One study showed that a fetal abdominal circumference of more than 35 centimeters predicted macrosomia in 93 percent of cases.
Macrosomia Prediction Using Ultrasound Fetal Abdominal Circumference of 35 Centimeters or More, 93 Obstetrics & Gynecology 523, 524 tbl.
Most experts accept fetal abdominal circumference
as the most reliable measurement of fetal size.
A fetal abdominal circumference measuring at least 38 cm is associated with a 37% chance of having a baby who will weigh at least 4,500 g, said Dr.
Though exact fetal weight cannot be determined by clinical or ultrasound means, fetal abdominal circumference is a useful advance warning of the possibility of macrosomia, the investigators re ported (J.
SAN FRANCISCO -- Ultrasound measurement of just the fetal abdominal circumference provides a reasonable estimate of the risk for intrauterine growth retardation among term babies when other measures are unavailable, Dr.
A fetal abdominal circumference of less than 31 cm at 36-40 weeks' gestation predicted a birth weight below the 10th percentile--the traditional cut-off for determining IUGR--with a sensitivity of 81% and a specificity of 82%.