I had a skin biopsy in May and it came back negative for SFN. An interesting note at the bottom of the report, by the doc who read the results up at Johns Hopkins, was that another biopsy in a year might be informative. So did he think it might be developing or what?

My official DX is Idiopathic Polyneuropathy. When my local neuro referred me to the pain treatment center at Hopkins it was for diffuse large fiber neuropathic pain. I asked and it is large fiber because they ruled out SFN. I plan to talk to he docs up at hopkins when I'm up there in a couple weeks about additional tests to check for autonomic effects of PN as I'm having symptoms and the docs down here don't do any of the tests.