The most common way in which Sleep Apnea is diagnosed is by a sleep recording using a polysomnogram or PSG. This test is painless and is done in a sleep laboratory or a sleep center. PSG testing notes the activity of the brain, eye movement, muscle activity, breathing and heart rate, amount of air taken in and expelled from the lungs while asleep, and the percent of the amount of oxygen in the bloodstream. this test not only disgnoses Sleep Apnea, but it also measures the severity of it.
The MSLT (Multiple Sleep Latency Test) measures how fast a person falls asleep. In this test the patient is permitted to fall asleep during the day whenever they feel sleepy. During each time of sleep, the time it tollk to actually fall asleep is measured and recorded. people who take less than 5 minutes to fall asleep usually require treatment for sleep disorders. The MSLT is used to measure daytime sleepiness.