A 21-year-old female asked:

Can ultrasounds be off when it comes to determining fetus age in the end of 1st trimester?

1 doctor answer • 3 doctors weighed in

Dr. Phillip Goebelanswered

Emergency Medicine 18 years experience

Accurate: Ultrasounds are reasonably accurate at the end of the first trimester with margin of error of several days.

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Last updated Aug 11, 2014

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