The Somatosensory Evoked Potential (SSEP) (a.k.a. somatosensory evoked response (SSER)) may be performed on nerves of either the upper or lower extremities. The peripheral nerves are stimulated, and responses are recorded from the peripheral nerve, spinal cord and central nervous system as the signal travels up the limb, the spine and ultimately reaching the brain.

First, electrodes are placed over certain parts of the body. Electrodes may be placed on the scalp, cervical spine, collarbone area, lower spine, and knee area. The number of electrodes applied is dependent on the type of study being performed.

Then, the technician will take a few measurements of the scalp. Next, the technician will apply gel that will allow the electrodes to connect effectively. The technician will ensure you are comfortable before beginning the examination. Note: It is very important to lie quietly with your eyes closed in a relaxed state as this helps the procedure go more quickly.

Once the electrodes have been connected to the device, you will start to feel a mild electrical pulsing sensation at your wrist or ankle (depending on which nerve is being tested). This electric pulse will increase little by little until it produces a small motor twitch. During the period of examination, several thousand repetitions may occur, and the stimulations must be replicated to ensure accurate results.

At the completion of the study, the electrodes will be removed, and the paste will be wiped away from the electrode sites with a damp washcloth. If the electrodes were on your scalp, the technician will comb through your hair to remove any remaining paste. There should not be any obvious remaining paste, but if there is, you will need to wash it off when you can remove any sticky residue.

The study will be interpreted by one of our physicians and a report will be given to your doctor. Your physician or provider will contact you with the results. After the test is completed, you are free to resume normal activities.

The sensation of an electric pulse inducing motor movements may feel strange, and you may find it annoying or uncomfortable. However, this test is typically not a painful one.

The length of time that the test takes ultimately is dependent upon your ability to relax and lay still.

Normally, it can take up to 20 minutes for each limb to be sufficiently tested.

If you are having all four limbs tested, then your testing time may last up to 3 hours.