A member asked:

What is the most time an early ultrasound can be off on a due date? i.e. 2 wks, 3 wks?

A doctor has provided 1 answer
Dr. Joseph Accurso answered

Specializes in Radiology

7-13 weeks: The most accurate measurement for dating is the crown-rump length at between 7 and 13 weeks gestation.

Answered 12/10/2013

5.1k views

Thank

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