Type 1 device (Attended polysomnography) | Type 2 device (Unattended polysomnography) | Type 3 device (Portable HSAT) | Type 4 device (Single or dual bioparameter recording) | ||
Example of a type 3 device* | |||||
Minimal measurements |
|
| Minimum 4 parameters, typically:
| PAT, oximetry, heart rate, snoring actigraphy, body position | Only 1 or 2 variables measured (typically oxygen saturation, airflow, chest movement) |
Body position | Measured or observed | Possible but optional | Possible | Yes | No |
Sleep staging | Yes | Yes | No | No | No |
Sleep surrogate | Not applicable | Not applicable | Possible | Yes (PAT actigraphy) | No |
Leg movement | Documented by EMG or motion sensor | Possible but optional | Possible but optional | No | No |
Personnel | Present | Absent | Absent | Absent | Absent |
Interventions possible | Yes | No | No | No | No |
Respiratory event terminology (denominator) | AHI (total sleep time) | AHI (total sleep time) | REI (total recording time) | pAHI, pRDI (PAT algorithm) | REI (total recording time) |