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A member asked:
If a baby is measuring 4 days bigger on an ultrasound but the doctor didn't change the due date what does that mean?
2 doctors weighed in across 2 answers
Normal: It depends when you had the ultrasound because with all ultrasounds there is a range, like a 3rd trimester us can be off a couple of weeks either way.
Answered 8/12/2015
4.2k views
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No need: The measurement error of 1st trimester us is within +/- 4-5 days, so being 4 days different from the calculated date doesn't really mean anything. The calculated date or the us date could be the due date.
Answered 8/12/2015
4.2k views
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