A member asked:

What does it mean when an ultrasound at 20 weeks is accurate within 2wks?

A doctor has provided 1 answer

18 to 22 weeks: It means it could be off by 2 weeks. It could be 18 weeks or it could be 22 weeks or anywhere in between. It is just a comment on the accuracy of the ultrasound. The ultrasound is usually quite accurate, but it does have a range and the accurate within 2 weeks is just commenting on that. If you combine that with your last period you should be quite accurate.

Answered 10/24/2017

5.1k views

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