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Biparietal Diameter (BPD)


Updated July 22, 2008


Biparietal diameter (BPD) is the diameter across the developing baby's skull, from one parietal bone to the other. The measurement is useful in dating the pregnancy and estimating fetal weight after about 13 weeks of pregnancy.

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  5. Biparietal Diameter - BPD - Definition of Biparietal Diameter in Pregnancy Ultrasound

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