Canada
A 33-year-old female asked:
If ultrasounds have margin of error, how do u know when you're within the range of when the nt scan should be done?does fetus have to be certain size?
1 doctor answer • 2 doctors weighed in
Dr. Jane Van Disanswered
Obstetrics and Gynecology 20 years experience
Best estimate : The margin of error for ultrasound dating is the smallest in the first trimester, which is when the nuchal translucency scans are performed. Yes the fetus does have to be a certain size and between certain dates in order for the information to be accurate.
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4.6k viewsReviewed >2 years ago
Last updated Jan 6, 2015
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