PREGNANCY-BIRTH Messages for April, 1999: Re: Femur Length in PG

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Re: Femur Length in PG

From: R. (anonymous@obgyn.net)
Wed, 28 Apr 1999 13:13:03 -0500 (CDT)

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In reply to: Kris: "Femur Length in PG"

At Wed, 28 Apr 1999, Kris wrote: >
>During my u/s at 17.5 weeks, my dr measured the baby and everything seem
>normal measuring 17.3 weeks. However, he measured the thigh bones
>(Femur) and said they normally run small at this point in pregnancy. One
>of the thighs measured 18 weeks (which he said was unusual) the other
>measured 16.6 weeks. There is a week difference in this. I know u/s is
>not something you can readily rely on, but the difference in length has
>me concerned. Is it something I should be worried about? Does this
>indicate some sort of problem?
>
>Thanks for you help,
>Kris

The difference in measurement is 3 mm between 17 weeks and 18 weeks. It should be 22 mm at 17 weeks and 25 mm at 18 weeks. This si a difference of about 12% and is within the normal range of error for the measurement of the same bone at 2 different times. Therefore it is no difference.

--
R.Daniel Braun, MD  FACOG
Clinical Professor of Obstetrics and Gynecology
Indiana University School of Medicine
Indianapolis, IN
                                      "Heisenberg might have slept here."
                                          Unknown or maybe Indecisive                                               Unknown

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In reply to: Kris: "Femur Length in PG"

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