Diagnostic Testing for Peripheral Neuropathy

Initial Clinical Assessment

The American Diabetes Association recommends screening for peripheral neuropathy at diagnosis for type 2 diabetes and after 5 years for type 1 diabetes, then annually thereafter, as up to 50% of diabetic peripheral neuropathy cases are asymptomatic 3
The clinical diagnosis of loss of protective sensation (LOPS) requires 10-g monofilament testing at multiple plantar sites on both feet, plus at least one additional test, such as 128-Hz tuning fork for vibration, pinprick sensation, or temperature sensation 1, 3, 5

The American College of Physicians recommends ordering fasting blood glucose or HbA1c, vitamin B12 level with metabolites, and serum protein electrophoresis with immunofixation on all patients with suspected peripheral neuropathy 2
The American Academy of Neurology recommends comprehensive metabolic profile, including renal function for uremic neuropathy, and thyroid-stimulating hormone to rule out hypothyroidism 2

The American Association of Neuromuscular and Electrodiagnostic Medicine recommends ordering nerve conduction studies and electromyography when clinical features are atypical for length-dependent symmetric polyneuropathy or when diagnosis remains unclear after initial evaluation 2, 6

The American College of Rheumatology recommends lumbar puncture with CSF analysis for chronic inflammatory demyelinating polyneuropathy or Guillain-Barré syndrome when autoimmune or inflammatory causes are suspected 2
The American Heart Association recommends ankle-brachial index in patients ≥50 years or those <50 years with PAD risk factors when peripheral arterial disease is suspected 7, 5

The American Academy of Neurology recommends pregabalin, duloxetine, and gabapentin as first-line pharmacologic treatments for neuropathic pain, with realistic expectations that pain often persists despite medical management 3, 7

The American Diabetes Association recommends foot inspection at every visit, referral to foot care specialists, and specialized therapeutic footwear for high-risk patients with history of ulceration/amputation, severe neuropathy, foot deformities, peripheral arterial disease, or poor glycemic control 1, 7, 5