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Re: EFWFrom: Allen Worrall (jworrall@alaska.net)Wed Aug 28 11:11:52 2002
I presume these were patients who delivered within a few days of your examination. I find that doing ultrasound measurements that late in pregnancy can be difficult if the position of the fetus is not favorable. Particularly the AC: you will be lucky if you can see the entire periphery of the abdomen outlined by amniotic fluid. If the baby is prone, it may be difficult or impossible to obtain a lateral axial view of the head for the BPD/HC, or you may have to obtain the BPD/HC from a posterior or anterior axial view. And the femur might be buried under the baby, etc, etc. My machine gives a +/- with the EFW. I am not sure what the latest thoughts are, but I understood EFW could be +/- 20%. I have had 1 or 2 cases that delivered shortly after I did an ultrasound exam, but I did not bother to check the delivery weight against my EFW. Allen
>----- Original Message -----
> ok new topic - what's the largest error of weight estimation by
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