DPN Check nerve conduction testing
DPN Check is a point-of-care nerve conduction test that helps detect diabetic peripheral neuropathy early, with results in 30–60 seconds.
Diabetic peripheral neuropathy is nerve damage caused by prolonged high blood sugar, and it very often develops silently — many patients have measurable nerve involvement well before they notice numbness, tingling, or pain. Because symptoms can lag behind the underlying nerve damage, I recommend objective nerve testing as part of routine diabetes care, not only once symptoms appear, since earlier detection gives us a better chance to slow progression and protect your feet.
Your nerve assessment pathway
Patient Visit
We review your diabetes history, symptoms (if any), and foot risk together, and decide whether DPN Check testing is appropriate for you today.
DPN Check Test
A brief, painless point-of-care test measuring sural nerve conduction, with results in 30–60 seconds.
Sural Nerve Amplitude (SNAP) & Conduction Velocity — Both Legs
We assess signal strength and speed in both legs to build an objective picture of nerve function.
Clinical Examination
A full hands-on neurological and foot exam — sensation, vibration, reflexes, circulation, and skin — alongside the test result.
Recommended Supporting Tests
Where relevant, blood tests, vascular assessment, or additional nerve testing to check for contributing or reversible causes.
Personalized Treatment Plan
A plan matched to your findings, symptoms, diabetes control, and overall health.
Follow-Up Plan
A structured review schedule, with repeat testing advised where it's likely to change your care.
Who it’s for
Patients with diabetes being assessed for peripheral neuropathy — with or without symptoms — particularly where an objective measurement alongside a clinical exam adds useful information.
Your visit
At your visit, I start with a focused conversation about your diabetes history, current symptoms, and your feet specifically — mild or absent symptoms don't rule out nerve involvement, so I ask about this at diabetes reviews generally, not only when something feels wrong.
If DPN Check testing is appropriate, it's usually done in the same visit alongside your clinical examination, so we get both an objective measurement and a hands-on assessment in one sitting.
- Anyone with type 1, type 2, or gestational diabetes, particularly with diabetes duration beyond a few years
- Patients reporting numbness, tingling, burning, or unexplained foot pain
- Patients with no symptoms at all, as part of a routine diabetes review
- Patients with a prior foot ulcer, foot deformity, or known vascular disease, where objective nerve data adds to risk assessment
The DPN Check test
DPN Check is a small point-of-care device that stimulates and records signals from the sural nerve — a sensory nerve that runs along the outer ankle and lower calf — using surface sensors placed near your ankle and foot.
The device delivers a mild electrical stimulus, which most patients describe as a brief tapping or tingling sensation rather than pain, and measures how the nerve responds. A result is available in 30–60 seconds.
No special preparation is needed. You don't need to fast, and there's no need to stop your usual medications before the test.
Understanding SNAP amplitude and nerve conduction velocity
SNAP stands for Sensory Nerve Action Potential. Its amplitude reflects how many healthy sensory nerve fibers are responding to the test — in simple terms, a stronger signal generally suggests more intact nerve fibers, while a smaller signal can suggest fewer fibers are conducting normally.
Nerve conduction velocity measures how quickly that signal travels along the nerve. Slower conduction can point to changes affecting the nerve's insulating layer, while reduced amplitude more often reflects loss of the nerve fibers themselves — diabetic neuropathy can involve either pattern, sometimes both.
Both legs are tested because diabetic neuropathy typically affects the longest nerves first and tends to progress symmetrically from the feet upward. Testing both sides helps confirm whether a pattern is consistent with diabetic neuropathy, rather than a one-sided problem from an unrelated cause, such as local nerve compression.
Your results are compared against expected reference ranges and are always interpreted alongside your symptoms and clinical exam — never in isolation. Broadly: results within the expected range are reassuring; borderline results may prompt closer monitoring or repeat testing; and results outside the expected range, especially alongside consistent symptoms or exam findings, support a neuropathy diagnosis and shape how actively we manage it.
