Re: 2 quick questions on ultrasound accuracy and longish cycles

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• In reply to: anonymous: "2 quick questions on ultrasound accuracy and longish cycles"

The thing that makes the U/S so accurate is that it doesn't take the cycle into account at all, just fetal size.

>
>2 - also, I called my docs office to ask about this and the nurse said
>no, it's not DAYS, it's WEEKS - early vaginal ultrasound dating is only
>accurate +/- 2 weeks. Why would that be so different from all the
>postings here???? please help. thank you for your time.

U/S at 6 weeks is accurate to +/- 2-3 days. It is 2-3 weeks accurate at 18-20 weeks gestation.

--
William D. McIntosh, MD, FACOG

This is for educational purposes only, and is neither designed nor intended to replace consultation with and examination by a licensed medical professional.

Please, no private e-mails.  I will not be able to answer them.

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