Somatosensory evoked potential (SSEP) tests evaluate the nerve pathway from the peripheral nerve through the spine to the somatosensory region of the brain. ("Somato" means body; "sensory" means the reception and transmission of sense impressions.) SSEP tests are useful in evaluating spinal cord injuries or disease, neuromuscular disease, and demyelinating diseases such as multiple sclerosis.

During an SSEP test, electrodes are attached to the scalp and at various points along the nerve pathway from an arm or leg to the brain. A small electrical current is applied to the skin overlying a nerve or nerves on the arm or leg. The electrodes record hundreds, sometimes thousands, of electrical responses from the patient's nerve pathway, and these responses are recorded by a special computer for interpretation by a physician.

Southern Utah Neurological and Neurodiagnostics requests the following of patients to ensure that quality BAEP results can be obtained:

• Ensure that your hair is clean and dry, and do not use any hair gels, dressings, or hairspray before the test. Dirty hair or scalp can interfere with electrode sensitivity.
• Eat your normal meals and take your regular medications, unless otherwise instructed by your physician.
• Wear loose-fitting clothing, as electrodes will be applied to your legs, neck, back, hips, and/or knees.
• If you have been told that you will receive a sedative to help you relax and stay still, arrange to have someone drive you home.

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