The biparietal diameter (BPD) is a measurement commonly used during ultrasound examinations to estimate the age of the fetus. The BPD is the distance between the two parietal bones of the fetal skull and is typically measured in millimeters. Here is a general guide to the size of BPD and age estimation in USG from 12th week to the end of the pregnancy: 12 weeks: The average BPD is around 16mm, and the estimated age of the fetus is around 12 weeks. 13 weeks: The average BPD is around 21mm, and the estimated age of the fetus is around 13 weeks. 14 weeks: The average BPD is around 27mm, and the estimated age of the fetus is around 14 weeks. 15 weeks: The average BPD is around 33mm, and the estimated age of the fetus is around 15 weeks. 16 weeks: The average BPD is around 39mm, and the estimated age of the fetus is around 16 weeks. 20 weeks: The average BPD is around 58mm, and the estimated age of the fetus is around 20 weeks. 24 weeks: The average BPD is around 68mm, and ...
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