Written by Dr. Matthew Capozzi, DPM, FACFAS, CWS (board-certified foot surgeon and wound specialist) · Medically reviewed by the CircuFiber Scientific Advisory Board · Updated: October 28, 2026
A diabetic neuropathy test checks whether high blood sugar has damaged your nerves, and how badly. Most testing starts with a simple in-office foot exam of sensation, reflexes and skin, and moves on to nerve conduction studies, electromyography (EMG), quantitative sensory testing, autonomic testing or, less often, a skin biopsy when more detail is needed. Testing matters because diabetic neuropathy can affect your ability to sense pain, compromise your balance and limit your mobility, and finding it early gives you the best chance to protect your feet.
Key Takeaways
- Diabetic neuropathy is nerve damage caused by prolonged high blood sugar, and approximately 50% of people with diabetes experience some degree of it during their lifetime.
- Testing usually begins with a physical foot exam: a check of the feet for injury, reflexes, muscle strength and sensation, often using a monofilament and a tuning fork.
- Specialist tests include nerve conduction studies, electromyography (EMG), quantitative sensory testing (QST), autonomic testing and, in unclear cases, a skin or nerve biopsy.
- Early detection helps prevent complications such as foot ulcers, infections and amputation, and makes treatment more effective.
- Get tested if you notice numbness, tingling, burning pain, muscle weakness, loss of balance or a foot sore that is slow to heal, and have a diabetic foot exam at least once a year.
What is a diabetic neuropathy test?
A diabetic neuropathy test is any exam or procedure that measures how well your nerves are working, to find nerve damage caused by diabetes. When blood sugar levels remain high over an extended period, nerves may become damaged. With accurate testing, we can identify the presence of neuropathy, assess its severity, and initiate the proper course of treatment. It's essential to undergo regular tests as part of your diabetes management plan, ensuring optimal health in the long run.
There are a variety of tests available for diagnosing diabetic neuropathy, such as nerve conduction studies, electromyography, and sensory testing. Healthcare providers typically assess the patient's medical history, conduct a physical examination, and perform additional tests such as nerve conduction studies or electromyography. These tests help gauge nerve function and detect any abnormalities.
What types of diabetic neuropathy can a test detect?
Testing can detect all four main types of diabetic neuropathy: peripheral, autonomic, proximal and focal. Diabetic neuropathy pertains to nerve damage that arises as a complication of diabetes. It's a common issue with approximately 50% of individuals with diabetes experiencing some degree of neuropathy during their lifetime. The longer a person has diabetes, the higher their chances are of developing this condition.
- Peripheral neuropathy: Affects nerves of the extremities and is the most frequent form. It may cause pain, numbness, and weakness, particularly in the hands and feet.
- Autonomic neuropathy: Affects the nerves that regulate internal organs, potentially impacting heart rate, digestion, and blood pressure. Read more about diabetic autonomic neuropathy.
- Proximal neuropathy: Influences the nerves in the thighs, hips, and buttocks, often causing pain and weakness.
- Focal neuropathy: Targets a single nerve, typically in the wrist, thigh, or foot.
Diabetic neuropathy symptoms can range from mild to severe, and the type and severity often depend on the nerves damaged. To emphasize the importance of early detection, let's look at some key numbers:
| Percentage of Diabetic Patients | Type of Neuropathy |
|---|---|
| 50% | Peripheral neuropathy |
| 30% | Autonomic neuropathy |
| 20% | Proximal neuropathy |
| 10% | Focal neuropathy |
These statistics highlight the significance of diabetic neuropathy among people with diabetes in the U.S. With half of diabetic patients facing peripheral neuropathy, it's vital to take proactive measures to identify and manage this condition.
Which symptoms mean you should get a neuropathy test?
You should ask for a neuropathy test if you have diabetes and notice numbness, tingling, sharp pain, unusual sensitivity to touch, muscle weakness or a foot sore that is slow to heal. Diabetic neuropathy can manifest in various ways, and recognizing the early signs is crucial for initiating timely treatment.
