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A 29-year-old female asked:

If my 14 week ultrasound is on may 16th 2011 when are the dates that i concieved? how accurate is an ultrasound and what dates did i concieve

1 doctor answer1 doctor weighed in
Dr. Anthony Filly
Radiology 27 years experience
Depends: The ultrasound is very accurate in first trimester. If you are actually going to be 14 weeks by ultrasound dating on may 16th, then you would subtract 12 weeks from that day to find your approximate conception date.
Last updated Mar 3, 2013

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