How Is Neuropathy Diagnosed?

Many people arrive with only part of the picture. Some were told “your EMG was normal” while their feet still burn. Others have an abnormal nerve study but no explanation for why. Each of those situations calls for different questions.

At Innovative Nerve & Joint Centers, we think of a neuropathy evaluation as assembling pieces of a puzzle. We use the right information to answer the right questions, and we refer you when your findings point to care outside our scope.

What Happens During a Neuropathy Evaluation?

It starts with your story. Before any equipment is used, your history is one of the most useful diagnostic tools. We will ask:

• When did the symptoms begin, and did they start suddenly or gradually?
• Did they begin in one foot or both, or in the toes and move upward?
• Are they constant or intermittent, and are they worse at night?
• Is there back pain, and does walking make symptoms better or worse?
• Has your balance changed?
• Have you had chemotherapy, or do you have diabetes or prediabetes?
• Do you have nutritional deficiencies, or take medications that could matter?
• Is there a history of alcohol use, toxin exposure, trauma, or autoimmune disease?
• Does anyone in your family have similar neurological problems?

The timeline often gives the first clue. Burning that began during chemotherapy points in one direction. Numbness that starts in both toes and slowly climbs points in another. Pain that begins in the back and shoots down one leg raises a different question altogether.

What Tests Are Done During a Neurological Exam?

The neurological exam looks at how your nervous system is working, not only whether something hurts. Depending on your case, we may check light touch, pinprick, vibration, temperature, and joint position sense. We also check reflexes, muscle strength, coordination, walking, and balance.

These tests sample different nerve fibers. Some fibers carry pain and temperature, some carry vibration and position sense, some control muscles, and some regulate automatic functions such as sweating. Two people who both have “neuropathy” can have very different findings. The exam is a snapshot, so comparing the same measures over time is often more useful than any single result.

What Is the Toronto Clinical Neuropathy Score?

The Toronto Clinical Neuropathy Score combines your symptoms, reflexes, and bedside sensory tests into a structured severity score. Its main value is a baseline. When the same measures are repeated later, we can compare findings instead of relying only on “I think it feels a little better.”

The score does not identify the cause, and it does not replace electrodiagnostic, laboratory, vascular, or small-fiber testing when those are needed.

What Does an EMG Show, and Can You Have Neuropathy With a Normal EMG?

An EMG and a nerve-conduction study are often done together, but they measure different things. A nerve-conduction study sends small electrical impulses through selected nerves and records how quickly and strongly large nerves carry the signal. Needle EMG samples electrical activity in muscles to assess the nerves and nerve roots that supply them.

Together they help show whether large-fiber damage involves the nerve fiber itself or its insulating myelin covering, and whether the problem is focal or more widespread. EMG can also help sort out whether symptoms come from a compressed spinal nerve root rather than peripheral neuropathy. It does not directly measure small pain and temperature fibers, circulation, or the cause of a neuropathy. Neither test is a universal screen, and the nerves sampled and the suspected diagnosis affect how results are read.

Yes, you can have neuropathy with a normal EMG. Routine studies mainly assess larger fibers, so burning pain, altered temperature sensation, or autonomic symptoms from small-fiber dysfunction can occur with normal results. A normal test still has value, because it makes substantial large-fiber damage, radiculopathy, or certain entrapments less likely in the areas sampled. It means the structures measured did not show the expected abnormalities. It does not mean every nerve is working normally.

What Is Small-Fiber Neuropathy, and How Is It Tested?

Small fibers include thinly myelinated A-delta fibers and unmyelinated C fibers. They are involved in pain, temperature, sweating, and other automatic functions. When they are affected, symptoms can include:

• Burning, electric, or prickling pain
• Heat or cold sensitivity
• Altered sweating
• Pain from light contact

Diagnosis still requires a matching clinical pattern and a search for causes. A specialized test result should not be read in isolation. When the pattern suggests small-fiber involvement, clinicians may consider a skin biopsy, which measures the density of nerve endings in the skin, or autonomic testing.

