A 21-year-old female asked:
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how acurate is an ultrasound done at 14w3d. how many days/weeks can the ultrasound before off by when determining gestation.

1 doctor answer
Dr. Marsha Davis
27 years experience Internal Medicine
They : Are fairly accurate, most accurate dating at 6weeks.
Answered on Jul 27, 2014

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Margin of error: There is a margin or error on ultrasound dating: http://www.Medscape.Com/viewarticle/703501_3.
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Probably: If these dates are consistent with your last period then it is just a little early to see a fetal pole and heart rate. In another week or two you shou ... Read More

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