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A member asked:
How accurate are ultrasounds at 12 weeks. is it possible to be twelve weeks pregnant and bby measure at 14 weeks?
2 doctors weighed in across 2 answers
Ultrasound: The earlier an ultrasound is performed in pregnancy, the more accurate is the dating. The due date likely won't be changed if mom is sure about her last period and the dates aren't more than 2 weeks different at that stage
Answered 8/20/2014
3.8k views
Very: A technically good scan by a proficient sonographer or physician will be accurate to less than 1 week in the first trimester. If a 12 week scan is technically good and is interpreted correctly, it should not be possible to be off by that much; meaning the ultrasound dates are likely correct.
Answered 11/8/2016
3.8k views
Related Questions
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If my due date is nov 30 2014 when did I get pregnant ; are ultrasounds accurate ?
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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?
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Can the first 2 ultrasounds of pregnancy taken a month apart with the same accuracy of gestational age in the second trimester be off by +- 25 days ?
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