A member asked:

How accurate are crown to rump length measurements on an 8 and 12 week ultrasound ?

A doctor has provided 1 answer
Dr. Justin Buchanan answered

Specializes in Radiology

Good: Ultrasound crown-rump length measurements have an accuracy of +/- 4 days during the 1st trimester between weeks 6-13.

Answered 10/15/2016

4.2k views

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