Two tests commonly used to diagnose carpal tunnel syndrome are electromyography (EMG) and nerve conduction studies. In electromyography, tiny needles are put into the muscles in your hand to measure the electric activity when your muscles are contracted and when they are at rest. In nerve conduction studies, electrodes pass a current through a particular nerve and the time it takes for the current to reach the muscle is measured. Both tests can show if any nerves or muscles have been damaged.
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