Abnormal fetal abdominal circumference 2025-11-19T08:14:15Z Any deviation from the normal range of the fetal abdominal circumference, which is typically measured sonographically in a transverse view using the outer borders of the skin line at the plane where the fetal stomach, umbilical vein and portal sinus is visible. Abnormal fetal abdominal circumference is defined as less than the 10th or greater than the 90th percentile for gestational age. Abnormal fetal gastrointestinal system morphology