I'm not sure. My neuro (head of the dept @ Hopkins) is adamant about pre-diabetic causes, and when he saw that I was hospitalized (2000) for pancreatitis due to an alcoholic binge (I was self medicating with booze, had been suffering for years, & mis-diagnosed until that hospitalization) and Bingo ! 'Alcoholic Neuropathy'.........Go no further.
I'm, AN & pre-diabetic (high normal range).

Supposedly, he says I do not fit the mold for hereditary(?) Even tho I'm of Ashkenazic Middle-European Descent.(?)

My PCP has given me other tests that I requested (celiac, etc- she works with me), but do not know if I've ever had these two specific tests.

I'll have to ask her, and if not, get them done-but I do not have dry eyes. Crusty at times, but my ophthalmologist says its due to blephemitis and MRSA.(from when I spent 3 mos visiting my son in hosp. - daily. I Caught it from him. He caught it in the hosp.).