A member asked:

Is conception more accurate based off lmp or 9 week ultrasound?

A doctor has provided 1 answer

Both is best: The most accurate dating is where the 1st trimester ultrasound is within a week of the LMP dating; that confirms the LMP dating. If the 9 week ultrasound gives dates greater than 1 week from what's predicted by the LMP then the LMP is not accurate and the ultrasound dating should be used.

Answered 2/13/2015

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