Dear Appletwitches,This link is to one of the better and more authoritative articles about impaired glucose tolerance (aka prediabetes) and its association with small fiber sensory neuropathy. To offer a little comfort, however, my endochrinologist, the head of a diabetes clinic at a major metro hospital, told me that it would be unusal for pre-diabetes to cause SFN in someone with normal A1C, c-peptides, lipid panel and near-normal fasting glucose, so you might want to have that blood work done, in addition to having a 2-hr oral glucose tolerance test. I've been driving myself crazy trying to ascertain for sure what causes my tingling in feet and hands -- pre-diabetes? BFS? compressed nerves in lower back and neck? Even wine consumption, although moderate for me, is now causing me to wonder if that's the cause. At this point, I've given up and just try to take care of myself. I did have a skin biopsy done to measure in my lower calf epidermal nerve fiber density and the result was low-normal two years ago, suggestive of SFN, according to Therapath, NY, NY., the lab that does the test.Good luck to you.