<prompt> Answer this question truthfullyWhat other diagnostic studies are available for lymphoplasmacytic lymphoma?  <response>: <reason> Other diagnostic studies for lymphoplasmacytic lymphoma include:Nerve conduction study and electromyography, which demonstrates: Demyelination with sensory involvement more than motor. Fundoscopy, which demonstrates: Dilated, segmented, and tortuous retinal veins giving a sausage link appearance Useful in patients with suspected hyperviscosity syndromePlasma viscosity, which demonstrates: Values 1.5 centipoise: Should be measured in patients presenting with signs and symptoms suggestive of hyperviscosity syndrome or whenever the monoclonal IgM protein spike is 4 gdL. Mutational analysis for the MYD88 gene, since the MYD88 L265P mutation is found in 90 of patients with lymphoplasmacytic lymphoma. In patients with peripheral neuropathy, other causes of neuropathy should be ruled out by performing respective tests as required for: Diabetes Cobalamin Vitamin B12 deficiency Thyroid dysfunction Lyme disease 