Beginning at 13 to 14 weeks gestation the biparietal diameter (BPD), the head circumference (HC), the abdominal circumference (AC), and femur length (FL) should be measured. 2. What measurements are taken during a fetal biometry scan? During a fetal biometry scan, the technician typically measures the biparietal diameter (BPD), head circumference (HC), abdominal circumference (AC), and femur length (FL) to evaluate the baby’s growth and development. 3. Why is fetal biometry important? Typically, this data is collected around 13 weeks gestation or later, save for an exception or two. BPD, HC, FL and AC are considered standard fetal biometric measurements. What is BPD on an ultrasound? BPD or Biparietal Diameter, is a key m easurement that is taken during routine pregnancy ultrasounds. A comprehensive guide to understanding BPD, HC, AC, and FL at 23 weeks. Hopefully, this has cleared up any confusion and helped you feel more knowledgeable about your baby's development.
