Procedure
Overview
Nerve Conduction Velocity (NCV)
Nerve conduction velocity (NCV) test is a measurement of the
speed of conduction of an electrical impulse through a nerve. NCV
can determine nerve damage and destruction.
During the test, the nerve is stimulated, usually with surface
electrode patches attached to the skin. Two electrodes are placed on
the skin over the nerve. One electrode stimulates the nerve with a
very mild electrical impulse and the other electrode records it. The
resulting electrical activity is recorded by another electrode. This
is repeated for each nerve being tested.
The nerve conduction velocity (speed) is then calculated by
measuring the distance between electrodes and the time it takes for
electrical impulses to travel between electrodes.
A related procedure that may be performed is electromyography (EMG).
An EMG measures the electrical activity in muscles and is often
performed at the same time as NCV. Both procedures help to detect
the presence, location, and extent of diseases that damage the
nerves and muscles. Please see this procedure for additional
information.
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