PREGNANCY-BIRTH Messages for June, 2001: 2 quick questions on ultrasound accuracy and longish cycles

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2 quick questions on ultrasound accuracy and longish cycles

From: anonymous (anonymous@obgyn.net)
Tue, 26 Jun 2001 16:25:38 -0500 (CDT)

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Reply: William McIntosh, MD: "Re: 2 quick questions on ultrasound accuracy and longish cycles"

1 - my cycles are usually 31-33 days long. I know from other postings that dating the age of the fetus with an early vaginal ultrasound (at 6 or 7 weeks LMP) is accurate to +/- 3 or 4 days. is that assuming a 28 day cycle? in other words, if my cycle is longer than 28 days, then does the accuracy rate widen a bit, to maybe +/-6 or 8 days?

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.

Next message: Jada: "Re: When will there be a heartbeat"
Previous message: anonymous: "Period bleeding"
Next in thread: William McIntosh, MD: "Re: 2 quick questions on ultrasound accuracy and longish cycles"
Reply: William McIntosh, MD: "Re: 2 quick questions on ultrasound accuracy and longish cycles"

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