Numbness and tingling
A frequent early sign of diabetic neuropathy is a sensation of tingling, pricking, or numbness in the hands, feet, arms, or legs. These symptoms result from nerve damage caused by elevated blood sugar levels. See our guide to numb feet and diabetes.
Muscle weakness and loss of balance
Gradual loss of muscle strength, especially in the feet and legs, might be an early symptom of diabetic neuropathy. Muscle strength may decrease over time, leading to reduced coordination and balance. Muscle cramps are another early sign.
Sharp pains and sensitivity to touch
Patients with diabetic neuropathy often report experiencing sharp, jabbing, and burning pains, predominantly in the legs and feet. These pains can worsen at night, affecting sleep quality. Even slight pressure or touch against affected areas can cause discomfort due to increased skin sensitivity, which is another indication of neuropathy.
Ulcers or infections
Foot ulcers or infections are a common complication of diabetic neuropathy. Persistent foot injuries should be treated promptly, as untreated infections could lead to amputation. Learn more about the diabetic foot ulcer.
Autonomic and focal symptoms
Some neuropathy symptoms do not involve the feet at all. Autonomic neuropathy symptoms include digestive issues, urinary problems, and changes in blood pressure. Focal neuropathy symptoms include sudden weakness or pain in specific body parts. Diagnosing diabetic neuropathy can be challenging due to its diverse symptoms, which is why several tests are used together.
How do doctors test for diabetic neuropathy?
Doctors test for diabetic neuropathy by starting with a physical exam of the feet and legs, then adding nerve and sensory tests when the exam or your symptoms call for more detail. The table below compares the most common tests.
| Test | What it checks | How it is done |
|---|---|---|
| Monofilament test | Protective sensation (loss of feeling) in the feet | A thin nylon filament is pressed against several spots on the sole of the foot during a routine foot exam |
| Vibration (tuning fork) test | Vibration sense, often one of the first sensations lost | A vibrating tuning fork is placed on a bony point, usually the big toe |
| Nerve conduction studies | The speed and strength of nerve signals | Small electrodes on the skin send mild electrical impulses through the nerve |
| Electromyography (EMG) | Muscle health and the nerves that control muscles | Records the electrical activity in muscles, often done with nerve conduction studies |
| Quantitative sensory testing (QST) | Sensitivity to temperature, vibration and pressure | You report the threshold at which you first feel each sensation |
| Autonomic tests | Nerves that control heart rate, blood pressure, digestion and sweating | Heart rate variability, Valsalva maneuver, tilt table test and sudomotor (sweat) testing |
| Skin or nerve biopsy | Nerve fibers under a microscope | A small sample of skin or nerve tissue is removed; usually reserved for unclear cases |
Physical foot exam (monofilament and tuning fork)
A physical examination is vital to assess the overall health of a person with diabetes and is usually the first diabetic neuropathy test. The doctor will:
- Examine the feet for any signs of injury, infection, or ulcers
- Check the blood pressure and heart rate
- Test reflexes in the arms and legs
- Assess muscle strength and sensation
Sensation is commonly checked with a monofilament, which tests whether you can feel light pressure on the sole of the foot, and a tuning fork, which tests whether you can feel vibration. Both are quick, painless and done in the office. For a step-by-step look, read what a diabetic foot exam involves.
Nerve conduction studies
Nerve conduction studies measure how well nerves transmit electrical signals. During these tests, small electrodes are placed on the skin over the nerves, and electrical impulses are then sent through the nerves. The speed and intensity of the transmitted signals are recorded, helping to identify any nerve damage or dysfunction.
Electromyography (EMG)
Electromyography (EMG) evaluates muscle health and nerve function by recording electrical activity in muscles. It is often performed alongside nerve conduction studies to show whether weakness comes from the nerve or the muscle.
