Biparietal diameter is a very important index in the results of fetal ultrasound. Through the biparietal diameter index, doctors can determine the development of the baby and help predict the baby's weight and size at birth.

In case the biparietal diameter has a larger head than normal if delivered vaginally, it can be dangerous for both mother and baby during childbirth. However, to measure more accurately, doctors will combine measuring biparietal diameter index with other fetal indicators such as: Abdominal circumference, femur length,...