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A member asked:
I have received 3 different dates for baby on ultrasound. is it possible for different techs to get different dates off about 4 days from each other?
A doctor has provided 1 answer
There is an inherent: margin of error for ultrasound dating. It is about 8% throughout the pregnancy. Therefore the later in the pregnancy, the wider the margin of error in days. At 8 weeks, it is about +/- 5 days. At 28 weeks, it widens to +/- 15.7 days. So it is possible to have dates that are 4 days off from one another, especially the further along you are.
Answered 12/20/2014
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