Nerve conduction velocity studies (NCV) Home A-Z Health Information Health Library A-Z Nerve Conduction Velocity Studies (NCV) Overview It helps in evaluating conduction in various large peripheral nerves in our body. 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 and its conduction velocity decreases. This is seen in demyelinating disorders. Both motor and sensory component of the nerves are studied using this method. Method Electrodes are placed on the extremities to be studiedThe nerve is then stimulated via a stimulator by giving a low voltage currentAn electrode placed at the other end of the nerve records the response Indications Diagnosis of peripheral neuropathyEvaluation of nerve injuryDiagnosis of nerve compression or entrapment syndromesMonitoring nerve function in chronic diseases such as diabetes and kidney diseasesEvaluation of numbness or weaknessDiagnosis of nerve root lesionsPre-surgical evaluation 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.