CPT® Code 95805

Multiple sleep latency or maintenance of wakefulness testing, recording, analysis and interpretation of physiological measurements of sleep during multiple trials to assess sleepiness

A multiple sleep latency test (MSLT) or maintenance of wakefulness test is a specialized procedure designed to evaluate the presence and severity of daytime sleepiness, as well as to identify sleep abnormalities that may be associated with conditions such as narcolepsy. This test is typically conducted in a sleep study center, where the patient arrives in the morning after having completed a normal nighttime sleep period, usually about two hours prior to the start of the test. The procedure involves the attachment of various electrodes to the patient's body to monitor and record physiological measurements during multiple trials. These measurements include brain activity through electroencephalography (EEG), heart rate via electrocardiogram (ECG) electrodes, and muscle and eye movement through additional electrodes placed around the eyes and under the chin. Furthermore, an oxygen probe is affixed to the patient's finger to assess blood oxygen saturation, while airflow measurement devices are positioned at the nose and mouth to monitor respiratory function. The MSLT consists of a series of timed naps taken at two-hour intervals, interspersed with periods of wakefulness, during which the patient is observed by a sleep technologist through closed-circuit television. The environment is controlled, with the room darkened during nap periods to facilitate sleep. Throughout the test, the patient's ability to maintain wakefulness is assessed, and the collected data is meticulously analyzed by the physician, who then provides a comprehensive written interpretation of the physiological measurements obtained during the testing period.