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A member asked:
Can a 5 week ultrasound b mistaken for 6-7 and an 11 week ultrasound b mistaken for 12-13 weeks? or is it rare for both to be off that much? accurate?
A doctor has provided 1 answer
Ultrasound +/- 8%: Properly performed and interpreted ultrasound examinations have a variability of 8% plus or minus the measured dating. Us is most accurate when measuring the crown rump length (crl) of the fetus, at between 8 and 13 weeks. Ultrasound dating at 11 weeks 0 days should have a 95% confidence range of 10 weeks 1 day to 11 weeks 6 days which is +/- 8%.
Answered 12/10/2013
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