Thank you en bloc and glenntaj...My neuro just referred to it as a nerve biopsy and seemed surprised when I questioned whether there would be permanent effects. I'm cancelling the biopsy. I don't need anymore pain. I don't have the symptoms of vasculitis and amyloidosis is pretty rare from what I've read. I was planning on going to the Jack Miller Center for PN (Univ. of Chicago) after the biopsy anyway, so I'll just skip the biopsy and see what they say.