A 24-year-old female asked:

Are ultrasounds done at 13 weeks pregnant accurate? what is the margin error of dating scans performed at this stage of the pregnancy?

1 doctor answer • 2 doctors weighed in

Dr. Liza Kunzanswered

Maternal-Fetal Medicine 23 years experience

Yes, fairly accurate: The margin of error on a dating scan at 13 weeks is approximately 7 days.

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Dr. Nikolaos Zacharias

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Last updated Apr 5, 2013

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