Clinical examination
Nerve conduction testing complements, and never replaces, a hands-on examination. At each visit where neuropathy is a concern, I assess:
- Sensation, using a monofilament to check protective sensation at standard points on the foot
- Vibration sense, using a tuning fork — often affected early in diabetic neuropathy
- Ankle reflexes, which can diminish or disappear as neuropathy progresses
- Circulation, by checking pulses in the feet and looking for signs of reduced blood flow
- Skin condition, including dryness, calluses, and any breaks in the skin
- Foot shape and structure, looking for deformities that increase pressure points and ulcer risk
- Any existing wounds or ulcers, and signs of infection such as warmth, redness, swelling, or discharge
Recommended supporting tests
Not all neuropathy is caused by diabetes alone, and some contributing causes are reversible or independently manageable. Depending on your history and findings, I may recommend additional testing, including:
- Blood sugar control (HbA1c) — poorly controlled glucose is the single biggest driver of diabetic nerve damage
- Vitamin B12 levels — B12 deficiency causes a nerve-damage pattern that can resemble diabetic neuropathy and is often reversible with supplementation
- Thyroid function — both underactive and overactive thyroid disease can contribute to nerve symptoms
- Kidney function — chronic kidney disease can independently affect nerve health and changes how some medications are dosed
- A review of alcohol use and current medications, both of which can contribute to nerve damage independent of diabetes
- Vascular assessment of blood flow to the legs and feet, since reduced circulation can compound nerve-related foot risk
- Additional or more detailed nerve testing, in select cases, if the pattern of symptoms or findings doesn't fit typical diabetic neuropathy alone
Your personalized treatment plan
If DPN Check testing, examination, or supporting tests point to neuropathy, or confirm a risk that needs closer attention, I put together a treatment plan matched to your specific findings, symptoms, diabetes control, and overall health — there's no single protocol that fits everyone.
It's important to be clear: existing nerve damage is not always fully reversible. What consistent, early management can do is slow further progression, reduce symptoms for many patients, and meaningfully lower the risk of complications such as foot ulcers — which is why acting on results, even mild or borderline ones, is worthwhile.
- Tighter blood sugar management, individualized to your current control and treatment
- Correcting any contributing deficiency or condition identified on testing (for example, B12 replacement or thyroid treatment)
- Nutrition guidance suited to your diabetes management
- A realistic exercise plan, adjusted for your foot-risk level
- Weight management, where relevant
- Smoking cessation support, since smoking accelerates nerve and vascular damage
- Structured foot care guidance to reduce ulcer risk, including footwear advice
- Pain-relief options for neuropathic symptoms, when present, individualized to what you experience and tolerate well
Follow-up plan
Neuropathy care is ongoing rather than a one-time result. Follow-up is built around your risk level and findings: patients with normal results and no symptoms are typically reassessed as part of their regular diabetes review, in keeping with standard diabetes-care guidance; patients with borderline or abnormal results, active symptoms, or additional risk factors are followed more closely, on a schedule set individually.
Repeat DPN Check testing may be advised periodically to track change over time, particularly if your first result was borderline, your symptoms change, or your diabetes control changes significantly — I'll let you know if and when repeat testing makes sense for you, rather than applying a fixed schedule to everyone.
What to expect
A brief, non-invasive test performed in-clinic alongside your full neurological and foot examination — it complements the clinical exam rather than replacing it, with results available in 30–60 seconds and no special preparation needed.
Evidence basis
The manufacturer reports pooled validation data across 30+ studies and 892 patients, with summary sensitivity of approximately 88% and specificity of approximately 82% for detecting peripheral neuropathy (rising to approximately 95% specificity against healthy controls specifically). This is manufacturer-reported meta-analysis data, not an independent third-party finding, and should be read as such. The device is US FDA-cleared; its specific Indian regulatory/import status is still being confirmed and no claim of Indian regulatory approval is made here.
When to seek care
- A new wound, cut, or sore on your foot, especially if it isn't healing
- Redness, warmth, swelling, or drainage from a wound or around a toenail
- Fever alongside any foot wound or skin change
- Sudden weakness or new difficulty walking
- Severe or rapidly worsening pain
- A rapid, noticeable loss of sensation in your feet
FAQ
What is DPN Check nerve conduction testing?
DPN Check is a point-of-care test that measures how well the sural nerve — a sensory nerve in your lower leg and foot — is conducting signals. It gives an objective, in-clinic measurement that complements your symptom history and physical examination when assessing for diabetic peripheral neuropathy.
