A member asked:

Is a six week sonogram accurate to plus or minus four days or plus or minus fourteen days?

4 doctors weighed in across 3 answers

4 days: Ultrasounds very early like this are quite accurate. The date determined by this early us is usually right on.

Answered 7/22/2013

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6 week sonogram: A 6 week ultrasound should be very accurate, so answering your question, 4 days and not 14 days.

Answered 5/1/2015

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Dr. Joseph Accurso answered

Specializes in Radiology

Ultrasound +/- 8%: Properly performed and interpreted ultrasound examinations have a variability of 8% plus or minus the measured dating. Ultrasound dating at 6 weeks 0 days should have a 95% confidence range of 5 weeks 4 days to 6 weeks 3 days which is +/- 8%.

Answered 8/30/2015

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