<prompt> All are impoant etiological diagnostic tests in a case of peripheral neuropathy, EXCEPT:HSV serologyCryoglobulinsWestornblot for lyme diseaseCMV titer  <response>: Impoant initial tests in case of peripheral neuropathy: Serum electrolytes, renal and hepatic function, fasting blood glucose FBS, HbA1c, urinalysis, Thyroid function tests, B12, folate, erythrocyte sedimentation rate ESR, Rheumatoid factor, antinuclear antibodies, serum protein electrophoresis, and urine for BJP. Patients with mononeuropathy multiplex should have : Antineutrophil cytoplasmic antibodies ANCA, cryoglobulins, hepatitis serology, Western blot for Lyme disease, HIV, and cytomegalovirus CMV titer. HSV has not been given as an etiological test in peripheral neuropathy. Ref: Harrison, Edition-18, Page-3450 