So, Therapath Lab offered to also do a Sweat Gland Nerve Fiber Density report, using the same biopsy specimin I had already given them. They said it could provide more sensitive info for patients whose skin biopsy was negative. So of course I said YES, do it! 2 days later they send a report to my Dr. stating I have a "low normal" amount of sweat glands, which may indicate SFN. But My Dr. says still not SFN. I just don't know what to think now.