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Nerve Conduction Velocity (NCV) Studies

Overview

Nerve conduction velocity (NCV) studies are non-invasive tests that measure how well and how fast the peripheral nerves in our body send electrical signals. The latency, amplitude, and conduction velocity are calculated for the nerve under investigation. A decrease in recorded amplitude implies damage to the axons of the nerve (axonal neuropathy). If the myelin sheath surrounding the nerve gets affected, the nerve conducts the electrical impulse slowly, which is seen in demyelinating disorders. Both motor and sensory components of the nerves are studied using this method.

  • Peripheral neuropathy (nerve damage causing numbness or weakness)
  • Nerve injury
  • Nerve compression or entrapment syndromes (e.g., carpal tunnel syndrome)
  • Nerve function in chronic diseases such as diabetes and kidney diseases
  • Evaluation of numbness or weakness
  • Diagnosis of nerve root lesions (problems at the point where nerves exit the spine)
  • Pre-surgical evaluation of nerve function

The following steps are involved:

  • Electrodes are placed on the arms or legs over the nerve to be studied.
  • The nerve is then stimulated via a stimulator by giving a low voltage current.
  • An electrode placed at the other end of the nerve records the response.
  • The machine then calculates the speed, strength, and timing of nerve signals.

The test usually takes about 30–60 minutes, depending on the number of nerves studied.

No recovery time is needed. Patients can return to normal activities immediately after the test.

Disclaimer:

The information in this Health Library is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional with any questions about a medical condition or before starting any treatment. Use of this site and its content does not establish a doctor–patient relationship. In case of a medical emergency, call your local emergency number or visit the nearest emergency facility immediately.