I asked my doctor about this and she said that your pelvis changes shape and size during abour so it is highly inaccurate anyway.
 
Not a midwife but had asked about this to prove that my baby would have fitted - so i wanted to say measure my pelvis because I think the c/s was not needed and that his 36cm head would have fitted - and 2 weeks after birth it should have been still acurate but I was toild that it was not.  I guess it just depends on what they want the information for.  If it is to convince you to have intervention it is acurate and if it is to question them it is not.
 
As far as i know the only true way to know if a baby is going to fit or not is to measure the pelvis after the cervix is fully dilated and the hand can be inserted to feel the size of the babies head and the presentation of the presenting part - if then the size is different you have an acurate and true reason for a c/s.  my sister had this happen and the baby who had a 38cm head did not fit - her gp was great and as she had delivered 3 babies vaginally he did not think she would require a c/s.  It was only when he felt the head and the pelvis after full dilation that he could acurately say - "It wont fit."  
 
Anything else is mearly a guess - it may be an educated guess but it is a guess all the same because the pelvis does become pliable and stretch during labour. 
 
Hope that helps.
 
Regards
Rhonda.
 
-------Original Message-------
 
Date: Thursday, 22 August 2002 11:23:50 PM
Subject: [ozmidwifery] back on the list
 
After having returned from Northern California from a
6 month working trip with my husband and children I am
glad to be back on the list again. I am a birth doula
and will one day further my support for birthing women
in one way or another.

Presently I have a lady who is informing herself about
her VBAC options. During her prenatal care she has
been advised to have the size of her pelvis measured
(pardon the lack of medical terminology for this
proceedure). What she knows so far and feels in her
heart is that she does not think this information will
benefit her as 'time will tell'. Yet the midwives
are supporting the doctor in this request of her.
This lady would like to know if there is evidence to
support or refute this proceedure and how can she
obtain this information.

Thanks for your help, Erika

ps I had the joy of attending 10 births during my time
in the USA. I am finding that the more I experience
and the more I learn, I realize how little I have
experienced and how much more there is to learn.

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