A nerve conduction study (NCS) is a medical diagnostic test measures how fast an electrical impulse
moves through your nerve.
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During the test, your nerve is stimulated, usually with electrode patches attached to your skin. Two
electrodes are placed on the skin over your nerve. One electrode stimulates your nerve with a very
mild electrical impulse, the other electrode records it. The resulting electrical activity is
recorded by another electrode. This is repeated for each nerve being tested.
These tests may be performed by medical specialists such as clinical neurophysiologists, physical
therapists, chiropractors, physiatrists (physical medicine and rehabilitation physicians), and
neurologists who subspecialize in electrodiagnostic medicine.
Why does a person need a nerve conduction study test?
NCS is often used along with an EMG to tell the difference between a nerve disorder and a muscle
disorder. NCS detects a problem with the nerve.
Diseases or conditions that may be checked with NCS include:
Guillain-Barré syndrome
Carpal tunnel syndrome
Charcot-Marie-Tooth disease
Herniated disk disease
Chronic inflammatory polyneuropathy and neuropathy
Sciatic nerve problems
Nerve conduction studies may also be done to find the cause of symptoms, such as numbness,
tingling, and continuous pain.
