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Diagnosis is relatively easy when all the symptoms of narcolepsy are present, but if the sleep attacks are isolated and cataplexy is mild or absent, diagnosis is more difficult. Three tests that are commonly used in diagnosing narcolepsy are polysomnography (PSG), the multiple sleep latency test (MSLT), and the Epworth Sleepiness Scale (ESS).
The Multiple Sleep Latency Test (MSLT) is a sleep disorder diagnostic tool. It is used to measure the time elapsed from the start of a daytime nap period to the first signs of sleep, called sleep latency. The test is based on the idea that the sleepier people are, the faster they will fall asleep.
Medicare covers sleep tests if you experience clinical signs and symptoms of sleep apnea, narcolepsy, or parasomnia. But there are some limitations depending on what condition is being screened for.
This test measures whether a person can stay awake during a time when she or he is normally awake. [2] [4] Like the MSLT, the MWT is performed in a sleep diagnostic center over 4 - 5 nap periods. A mean sleep onset latency of less than 10 minutes is suggestive of excessive daytime sleepiness.
Presenting with the tetrad of symptoms (excessive daytime sleepiness, sleep-onset paralysis, hypnagogic hallucinations, and cataplexy symptoms) is strong evidence of the diagnosis of narcolepsy. A multiple sleep latency test [clarification needed] is often conducted to quantify daytime sleepiness. [14] Cataplexy can sometimes be misdiagnosed as ...
The test is based on the idea that the sleepier people are, the faster they will fall asleep. [15] [16] The Maintenance of Wakefulness Test (MWT) is also used to quantitatively assess daytime sleepiness. This test is performed in a sleep diagnostic center. The test is similar to the MSLT as it also relies on a measurement of initial sleep latency.
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