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SEP or Somatosensory Evoked Potential is a diagnostic test that evaluates the neuro pathways between the peripheral and central nervous system.
The test is usually performed to evaluate multiple sclerosis, peripheral neuropathy and problems with decreased strength or sensation. SEP testing can be done on the arms or the legs.
Sometimes physicians will order SEP testing on all limbs. SEPs on the arms and legs each require approximately 90 minutes for testing.
| How is an SEP recorded? |
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Before the test, a technologist will obtain a thorough history. The patient’s head will be measured and marked for the four electrodes that are applied to the scalp.
For SEP testing on the legs, electrodes will be applied to the back, the hip, the back of the knees, the ankles and the calves. For SEP testing on the arms, electrodes will be also be applied to the collar bones, the back of the neck, the wrists and the forearms.
In most cases, the electrodes are applied with a special tape that is easily removed when the test is finished.
During the test, a weak electrical current is delivered to the wrists or ankles.
When the test has been completed, the patient’s scalp is cleaned. |
| Preparing for the SEP |
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SEP data is easier to interpret if the patient being tested is very relaxed, preferably asleep. For this reason, patients are frequently asked to sleep less on the night prior to their test. |
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Patients should restrict their consumption of caffeine products such as coffee, tea, soda and chocolate. |
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Patients should continue taking their medication as normal. |
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Please bring a list of current medications. |
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Fasting is not required for an SEP, in fact, eating a meal or a snack prior to the test is advised. |
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Do not consume alcohol 12 hours before testing. |
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Bring loose and comfortable clothing. Shorts or sweat pants are fine. |
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Make sure your hair is clean and dry. Do not wear makeup, hair spray, gels or earrings. |
| Common Misconceptions |
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Many patients confuse the SEP with the EMG (electromyogram). The SEP, however, does not involve needles that deliver shocks into the muscles.
There is no shaving or hair cutting with an SEP. Patients are allowed to have their family members in the room during the test. No small children please. |
| Test Results |
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A neurologist will interpret the SEP and results will be made available to your primary care physician within seven to ten business days. |
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Neurodiagnostic Lab
PHONE: (503) 561-5268 |
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