They should order a 24 hr urine and serum protein electropheresis. The also do random, but I know that the 24 hr reveals more. A decent screening test for cancer as well as many other things. Often neuropathy occurs in cancer patients after chemo and/or radiation. CRP blood test can reveal an inflammatory process and has almost replaced the ESR. I have had many tests, but my symptoms are quite different from yours. I have been a medical technologist (scientist) form 20 yrs. I worked at St Louis University Hospital. I know a lot about body fluids, but little about this neuropathy. I have been educating myself. God Bless and God Speed!!