Skip to content
How It Works
Explore
Ask a Question Resources Pricing
Who It's For
Patients
Decode results, prep for appointments, weigh options.
Caregivers & advocates
Carry the research load for someone you love.
Providers & clinicians
Resources for patients in your practice.
Log In Ask a Question
PubMed This is a summary of 20 peer-reviewed journal articles Updated
Neurology

Diagnosis and Monitoring: The Road to Prevention

At a Glance

Diabetic neuropathy is usually diagnosed through symptoms and a foot exam rather than one lab test. Regular screening, sensation and blood-flow checks, and risk-based follow-up can identify loss of protective sensation and help prevent foot ulcers.

Diagnosing diabetic neuropathy is a clinical process, meaning it relies heavily on your symptoms, medical history, and a bedside physical examination rather than a single lab test. Because you may have nerve damage without even knowing it, regular screening is the most important tool you have for preventing complications [1][2].

When Should Screening Start?

The timing for your first formal neuropathy screen depends on the type of diabetes you have [1][3]:

  • Type 2 Diabetes: You should be screened at the time of your diagnosis and then at least once every year after that. This is because high blood sugar may have been present for years before you were diagnosed [1][2].
  • Type 1 Diabetes: Screening should begin five years after your diagnosis and then continue annually [1].

Note: Your feet should also be looked at during routine diabetes visits, not only during the annual exam.

The Bedside Exam: More Than Just a Poke

Your doctor will perform several simple tests to check different types of nerve fibers. Diagnosis is clinical, and different tests answer different questions [4][5].

The 10-g Monofilament Test

The doctor uses a small plastic thread (monofilament) to press against specific points on your foot. It should be just firm enough to bend the thread.

  • What it tells us: This test specifically checks for Loss of Protective Sensation (LOPS)—meaning you cannot feel enough pressure to protect your foot from injury [6].
  • The limitation: It is primarily for assessing ulcer risk, not for detecting every form of neuropathy. It can be normal even if you have painful early neuropathy [7][8].

Vibration Testing (Tuning Fork)

A vibrating metal tuning fork is placed against the bony part of your big toe.

  • What it tells us: This tests your “large-fiber” nerves, which carry position and vibration signals [9][10].

Pinprick and Temperature

The doctor may use a specialized tool to see if you can feel a sharp sensation or distinguish between hot and cold.

  • What it tells us: These tests check your “small-fiber” nerves, which carry pain and temperature signals [11][8].

Ankle Reflexes

The doctor taps your Achilles tendon with a small hammer. A reduced or absent reflex can be a clinical sign of nerve involvement [4][12].

When Specialized Tests are Needed

In most cases, typical diabetic peripheral neuropathy is diagnosed clinically. Nerve studies and skin biopsies are specialist-directed tests for atypical or unclear cases:

  • Nerve Conduction Studies (NCS/EMG): These tests use small electrical shocks to measure how fast and strong the signals are traveling through your nerves [13].
  • Skin Biopsy: A tiny “punch” of skin is taken and looked at under a microscope to count the nerve endings [14]. This is a validated objective test for measuring small-fiber damage [15][16].

Your Foot Risk and Follow-Up Schedule

Based on your exam, your doctor will assign a risk category. While local guidelines determine the exact schedule, common follow-up intervals include [17][18]:

Risk Category What it Means Typical Follow-Up
Low Risk Normal sensation, good pulses, no deformities. Annually
Moderate Risk Loss of protective sensation OR poor circulation (Peripheral Artery Disease) OR deformity. Every 3 to 6 months
High Risk History of foot ulcer, amputation, or multiple risk factors combined. Every 1 to 3 months

Your Annual Foot Exam Checklist

Every person with diabetes should have a comprehensive foot exam at least once a year. Use this checklist [19][5][20]:

  • [ ] Visual Inspection: Checking for calluses, dry skin, thick nails, or changes in foot shape.
  • [ ] Sensation Tests: Using at least two different methods (e.g., monofilament AND a tuning fork).
  • [ ] Vascular Check: Feeling the pulses on the top of your foot and behind your ankle to check blood flow.
  • [ ] Footwear Review: Looking at your shoes to ensure they aren’t causing pressure points.
  • [ ] Risk Score: Discuss your risk category and follow-up schedule.

