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An electromyogram (EMG) measures the electrical activity of muscles at rest and during contraction. Nerve conduction studies measure how well and how fast the nerves can send electrical signals.  Nerves control the muscles in the body with electrical signals called impulses. These impulses make the muscles react in specific ways. Nerve and muscle problems cause the muscles to react in abnormal ways. 


EMG and nerve conduction studies are an extension of the physical examination. They can be useful in aiding in the diagnosis of peripheral nerve and muscle problems. This can include peripheral neuropathies, entrapment neuropathies, radiculopathies, and muscle disorders.


If you have hand, arm and leg pain or numbness, you may have these tests to find out how much your nerves are being affected. These tests check how well your spinal nerves and the nerves in your arms and legs are working.

Common indications for EMG/NCS:

  • Hand numbness

  • Foot numbness

  • Arm pain or numbness

  • Leg pain or numbness

  • Arm and leg weakness

  • Radicular pain

  • Polyneuropathy

  • Carpal tunnel syndrome

  • Ulnar neuropathy

  • Peripheral Neuropathy

  • Brachial Plexopathy

  • Radiculopathy

  • Myasthenia Gravis

  • Muscle Disease

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