Quantitative sensory testing (QST)
Quantitative sensory testing (QST) measures the nerves' sensitivity to various stimuli, such as temperature, vibration, and pressure. During QST, patients are exposed to different sensations, and their threshold for feeling the sensation is recorded. This test can help detect early signs of nerve damage before it becomes more severe.
Autonomic testing
Autonomic testing evaluates the function of the autonomic nervous system, which controls essential body processes such as blood pressure, heart rate, and digestion. People with diabetic neuropathy may experience problems with these processes due to nerve damage. Autonomic tests include:
- Heart rate variability test
- Valsalva maneuver
- Tilt table test
- Sudomotor testing
Skin or nerve biopsy
A biopsy is another helpful method for assessing nerve damage. A small sample of nerve tissue or skin is taken for examination under a microscope. This test is less common and usually reserved for cases where other tests are inconclusive or when specific forms of neuropathy are suspected.
Why is early detection of diabetic neuropathy important?
Early detection of diabetic neuropathy is crucial to managing its effects and ensuring patients maintain a high quality of life. Here's why it's essential:
- Preventing complications: Identifying neuropathy symptoms before they progress reduces the chances of developing more severe complications, such as ulcers, infections, and amputations.
- Optimizing treatment: The sooner neuropathy is detected, the more effective treatment can be. Early intervention allows us to manage blood sugar more efficiently and limit the nerve damage resulting from diabetes. See the current diabetic neuropathy treatment options.
- Managing pain: When neuropathy is detected early on, there’s a greater chance of alleviating pain and maintaining normal daily activities.
How can you lower your risk of neuropathy getting worse?
You can lower your risk of diabetic neuropathy developing or progressing by keeping blood sugar in range and protecting your feet every day. Regular diabetes management is essential in reducing the onset and progression of neuropathy. Control of blood glucose levels and maintaining a healthy lifestyle can help lessen nerve damage. The following can also help lower the risks:
- Monitoring and controlling blood pressure
- Quitting smoking (see how smoking and diabetes are linked)
- Maintaining a healthy weight
- Exercising regularly
- Following a balanced diet
In order to improve early detection rates, we suggest the following steps:
- Regular foot examination: Check your feet daily for any cuts, blisters, redness, or swelling. This simple practice can help you identify signs of neuropathy and prevent severe complications.
- Diabetes management: Maintain healthy blood sugar levels by adhering to a balanced diet, taking medications as prescribed, monitoring glucose regularly (why checking your blood sugar matters), and engaging in physical activity.
- Consult your healthcare provider: Reach out to your doctor if you experience any symptoms or have concerns related to diabetic neuropathy, as they can guide you in managing the condition and help prevent further complications.
For daily habits that protect nerve-damaged feet, see our guide to diabetic neuropathy self-care.
Can diabetic socks help if you have neuropathy?
Diabetic socks can help protect feet that have lost sensation, but they do not replace testing or treatment. A good diabetic sock has a non-binding top that does not restrict blood flow, is seamless to avoid rubbing skin you may not feel, and wicks moisture to keep feet dry. CircuFiber diabetic socks are woven with Circulight® IR fibers containing thermoreactive mineral particles that absorb body heat and reflect it back into the foot as far-infrared energy, which promotes a temporary increase in local blood flow and circulation. In a randomized, double-blinded, placebo-controlled trial at Yale School of Medicine (ClinicalTrials.gov NCT04460612, published in Diabetes & Vascular Disease Research, 2023), the active textile significantly increased transcutaneous oxygen in the feet of people with diabetes compared with a placebo sock, with the difference visible at 40 minutes and significant at 60 minutes. CircuFiber socks also carry the APMA Seal of Acceptance.
When should you see a doctor about a neuropathy test?
