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A member asked:
What changes a due date by 4 days? original due date was based on lmp only and then changed to 4 days earlier after 12wk ultrasound. u/s this precise?
A doctor has provided 1 answer
Same date : A four day difference is mathematically speaking no difference. You are within the margin of error of a sono machine. A due date simply marks the gestational age if 40 weeks. In this case either date is appropriate. You and your doctor can choose which to go by. Ask your doctor why he or she chose one over the other.
Answered 10/15/2013
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