Diagnosis of Narcolepsy
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If you have the most classic symptoms of ]]>narcolepsy]]>, such as involuntary sleep attacks and weakness attacks (cataplexy), diagnosis of your disorder may be relatively simple. If your doctor isn’t sure whether your symptoms are caused by narcolepsy, she may order tests, such as:
- ]]>Polysomnogram tests]]>—For this test, you’ll have to spend the night in a sleep center. Tiny electrodes will be attached to various areas of your body in order to closely monitor your heart rate, eye movements, brain waves, and muscle activity throughout the night. Monitors will also record information about your breathing, changes in the concentration of oxygen in your blood, and your body position.
- Multiple sleep latency test—This test is usually done the day after the polysomnogram. With the same set of electrodes still attached, you’ll be asked to take a series of 20-minute naps, every 2 hours throughout the day. The electrodes collect information about how quickly you fall asleep and how quickly you reach various levels of sleep—particularly rapid eye movement (REM) sleep.
- Genetic blood tests—Narcolepsy is linked to a particular antigen, a substance that triggers your body to make antibodies. Your doctor may test your blood to discover if you have this antigen.
Goetz CG, Pappert EJ. Textbook of Clinical Neurology. Philadelphia, PA: WB Saunders Company; 1999.
HLA test menu. Quest Diagnostics website. Available at: http://www.questdiagnostics.com. Accessed February 11, 2009.
Narcolepsy. National Heart, Lung, and Blood Institute. National Institutes of Health website. Available at: http://www.nhlbi.nih.gov/health/dci/Diseases/nar/nar_what.html. Updated November 2008. Accessed April 7, 2009.
Last reviewed February 2009 by ]]> Rimas Lukas, MD]]>
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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