Use of the femur length to estimate fetal weight in premature infants: preliminary results.

Current techniques for estimating fetal weight in utero use equations containing biparietal diameter and abdominal circumference measurements. When a biparietal diameter cannot be obtained or its technical quality is poor, this technique is hindered. In this study, the use of the fetal femur length and abdominal circumference in estimating fetal weight was investigated. A new formula for estimation of fetal weight with a random error of 13.0 per cent is described.