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A 25-year-old female asked:

How accurate are ultrasounds for dating pregnancy what's the margin of error. if my due date is oct 31, what are the dates i could have gotten pregnant?

1 doctor answer • 1 doctor weighed in
Dr. Bruce J. Stringer
Dr. Bruce J. Stringeranswered
Radiology 49 years experience
What year?: It would seem that you would have to conceive on feb.. 8, 2014 to give birth on 10/31. If the question is of historical interest, i would need to know when the ultrasound was done. Otherwise, you might want to check the dates you provided.
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Last updated Jan 3, 2014

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Female health

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