Are there specific findings that would make you suspicious of IgD or IgE monoclonal gammopathies?

I mostly consider an IgD or IgE monoclonal gammopathy in a patient who has a measurable serum M-spike on serum protein electrophoresis but a serum immunofixation that only shows a light chain band (either kappa or lambda). Since patients with light chain-only myeloma usually have at most a tiny mono...