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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. Today, we're going to break down the normal ranges for four key measurements: BPD (Biparietal Diameter), HC (Head Circumference), AC (Abdominal Circumference), and FL (Femur Length). BPD in mm: Gestational Age = weeks HC in mm : Gestational Age = weeks AC in mm : Gestational Age = weeks FL in mm : Gestational Age = weeks 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.
