Charts of fetal size: 3. Abdominal measurements

Abstract

We have constructed new size charts for the fetal abdominal circumference, both measured directly and derived from abdominal diameters. We have demonstrated the difference between the size charts constructed from these two sets of values and hence the importance of using the appropriately derived chart when assessing the abdominal circumference. The differences between the new charts and previous ones may be largely due to methodological differences.