See a doctor or podiatrist for a neuropathy test if you have diabetes and notice numbness, tingling, burning or sharp pain, muscle weakness, loss of balance, or any foot cut, blister or sore that is not healing. Any foot wound with redness, swelling or drainage needs same-day care. People with diabetes should also have a comprehensive foot exam at least once a year, even without symptoms, and more often if neuropathy has already been found. Not sure who to see? Read who treats diabetic neuropathy.
Frequently asked questions about diabetic neuropathy tests
How do you test for neuropathy in the feet?
Neuropathy in the feet is usually tested during a physical foot exam. The doctor examines the skin, checks reflexes and muscle strength, and tests sensation with a monofilament (light pressure) and a tuning fork (vibration). If results are abnormal or unclear, nerve conduction studies, EMG or quantitative sensory testing may follow.
Will a nerve conduction test show neuropathy?
A nerve conduction study can show neuropathy that affects the larger nerve fibers by measuring the speed and intensity of nerve signals. It may miss damage limited to the small nerve fibers, which is one reason doctors sometimes add quantitative sensory testing or a skin biopsy when symptoms do not match a normal result.
Is there a blood test for diabetic neuropathy?
No single blood test diagnoses diabetic neuropathy; it is diagnosed from your symptoms, a physical exam and nerve tests. Your doctor may still order blood work to check how well your blood sugar is controlled and to rule out other causes of nerve symptoms. Ask your doctor which tests make sense for you.
Can you test for neuropathy at home?
You cannot diagnose neuropathy at home, but you can watch for it. Check your feet daily for cuts, blisters, redness or swelling, and tell your doctor about numbness, tingling or pain. A formal diabetic neuropathy test should be done by a healthcare professional.
How often should people with diabetes be tested for neuropathy?
People with diabetes should have a comprehensive foot exam that checks for neuropathy at least once a year. If neuropathy, poor circulation or a past foot ulcer has already been found, your doctor or podiatrist will usually check your feet more often.
Can diabetic neuropathy be reversed once a test finds it?
Established nerve damage is difficult to reverse, but early detection gives you the best chance to slow its progression and manage pain. Keeping blood sugar in your target range is the most important step. Read more on whether diabetic neuropathy can be reversed.
References, studies and sources
- Diagnosing diabetic neuropathy (review article). PubMed Central PMC6513498. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6513498/
- Mayo Clinic. Diabetic neuropathy: Symptoms and causes. https://www.mayoclinic.org/diseases-conditions/diabetic-neuropathy/symptoms-causes/syc-20371580
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Peripheral Neuropathy. https://www.niddk.nih.gov/health-information/diabetes/overview/preventing-problems/nerve-damage-diabetic-neuropathies/peripheral-neuropathy
- American Diabetes Association. Neuropathy. https://diabetes.org/about-diabetes/complications/neuropathy
- Yale School of Medicine. Randomized, double-blinded, placebo-controlled trial of an infrared textile on transcutaneous oxygen in people with diabetes. ClinicalTrials.gov NCT04460612. https://clinicaltrials.gov/study/NCT04460612
About the author: Dr. Matthew Capozzi, DPM, FACFAS, CWS, is a board-certified foot surgeon through the American Board of Foot and Ankle Surgery. He is a Diplomate of the American Academy of Wound Management and Fellow of the American College of Foot and Ankle Surgeons. He completed a three-year residency program in Foot and Ankle Reconstructive Surgery at St. Francis Hospital & Medical Center in Hartford, CT in 2010. Dr. Capozzi is a board-certified Wound Specialist® granted by the American Academy of Wound Management.
Healthcare disclaimer: Always consult your physician before beginning any program. This general information is not intended to diagnose any medical condition or to replace your healthcare professional. If you experience any pain or difficulty, stop and consult your healthcare provider. CircuFiber socks are a general wellness product intended to promote a temporary increase in local blood flow and circulation; they are not intended to diagnose, treat, cure, or prevent any disease. Individual results vary.
