NCV testing measures the speed of conduction of impulses through a nerve. This test is used to diagnose nerve damage and dysfunction. This test can help determine if there is nerve damage, the extent of the damage and if nerves have been destroyed.

Electromyography (EMG) is often performed along with a NCV study which measures your muscles and nerve electrical activity. These tests are used to determine if a person's muscle weakness is nerve damage or some other muscle condition.