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A member asked:
Ultrasound accuracy at 13 weeks an 3 days i was just wanting to know the number of days an ultrasound could be off at that point would it be off by 14 days? and also my lmp was 10/27/2011 due 08/02/2012 but the ultrasound said lmp 10/18/2011 due date 07/2
A doctor has provided 1 answer
Ultrasound : Ultrasound accuracy at this stage of pregnancy is very accurate. The dates from ultrasound are determined by the size and development of the fetus and are very accurate. The dates on ultrasound are usually much more accurate than going by the date of last menstrual period.
Answered 10/3/2016
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