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A 24-year-old female asked:

I'm 18 weeks pregnant and i just had an ultrasound with a biparital diameter of 19 weeks and femur lenght of 18 w is that normal or the head is large?

1 doctor answer1 doctor weighed in
Dr. Andrew Doe
Radiology - Interventional 20 years experience
Within normal: The age is an estimate based on multiple studies. You cannot look at each individually. Also, the older the fetus, the less accurate the dating.

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Last updated Dec 31, 2012

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