Common questions in this guide

When should I have my first screening for diabetic neuropathy?
For type 2 diabetes, screening should begin when diabetes is diagnosed and be repeated at least yearly. For type 1 diabetes, it usually starts five years after diagnosis and continues annually; your feet should also be checked during routine diabetes visits.
Can a normal 10-g monofilament test rule out diabetic neuropathy?
No. The monofilament test mainly checks whether you have lost enough protective sensation to increase your risk of foot injury or ulcers, and it can be normal when painful early nerve damage is present.
What happens during a comprehensive diabetic foot exam?
A clinician may inspect your skin, nails, calluses, and foot shape; test sensation with methods such as a monofilament or tuning fork; and check your foot pulses. The exam may also include a review of your footwear and an assessment of your follow-up risk category.
How often will I need follow-up after my foot risk is assessed?
People at low risk are commonly followed annually, those at moderate risk every three to six months, and those at high risk every one to three months. The exact schedule depends on local guidance and your individual findings, including sensation, circulation, deformities, and any history of ulcers or amputation.
What tests can check diabetic nerve damage if I have burning pain but normal sensation on screening?
Pinprick and temperature testing can assess small nerve fibers that may not be detected by a monofilament test. When the diagnosis is unclear or unusual, a specialist may consider nerve conduction studies with or without EMG, or a small skin biopsy to measure nerve endings.
What does loss of protective sensation mean for my feet?
Loss of protective sensation means you may not feel enough pressure or injury to protect your foot. It increases the risk of unnoticed wounds and ulcers, so your clinician may recommend closer monitoring and extra foot-care precautions.
Why are my foot pulses checked, and when might I need an ABI test?
Foot pulses provide information about blood flow, and weak pulses may suggest peripheral artery disease or a higher foot-risk category. If circulation is concerning, your clinician may consider additional vascular testing such as an ankle-brachial index, or ABI.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Based on my foot exam results, am I considered low, moderate, or high risk for ulcers, and what is our plan for my next follow-up?
  2. 2.Do I currently have 'Loss of Protective Sensation' (LOPS), and how does that change how often I need to see you or a podiatrist?
  3. 3.Since my monofilament test was normal but I still have burning pain, what other tests can we do to check my small nerve fibers?
  4. 4.Are my pedal pulses strong enough, or do I need further vascular testing like an ankle-brachial index (ABI)?
  5. 5.When is a referral to podiatry, vascular surgery, neurology, or physical therapy typically considered for someone in my situation?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (20)
  1. 1

    Diabetic distal symmetric polyneuropathy: More than just "tingling in the feet".

    Bell DSH, Jerkins TW

    Diabetes, obesity & metabolism 2026; (28(2)):817-825 doi:10.1111/dom.70235.

    PMID: 41198580
  2. 2

    Effectiveness of Current Diagnostic Methods in the Early Detection of Diabetic Peripheral Neuropathy: Are We Missing the Window?

    Liaqat A

    Cureus 2026; (18(4)):e106429 doi:10.7759/cureus.106429.

    PMID: 42088795
  3. 3

    Peripheral Neuropathy in Diabetes Mellitus: Pathogenetic Mechanisms and Diagnostic Options.

    Galiero R, Caturano A, Vetrano E, et al.

    International journal of molecular sciences 2023; (24(4)) doi:10.3390/ijms24043554.

    PMID: 36834971
  4. 4

    SENSITIVITY OF FOUR SIMPLE METHODS TO SCREEN CHINESE PATIENTS FOR DIABETIC PERIPHERAL NEUROPATHY.

    Jie FY, Zafar MI, Xu L, et al.

    Acta endocrinologica (Bucharest, Romania : 2005) 2018; (14(3)):410-415 doi:10.4183/aeb.2018.410.

    PMID: 31149292
  5. 5

    Diabetic Foot Screening: A Systematic Review of Global Guidelines and Questionnaire-Based Tools.

    Quak GSW, Lin JHX, Liew H, et al.

    The international journal of lower extremity wounds 2025; 15347346251381091 doi:10.1177/15347346251381091.

    PMID: 41021788
  6. 6

    One-stop microvascular screening service: an effective model for the early detection of diabetic peripheral neuropathy and the high-risk foot.

    Binns-Hall O, Selvarajah D, Sanger D, et al.

    Diabetic medicine : a journal of the British Diabetic Association 2018; (35(7)):887-894 doi:10.1111/dme.13630.

    PMID: 29608799
  7. 7

    Diagnostic Accuracy of Monofilament Tests for Detecting Diabetic Peripheral Neuropathy: A Systematic Review and Meta-Analysis.

    Wang F, Zhang J, Yu J, et al.

    Journal of diabetes research 2017; (2017()):8787261 doi:10.1155/2017/8787261.