Sudomotor testing assesses the nerves that help control sweating and gives information about autonomic small-fiber function. SUDOSCAN, for example, measures electrochemical skin conductance related to sweat-gland function. Hydration, medications, skin temperature, and other autonomic conditions can affect results. It is useful supporting information, not stand-alone proof of a cause, severity, or treatment response. At our office, we use sudomotor testing to quantify damage to small fibers.

What Blood Tests Should Be Considered for Neuropathy?

Nerve testing shows what the nerves are doing. Blood work helps look for why. Commonly considered tests include glucose, vitamin B12 (with metabolites when appropriate), and serum protein studies. Depending on your history, a blood count, metabolic panel, thyroid studies, folate, inflammatory markers, infectious testing, or vitamin B6 may be added.

Your medications, supplements, alcohol use, kidney function, nutrition, and family history all affect which tests make sense. Blood tests support or rule out a diagnosis. They are not a stand-alone way to diagnose neuropathy, and no panel detects every type. An abnormal result matters only if it plausibly explains your nerve pattern.

Finding a contributor you can change matters. A vitamin deficiency that is never corrected, or glucose control that keeps worsening unaddressed, can undermine everything else.

How Are Circulation and Balance Evaluated?

Neuropathy and peripheral artery disease can both cause leg and foot symptoms, and they can occur together. We look at pulses, skin color and temperature, wounds, capillary refill, symptoms that come on with walking, and cardiovascular risk factors. When needed, an ankle-brachial index, toe pressures, Doppler studies, or vascular imaging provide objective information. We also use thermography to look at peripheral blood flow through temperature patterns.

Temperature changes alone do not diagnose arterial disease, and thermography is not a replacement for vascular testing when arterial disease is suspected. A cold foot, weak or absent pulses, leg cramping that walking predictably triggers, skin-color changes, and slow-healing wounds should not simply be labeled neuropathy.

Balance matters too. Someone’s pain score can improve because their feet became more numb, while their function has not. A balance assessment may include standing with different foot positions, eyes open and closed, timed transfers, turning, gait speed, and obstacle negotiation. We also look at foot sensation, ankle strength, vision, blood-pressure changes, footwear, and prior falls. Testing is guarded and adapted to you, and provoking a fall is never the goal. At our office, we use a computerized force plate to test balance.

When Do You Need an MRI for Neuropathy Symptoms?

Most length-dependent peripheral neuropathies do not need an MRI to diagnose. Imaging becomes more useful when symptoms suggest:

• Spinal cord disease or a nerve-root lesion
• Severe focal compression
• A mass or infection
• Trauma or another structural cause

Spine MRI can show herniated discs, spinal stenosis, nerve-root compression, and tumors. If your symptoms strongly suggest a nerve-root problem, looking only at the foot would miss part of the answer. Age-related MRI changes are also common, so a finding matters only when it fits your symptom pattern and exam.

What Happens After Your Neuropathy Evaluation?

We review the findings with you and explain what type of nerve dysfunction appears to be present, how advanced it looks, whether the symptoms could come from another source, and what may still be changeable. Our evaluation may include structured sensory examination and scoring, balance and movement assessment, sudomotor testing, review of circulation-related findings, and review of laboratory work, EMG, or imaging done elsewhere.

Some presentations need more than we can provide. These include rapid progression, significant weakness, markedly asymmetric symptoms, unusual distribution, prominent autonomic symptoms, strong family history, suspected autoimmune neuropathy, or findings that do not fit a common pattern. Additional testing may then include genetic testing, skin biopsy, autonomic studies, specialized blood work, cerebrospinal-fluid testing, or, in uncommon cases, nerve biopsy. We will refer you when that is the right step.

Seek urgent evaluation for rapidly progressing weakness, new bowel or bladder dysfunction, saddle numbness, trouble breathing or swallowing, a suddenly cold or pale limb, a new infected or nonhealing wound, or severe new symptoms after trauma. New one-sided deficits or stroke symptoms require emergency care.

Frequently Asked Questions About Neuropathy Diagnosis