I also had only one biopsy, above the right ankle. This was what my neurologist asked for, and I knew nothing about SFN and this test.

Actually I am glad that I had only one biopsy, this was more then enough for me. I had a massive bleeding, I was sensitive to the antibiotic ointment, it took a long time to heal, and for a couple of months the pain disturned my sleep and activities that streach the area such as walking, going down the stairs, or yoga. Sometimes the area is still annoying and it has been almost a year since my biopsy.