When would you consider testing for LGI1 antibodies in patients with unexplained neuropathic pain?

I would strongly consider testing CASPR2 and LGI1 antibodies in any patient with unexplained, subacute or chronic "neuropathic-sounding" pain (e.g. described as hot/burning, stabbing, "pins-needles", etc) especially if: exacerbated by heat, experienced diffusely in a "non-length dependent" pattern (...