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Re: cervical length during pregnancy

From: J. (anonymous@obgyn.net)
Thu, 30 Apr 1998 15:51:52 -0500 (CDT)


Kate,

Cervical measurements via ultrasound need to be done with an empty bladder to be most accurate or even better accuracy with an endovaginal probe. Excessive bladder distention gives a false elongation of the cervix as well as a false appearance of placental previa in some instances. The cervix shortens in the third trimester (effacement). The docs will be able to give more information of the stages of cervical changes but 3 cm is a pretty average length. Our ultrasound practice becomes concerned if the cervical length is less than 2.5 cm.

(And off note....the person performing your ultrasound, if registered, is called a sonographer. 'Ultrasound technician' refers to someone that has not taken the registry boards. :)

Janet

At Thu, 30 Apr 1998, Kate wrote: >
>When I had my 20 week ultrasound, the technician measured my cervix and
>said it was about 3(I am assuming cm?) The doctor said my cervix looked
>good- long and closed. I was wondering- does the cervix gradually get
>shorter the closer
>to delivering? and I have also heard that 4cm is supposed to the normal
>length? Thanks for your help.
>
>--
>Kate
>




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