It's not just that there are so many different medical opinions concerning neuropathy that are confusing - there are more than 100 different types of neuropathy and just as many different causes. That's why trying to get a definitive diagnosis can be difficult. Symptoms, prognosis and treatments can all vary depending on type and/or cause. I think this may also be part of the reason why there is limited funding for research in spite of the prevalence of the condition.

Sorry for changing tack there Phil. MrsD is right about the lab ranges for B12 being too low. I came across an Aust. Govt. paper that recommended 200pmol/L as a minimum safe level. (the 400 pg/ml that MrsD recommends converts to 295 pmol/L).

Hope your PET scan uncovers something.