-- of one knows a definite cause for their neuropathy, one wouldn't need all these very specific antibody tests. (And malabsorption, due to gastric bypass, gluten sensitivity, or even bacterial overgrowth after antibiotic regimen, is not an uncommon cause of neuropathy.)

These tests are specialized, but most labs do them now, if the physician requests them--Quest does them (Dr. Latov collaborated on the Quest clinical application paper to explain the rationale for these tests, and I had them done through Quest), and Athena and Specialty labs also do them. The trick is to get most physicians to realize these tests exist. This is why one has to be one's own best advocate--and have access to the Washington University Neuromuscular website, the Neuropathy Association website, the Liza Jane spreadsheets, Neurotalk, etc.