The NCV test, also known as a Nerve Conduction Study (NCS), is a diagnostic procedure that measures the speed and strength of electrical signals traveling through your nerves.

• It is often performed alongside Electromyography (EMG) to check both nerve and muscle health.
• The test helps identify nerve damage or dysfunction.

Nerves act like “electrical wires” of the body, carrying signals from the brain to muscles and skin. When nerves are damaged, these signals slow down or weaken.

Doctors recommend NCV tests for conditions such as:

• Peripheral neuropathy (common in diabetes)
• Carpal tunnel syndrome
• Herniated discs or sciatica
• Guillain-Barré syndrome
• Nerve injuries from accidents
• Muscle weakness or unexplained tingling/numbness

The test is straightforward and usually takes 30–60 minutes.

Step-by-step procedure:

1. Electrodes are placed on the skin over the nerve being tested.
2. A mild electrical impulse is delivered to stimulate the nerve.
3. The response is recorded by another electrode.
4. The machine measures how fast and strong the nerve signal travels.

👉 The test is not painful, but you may feel a quick tingling or tapping sensation when the nerve is stimulated.

The results are measured in terms of conduction velocity (speed) and amplitude (strength).

• Normal nerve conduction: 50–60 meters per second (varies by age, temperature, and nerve type).
• Slower signals: May indicate nerve damage or demyelination (loss of nerve covering).
• Weaker signals: May suggest axonal damage (nerve fiber injury).

Your doctor will compare the results with standard values to determine the condition.