A1C to see how your dietary goals are working.

Baseline tests don't show much.

Specialty tests:
This is Dr. Latov's protocol:

http://www.questdiagnostics.com/test...eralNeurop.htm

ANA
Cryoglobulins
Immune complexes (IgG, IgM, IgA)
Heavy metals

Those are the first ones to check out of the huge list.

CBC and transferritin + TBI to screen for hemochromatosis.
This might show something.

Vit B12 and Vit D of course.
And blood work for gluten intolerance/celiac.
Perhaps Glenn will have more ideas, as he has done most or all of the testing.

You can print out that page, and take it to the doctor, to make a
preliminary list, say first choice.
Then a second list if nothing shows up in first round.
And likewise down the line. Some things are going to be less
likely for some people.