What does DPN stand for?
DPN stands for diabetic peripheral neuropathy — nerve damage affecting the hands and feet that develops as a complication of diabetes, most often related to prolonged high blood sugar.
Who should have a DPN Check test?
I typically recommend it for patients with diabetes as part of a routine neuropathy assessment, whether or not symptoms are present, and particularly for those with longer diabetes duration, existing foot risk factors, or symptoms such as numbness, tingling, or burning in the feet.
Is the test painful?
No. Most patients feel a brief tapping or tingling sensation from the device's stimulus, not pain. It's a non-invasive, well-tolerated test.
How long does the test take?
The test itself takes about 30 to 60 seconds per leg; with setup, the full assessment as part of your visit takes only a few minutes.
Do I need to fast or stop my medications before the test?
No special preparation is needed. You don't need to fast, and you should continue your usual medications unless I advise otherwise for a specific reason.
What is the sural nerve?
The sural nerve is a sensory nerve that runs along the outer ankle and lower calf. It's commonly used for nerve conduction testing because it's one of the nerves affected earliest in diabetic peripheral neuropathy.
What are SNAP amplitude and nerve conduction velocity?
SNAP (Sensory Nerve Action Potential) amplitude reflects how many healthy sensory nerve fibers are responding to the test stimulus — a lower amplitude can suggest fewer fibers conducting normally. Nerve conduction velocity measures how fast that signal travels along the nerve; slower velocity can suggest changes affecting the nerve's insulating layer. Both are considered together with your clinical picture, not in isolation.
Why are both legs tested?
Diabetic neuropathy typically affects the longest nerves first and tends to progress symmetrically from the feet upward. Testing both legs helps confirm whether findings are consistent with diabetic neuropathy, rather than a one-sided problem from an unrelated cause such as local nerve compression.
Can this test detect neuropathy before symptoms begin?
Yes — that's a key reason we use it. Diabetic peripheral neuropathy can develop silently, with measurable nerve changes appearing before numbness, tingling, or pain are noticeable, which is why testing isn't limited to patients who already have symptoms.
Can neuropathy be reversed?
Existing nerve damage isn't always fully reversible. However, identifying it early and consistently managing contributing factors — particularly blood sugar control — can slow further progression, reduce symptoms for many patients, and lower the risk of complications such as foot ulcers.
What happens if my DPN Check result is abnormal?
An abnormal result is reviewed alongside your symptoms, clinical examination, and other test results to confirm the diagnosis and understand its severity. From there, we discuss a personalized treatment plan addressing your diabetes control, any contributing causes, symptom relief if needed, and foot-care precautions.
Will I need additional tests after DPN Check?
Possibly. Depending on your findings, I may recommend blood tests (such as HbA1c, vitamin B12, thyroid function, or kidney function), a vascular assessment of blood flow to your legs and feet, or, in select cases, more detailed nerve testing.
How often should DPN Check testing be repeated?
This depends on your individual risk and findings rather than a fixed schedule for everyone. Many patients are reassessed as part of their regular diabetes review; those with borderline results, symptoms, or changing diabetes control may be retested sooner, as I advise.
Does diabetic neuropathy increase the risk of foot ulcers or amputation?
Yes. Reduced sensation from neuropathy means an injury or pressure point on the foot can go unnoticed, which is why nerve testing, regular foot examination, and structured foot care are central to reducing this risk.
When should I contact Dr. Ram Kumar urgently?
Contact us promptly if you notice a new foot wound that isn't healing, redness, warmth, swelling, or drainage from a wound, fever alongside a foot problem, sudden weakness, severe or rapidly worsening pain, or a rapid loss of sensation in your feet.
Sources
- DPN Check manufacturer-reported validation data (dpncheck.com)
- American Diabetes Association, Standards of Care in Diabetes—2026
Medical disclaimer: Content on this page is for general education and is not a substitute for individualized medical advice, diagnosis, or treatment. Outcomes vary between patients. Boston Diabetes Center is outpatient / day-care specialty centre with an on-site diagnostic lab and pharmacy — no inpatient beds; imaging and inpatient care are coordinated through partner facilities.