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A member asked:
If my lmp according to my first us at 9 weeks was a day off from what i told the doctor is there still a 5 day error margin?
A doctor has provided 1 answer
Yes: First trimester ultrasounds are accurate to within 4-5 days. The farther along, the less accurate. At you 20 weeks US, the accuracy is within 1-2 weeks.
Answered 6/9/2014
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