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A member asked:
How accurate is an ultrasound due date estimate?
A doctor has provided 1 answer
Best on earlier u/s: Ultrasounds use composite data obtained during the exam to determine an EDD (estimated date of delivery). This date will also have a +/- number of days giving an accuracy range. First trimester ultrasounds are accurate to within about a week, second trimesters estimates are accurate within about 2 weeks, and third trimester scans about 3 weeks.
Answered 5/28/2015
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Related Questions
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How accurate is my due date when both my 8 week ultrasound and my 12 week ultrasound have the same date ?
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If i had an 8 week ultrasound and a 12 week ultrasound and they both had the same due date how accurate is this ?
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I had ultrasounds at 8 and 12 weeks and i got the same due date at both how accurate is the due date?
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