Electrodiagnostic testing encompasses a range of specialized tests, including nerve conduction studies (NCS) and needle electromyography (EMG), that are used to evaluate the conduction of electrical impulses down peripheral nerves. These tests should be considered and performed only after a careful history and physical examination, which are sometimes sufficient to establish a diagnosis of neuromuscular dysfunction without further testing. However, in some cases, the subtlety of sensory or motor deficits necessitates further workup for a conclusive diagnosis. : Nerve conduction studies and needle EMG are commonly performed by physical medicine and rehabilitation or neurology specialists to assess the ability of the nervous system to conduct electrical impulses and to evaluate nerve/muscle function to determine if neuromuscular disease is present.
An electromyogram (EMG) measures the electrical activity of muscles when they are at rest and when they are being used. Nerve conduction studies measure how effectively and at what speed the nerves can send electrical signals.
The nerves control the muscles of the body with electrical signals called impulses. These impulses react the muscles in certain ways. Nervous and muscular problems cause the muscles to react in ways that are not normal.
If you have pain or numbness in your leg, you could do these tests to find out which nerves are being affected and to what extent they are affected. These tests verify how well your spinal nerves work. They also check the nerves in your arms and legs