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Sleep Tests

Type I, II, III, or IV.Based laboratory (Type I study) or a home sleep test (HST) (Types II, III, or IV).

Facility-based sleep test

A Type I sleep test is the continuous and simultaneous monitoring and recording of various physiological and pathophysiological parameters of sleep with physician review, interpretation, and report. It is facility-based and or must include sleep staging, which is defined to include a 1-4 lead electroencephalogram (EEG), electrooculogram (EOG), submental electromyogram (EMG) and electrocardiogram (ECG). It must also include at least the following additional parameters of sleep:

• Airflow
• Respiratory effort
• Oxygen saturation by oximetry
• Performed as either a whole night study for diagnosis only or a split night study to diagnose and initially evaluate treatment

Home Sleep Test (HST)

A HST is performed unattended in the beneficiary’s home using a portable monitoring device.A portable monitoring device for conducting an HST must meet one of the following criteria, if qualifying a Medicare patient for PAP therapy:

Type II device

Monitors and records a minimum of 7 channels: EEG, EOG, EMG, ECG/heart rate, air flow, respiratory movement/ effort and oxygen saturation.

Type III device

Monitors and records a minimum of 4 channels: respiratory movement/effort, airflow, ECG/heart rate and oxygen saturation

Type IV device

Monitors and records a minimum of 3 channels that allow direct calculation of an AHI or RDI as the result of measuring airflow or thorocoabdominal movement.

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