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A member asked:
Do u/s still add 2 weeks on if your not going by lmp in early trimester??
A doctor has provided 1 answer
No: Ultrasound dates based on the size of the fetus. It is the same measurement you would get if you were absolutely sure of LMP. It is the most accurate dating of pregnancy if done in first trimester.
Answered 8/9/2014
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