < 2500 g, 45% were within the 10% range [r = 0.91]. Antenatal fetal weight estimation using the computed tables of Warsof is superior in the population to the Higginbottom method. Such antenatal fetal weight estimation is of potential value in many high risk pregnancies.

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