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A member asked:
I've had several ultrasounds all dating me within a few days of each other now at 7w gestation. how accurate is this when dating conception time?
2 doctors weighed in across 2 answers
+ or - 2 weeks: Ultrasounds can vary by plus o minus 2 weeks for accuracy.
Answered 7/28/2015
2.5k views
Thank
The margin of: error for ultrasound is roughly +/- 8%(in days) throughout the pregnancy. So at 7 weeks, or 49 days, it would be about +/- 4 days.
Answered 7/31/2015
2.5k views
Thank
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