Hello jhill, I had a nerve biopsy as part of the procedure in the diagnosis of CIDP. the pathology report was positive for demyelination of the nerve axons. There was pain involved after and I was fully aware that would be the case. Both my feet have dropped and I now use braces that lift my toes, these help me to walk more normally. If you go ahead with the biopsy have good talk to the Surgeon, I hope I have been of assistance and best wishes to you Rob396