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U/s on 1/20/14 gave measurement of 11w4d measuring the fetus at 4.8 cm. Could 11/25/13 be conception date? What is the accurate conception date?

1 doctor weighed in
Dr. Jane Van Dis
Obstetrics & Gynecology

In brief: 11/14/13

Based on the information you provided, the 'average' date of conception would be appx 11/14/13.
While 11/25 could be the conception date, it's highly unlikely. Most first trimester ultrasounds are the most accurate ultrasound we have for dating a pregnancy. Typically standard deviation of error is +/- 5 days. Which would be as early as 11/9 or as late as 11/19. Thus, 11/25 is an outlier.

In brief: 11/14/13

Based on the information you provided, the 'average' date of conception would be appx 11/14/13.
While 11/25 could be the conception date, it's highly unlikely. Most first trimester ultrasounds are the most accurate ultrasound we have for dating a pregnancy. Typically standard deviation of error is +/- 5 days. Which would be as early as 11/9 or as late as 11/19. Thus, 11/25 is an outlier.
Dr. Jane Van Dis
Dr. Jane Van Dis
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Dr. Jane Van Dis
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