Hi Ravenmyst

Below is an extract from the Australasian Society for Ultrasound in Medicine

Statement On Normal Ultrasonic Fetal Measurements
June 1991, Reaffirmed May 1996, Revised May 2001

No formula for estimating fetal weight has achieved an accuracy which enables us to recommend its use. It should be noted that errors are reported for one standard deviation only and that even at this level the accuracy is disappointing. BMUS suggest that there may be an improvement in accuracy of about 5% in using two rather than one parameter.



It is commonly known that an estimated weight using ultrasound is usually very inaccurate