A member asked:

If ultrasound says i'm 23 weeks pregnant! when did i concieve? is it possible to have conceived 19 weeks ago?

2 doctors weighed in across 2 answers
Dr. Neil Halin answered

Specializes in Interventional Radiology

Not impossible: Us dating is fairly accurate so the likelihood is that 23 weeks is close to the date. I doubt that it is a month off, more likely a week off.

Answered 2/13/2013

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Not likely: Ultrasound measurements for dating in the second trimester of pregnancy(14-28) weeks are generally accurate to within 10-14 days in most cases. Accuracy can be affected by experience of technician doing measurements. It is possible to be off more than that but it is unlikely.

Answered 10/4/2016

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