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A member asked:
Is lmp more accurate than early ultrasound?
5 doctors weighed in across 2 answers
No: Early sonograms are more accurate than lmp.
Answered 7/27/2013
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No: Measuring the crown rump length of the embryo between 6 and 13 weeks by ultrasound is the most accurate dating, +/- 8%. However, LMP dating is quite accurate, especially in women with very regular periods who know when they had sex around the time of conception.
Answered 2/13/2015
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