A Nerve Conduction Velocity (NCV) test measures how fast and how strongly electrical signals travel along your nerves. Small surface electrodes stimulate the nerve with mild electric pulses. It is often combined with EMG (electromyography), which records muscle activity.
Why it is done
- Numbness, tingling or burning in hands or feet
- Carpal tunnel syndrome
- Diabetic and other peripheral neuropathies
- Weakness of limbs, foot drop, nerve injuries
- Radiculopathy / sciatica, Guillain-Barré syndrome
Preparation
- Bathe and do not apply oil, cream or lotion on the day of the test.
- Wear loose clothing so arms and legs can be exposed.
- Continue your regular medicines unless told otherwise.
Frequently asked questions about NCV / EMG
Is the NCV test painful?
You feel brief tingling or tapping sensations from the electrical pulses. It is uncomfortable for some people but well tolerated.
How long does NCV take?
Usually 30–60 minutes depending on how many nerves are tested.
Page reviewed by the radiology team at Kansal Diagnostic Centre · Updated October 2026