In a prospective study published in the March 2013 issue of Ultrasound in
Obstetrics & Gynecology, Dr. Lee and colleagues determined that the precision
of a fetal weight estimation model using fractional limb volume (in this case the
thigh), abdominal circumference and biparietal diameter was superior to that of
the commonly used Hadlock method (based on biparietal diameter, abdominal
circumference and femur length).