2 doctors weighed in:

Can conception range be over a week off if gestational age is confirmed by early first trimester ultrasound?

2 doctors weighed in
Dr. Lawrence Schappa
Obstetrics & Gynecology
1 doctor agrees

In brief: Yes

In general, ultrasound established dates should take precedence over menstrual dates if the discrepancy is greater than 7 days if done in the first trimester (first 12 weeks) and more than 10 days if done in the second trimester.

In brief: Yes

In general, ultrasound established dates should take precedence over menstrual dates if the discrepancy is greater than 7 days if done in the first trimester (first 12 weeks) and more than 10 days if done in the second trimester.
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