Quantitative sensory testing

Overview

Quantitative sensory testing (QST) is a set of painless tests that measure how well your nerves sense different sensations like touch, temperature, vibration, and pain. It helps doctors find out if you have nerve damage and how severe it is.

Quantitative sensory testing is a specialized test, not a routine check-up. It is most often used when a person has symptoms of nerve damage that are not clear from a standard physical exam.

QST is used for people of any age who have symptoms such as numbness, tingling, burning pain, or loss of sensation. It is often used in people with diabetes, chronic pain conditions, or after a stroke.

Symptoms

Common symptoms

• Numbness or reduced feeling in hands or feet
• Tingling or pins-and-needles sensations
• Burning or stabbing pain
• Sensitivity to touch or temperature changes
• Weakness in muscles

Symptoms in children

• Children may not complain of symptoms directly; look for clumsiness, avoiding certain textures or temperatures, or complaints of pain that seems unexplained.

Symptoms in older adults

• Older adults may experience numbness or pain in the feet or hands that interferes with walking or daily activities.
• They may also have reduced ability to feel heat or cold, increasing risk of burns or injuries.

Causes

Main causes

• Nerve compression or injury (e.g., carpal tunnel syndrome, herniated disc)
• Diabetes (diabetic neuropathy)
• Vitamin deficiencies (e.g., B12 deficiency)
• Autoimmune diseases (e.g., lupus, rheumatoid arthritis)
• Alcohol misuse or exposure to toxins
• Infections (e.g., shingles, Lyme disease)

Risk factors

• Long-term diabetes with poor blood sugar control
• Family history of nerve disorders
• Repetitive motions or prolonged pressure on a nerve
• Heavy alcohol use
• Certain chemotherapy drugs (talk to your doctor about any risks)

When to see a doctor

See a doctor urgently if:

• If you have sudden loss of sensation in a limb or face
• If you have pain or numbness that comes with headache, dizziness, or confusion

Book a routine appointment if:

• If you have persistent tingling, numbness, or pain in your hands or feet
• If you have diabetes and notice changes in sensation in your feet
• If you have weakness that does not go away

Diagnosis

Quantitative sensory testing is done by a neurologist or a trained specialist. It involves using devices to apply specific stimuli (like vibration, cool temperature, or gentle pressure) to different body parts. You simply respond when you feel the sensation. The results are compared to normal values for your age.

Tests that may be done

• Vibration testing using a tuning fork or a device that measures vibration perception
• Temperature testing with a small probe that is cooled or warmed
• Pressure or touch testing with fine filaments or pins
• Pain sensitivity testing with a sharp object (often done carefully)

What to expect at your appointment

The test is painless, though you may feel mild discomfort from heat/cold or light pricks. It usually takes about 30–60 minutes. You will be asked to relax and report when you feel sensations. There are no needles or injections. Your doctor will explain the results after the test.

Treatment

Quantitative sensory testing itself does not treat nerve problems. Instead, it helps your doctor decide which treatment is best suited for the type of nerve damage you have. Treatment may include medications, physical therapy, lifestyle changes, or managing underlying conditions like diabetes.

Self-care at home

• Maintain good blood sugar control if you have diabetes
• Protect your feet: wear well-fitting shoes, check for cuts or sores daily
• Avoid alcohol and smoking, which can worsen nerve damage
• If you have numbness, be careful with hot water or heating pads to avoid burns

Medical treatments

Treatment depends on the cause of nerve damage. Doctors may prescribe medications to reduce nerve pain (such as certain antidepressants or anticonvulsants), recommend physical or occupational therapy to improve strength and coordination, or suggest vitamin supplements if deficiencies are found. Always follow your doctor's advice and do not take any medication without their guidance.

When is surgery considered?

When a nerve is compressed (like in carpal tunnel syndrome or a herniated disc), surgery to relieve pressure may be considered if other treatments do not help.

Living with this condition

Living with nerve symptoms can be challenging, but many people manage well with the right support. Keep a symptom diary to help your doctor track changes. Use safety measures at home, like grab bars in the bathroom and good lighting to prevent falls.

Lifestyle tips

• Stay active with gentle exercises like walking or swimming, as recommended by your doctor
• Practice good foot care – inspect your feet daily
• Manage stress with relaxation techniques, meditation, or hobbies
• Get adequate sleep – nerve pain can disrupt sleep, so talk to your doctor if you need help

Diet and exercise

Eat a balanced diet rich in fruits, vegetables, whole grains, lean protein, and healthy fats. If you have diabetes, work with a dietitian to keep blood sugar stable. Exercise improves blood flow and can reduce nerve pain – start slowly and increase gradually.

Mental health and emotional wellbeing

Chronic pain or numbness can be frustrating and may lead to anxiety or depression. It is okay to feel this way. Talk to your doctor about your feelings – they can refer you to a counsellor or support group. You are not alone.

Prevention

Not all nerve damage can be prevented, but you can lower your risk. Keep chronic conditions like diabetes and high blood pressure under control. Eat a healthy diet, exercise regularly, and avoid excessive alcohol. Protect your nerves from injury by using proper ergonomics at work and during sports.

Vaccines

Vaccines do not prevent most causes of nerve damage, but staying up to date with vaccines (like shingles vaccine) can help prevent some viral infections that may cause nerve problems.

Screening programmes

If you have diabetes, research suggests you should have an annual foot exam to check sensation. Talk to your doctor about whether regular QST or other nerve tests are right for you.

Complications

If left untreated

• Permanent loss of sensation or muscle weakness
• Difficulty walking or increased risk of falls and injuries
• Foot ulcers and infections that can lead to amputation (especially in diabetes)
• Chronic pain that affects quality of life

Long-term outlook

With early diagnosis and proper management, many people with nerve damage can stabilize their symptoms and maintain good quality of life. QST helps guide treatment, which can slow progression and relieve pain. Your healthcare team is there to support you every step of the way.

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