Just to add my two cents, my small fiber non-length dependent neuropathy was Dx'd by skin punch biopsies.

The Sjogren's was confirmed somewhat after that.

I eventually had a follow-up appointment with the neurologist who'd done the biopsies that identified SFN. Prior to my visit, I'd found on-line the paper she'd published about small fiber non-length dependent and its link to Sjogren's.

Imagine my surprise when, after reviewing my case, she said that my neuropathy was "idiopathic." I just sat there and looked at her, and have not gone back for any more neurology appointments.