@ea1 - Thank you for sharing this information. I went for many years before seeking a diagnosis and my Mayo neurologist also did not use a skin punch biopsy as part of my testing for SFN. If you have the link to the article with the table/chart, I would appreciate being able to read it.

Updated response -- I found the article that shows the table - Thank you!

-- Utility of Skin Biopsy in Neuromuscular Disease:
https://practicalneurology.com/articles/2019-aug-july/utility-of-skin-biopsy-in-neuromuscular-disease