A 21-year-old female asked:
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how accurate are ultrasounds at 12 weeks. is it possible to be twelve weeks pregnant and bby measure at 14 weeks?

2 doctor answers
Dr. Joseph Magoun
25 years experience Family Medicine
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 on Aug 20, 2014
Dr. Gerard Honore
28 years experience Fertility Medicine
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 on Nov 8, 2016
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