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A member asked:
Can a transabdominal ultrasound at 13 weeks be wrong by 2 weeks?
A doctor has provided 1 answer
Not likely: Ultrasound dating is quite accurate in the earlier part of pregnancy. While it may be off by 2-3 days it would be highly unlikely to be "wrong" by 2 weeks. Keep in mind that the ultrasound age indicates the number of weeks since the first day of the last menstrual period, not the date of conception. This may explain a two week difference if you arethinking about date of conception.
Answered 1/29/2013
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