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Re: fetal age calculation per u/s

From: William F. von Almen, II, MD, FACOG (anonymous@obgyn.net)
Sat, 23 Jun 2001 08:44:57 -0500 (CDT)

At Fri, 22 Jun 2001, anon wrote: >
>My LMP began April 29.
>LH surge was May 17 (according to OPK) -- my cycles are usually 30-33
>days long.
>Yesterday, June 21, transvaginal ultrasound indicated fetal age was
>6w4d.
>
>Based on other postings I gather that fetal age is calculated from LMP
>-- which was 7.5 weeks ago. Should I be worried that according to the
>ultrasound the fetus is a week younger than expected?
>
>Thank you.

Anon

I believe a first trimester us has a date variation of between 5 and 7 days. If heartbeat was seen, I would not be too worried 

--
William F. von Almen, II, MD, FACOG
Editorial Advisor-Pregnancy and Birth
Private Practice
New Orleans, La.


*Please understand I can not respond to private emails.


*These comments are for educational purposes only.  They are
not meant to take the place of an examination by a qualified
health care provider.  They are not intended to be the start
of a physician-patient relationship.



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