This happened back in the late 90's and about all I recall is the Spinal Tap to make sure it wasn't Multiple Sclerosis, and there were lots of blood tests but I think my Neurologist was very good at diagnosing. We also spent lots of time trying different meds and he referred me to an Anesthesiologist to manage my pain. I was also told CIDP is related to Guillain-Barre syndrome. I was told CIDP is mostly pain while G-B Syndrome can also cause muscle loss in the legs. Sorry I can't recall more...