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:
• 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.