    PMID: 29119118
  8. 8

    Diabetic neuropathy: A focus on small fibres.

    Malik RA

    Diabetes/metabolism research and reviews 2020; (36 Suppl 1()):e3255 doi:10.1002/dmrr.3255.

    PMID: 31828951
  9. 9

    Diagnostic Accuracy of Screening Tests for Diabetic Peripheral Neuropathy: An Umbrella Review.

    Mogilevskaya M, Gaviria-Carrillo M, Feliciano-Alfonso JE, et al.

    Journal of diabetes research 2024; (2024()):5902036 doi:10.1155/jdr/5902036.

    PMID: 39664106
  10. 10

    Can the 128-Hz tuning fork be an alternative to the biothesiometer for diabetic peripheral neuropathy screening? A cross-sectional study in a tertiary hospital in East India.

    Chattopadhyay S, Goswami S, Sengupta N, Baidya A

    BMJ open 2024; (14(6)):e082193 doi:10.1136/bmjopen-2023-082193.

    PMID: 38862223
  11. 11

    Clinical Tools for Peripheral Neuropathy to Exclude Cardiovascular Autonomic Neuropathy in Type 2 Diabetes Mellitus.

    Pafili K, Trypsianis G, Papazoglou D, et al.

    Diabetes therapy : research, treatment and education of diabetes and related disorders 2020; (11(4)):979-986 doi:10.1007/s13300-020-00795-0.

    PMID: 32172390
  12. 12

    Microvascular complications and prevalence of urgency incontinence in Japanese patients with type 2 diabetes mellitus: The dogo study.

    Furukawa S, Sakai T, Niiya T, et al.

    Neurourology and urodynamics 2016; (35(8)):1024-1027 doi:10.1002/nau.22875.

    PMID: 26352009
  13. 13

    A Clinician's Approach to Peripheral Neuropathy.

    Siao P, Kaku M

    Seminars in neurology 2019; (39(5)):519-530 doi:10.1055/s-0039-1694747.

    PMID: 31639835
  14. 14

    Intraepidermal Nerve Fiber Density as Measured by Skin Punch Biopsy as a Marker for Small Fiber Neuropathy: Application in Patients with Fibromyalgia.

    Kelley MA, Hackshaw KV

    Diagnostics (Basel, Switzerland) 2021; (11(3)) doi:10.3390/diagnostics11030536.

    PMID: 33802768
  15. 15

    Early Diagnosis of Diabetic Neuropathy: A Review of Current Diagnostic Tests.

    Al-Khafaji M, Otti V

    Cureus 2025; (17(11)):e97880 doi:10.7759/cureus.97880.

    PMID: 41458830
  16. 16

    Clinical diagnosis and management of small fiber neuropathy: an update on best practice.

    Devigili G, Cazzato D, Lauria G

    Expert review of neurotherapeutics 2020; (20(9)):967-980 doi:10.1080/14737175.2020.1794825.

    PMID: 32654574
  17. 17

    Guidelines on the prevention of foot ulcers in persons with diabetes (IWGDF 2023 update).

    Bus SA, Sacco ICN, Monteiro-Soares M, et al.

    Diabetes/metabolism research and reviews 2024; (40(3)):e3651 doi:10.1002/dmrr.3651.

    PMID: 37302121
  18. 18

    Preventing diabetes-related foot ulcers through early detection of peripheral neuropathy.

    McMorrow R, Nube VL, Manski-Nankervis JA

    Australian journal of general practice 2022; (51(11)):833-838 doi:10.31128/AJGP-06-22-6456.

    PMID: 36309996
  19. 19

    The Diabetic Foot Assessment.

    Johnson R, Osbourne A, Rispoli J, Verdin C

    Orthopedic nursing 2018; (37(1)):13-21 doi:10.1097/NOR.0000000000000414.

    PMID: 29369130
  20. 20

    Temporal trends of selected diabetic foot deformities and risk factors: an exploratory analysis from a tertiary diabetes clinic.

    Štotl I, Blagus R, Urbančič-Rovan V

    Diabetes research and clinical practice 2026; (237()):113299 doi:10.1016/j.diabres.2026.113299.

    PMID: 42103114

This page is for informational purposes only and does not constitute medical advice. It explains diabetic neuropathy screening and foot-risk monitoring; your healthcare professional should interpret your results and recommend follow-up.

Get notified when new evidence is published on diabetic neuropathy.

We monitor PubMed for new peer-reviewed studies on this topic and email a short summary when something meaningful changes.