Calculate Gestational Age

I was looking at the University of Pennsylvania-School of Medicine website, and discovered a helpful page where you can enter the head circumference, the femur length, the abdominal circumference, and/or the biparietal diameter of a fetus (obtained from an ultrasound) and it will calculate the gestational age of the fetus for you based on these measurements. The website mentions it uses the fetal growth equations published in Ultrasonography in Obstetrics and Gynecology by Peter W. Callen, Second Edition. Check it out here.

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