Use of femur length in estimation of fetal weight

Abstract Fetal weight was estimated sonographically within 3 days of delivery in 103, cases. A stepwise regression analysis was performed to evaluate fetal sex, biparietal diameter; head circumference, abdominal circumference, and femur length as factors in estimation of fetal weight. A new formula for. calculating fetal weight was derived. Fetal sex did not affect the results obtained. Incorporation of femur length improved the reliability of the weight estimate. Because of intrapopulation and interpopulation differences, institutions using obstetric ultrasound examination techniques should establish their own formulas for estimating fetal weight.