The two main methods for predicting BW in
obstetric practice are clinical estimation and sonographic
fetal measurements(2-4). Direct comparisons of
clinical and sonographic estimates of BW have found
ultrasound techniques to be superior for preterm infants,
clinical assessment to be superior for infants
between 2,500 and 4,000 g and both techniques to have
similar accuracy (or inaccuracy) over 4,000 g(2,3).