Head circumference (HC) may be a more reliable measurement if there is variant head shape 4. BPD may also be influenced by factors such as abnormalities of head shape, breech presentation, or multiple gestations. The variability increases after this time. InterpretationīPD has been shown to be accurate in predicting gestational age from 14 to 20 weeks 2. The cerebellar hemispheres should not be in the plane of the image. The transducer must be perpendicular to the central axis of the head, and thus the hemispheres and calvaria should appear symmetric. The BPD should be measured on an axial plane that traverses the thalami, and cavum septum pellucidum. Every human has two parietal bonesone on the. Biparietal diameter is used to estimate fetal weight and gestational age. It is a measurement of the diameter of a developing babys skull, from one parietal bone to the other. In the second trimester this may be extrapolated to an estimate of gestational age and an estimated due date (EDD). Biparietal diameter (BPD) is one of many measurements that are taken during ultrasound procedures in pregnancy. Biparietal diameter (BPD) is one of the basic biometric parameters used to assess fetal size.īPD together with head circumference (HC), abdominal circumference (AC), and femur length (FL) are computed to produce an estimate of fetal weight.
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