--take a look at this site:


http://neuromuscular.wustl.edu/nother/autoantibody.html

http://neuromuscular.wustl.edu/antibody/mprotein.htm

I would get tested for the monoclonal antibodies/m-proteins in particular; that is done by immunofixation electrophoresis and should be readily available at most labs. The tests for antibodies to specific elements of peripheral nerve are more specialized and may have to be done at a more specialized facility.