On the other hand, a Level 3 sleep study is a home-based test and involves fewer channels of data collection. It usually monitors four to seven parameters, including oxygen saturation, heart rate, airflow, and respiratory effort. Unlike Level 1, it does not record EEG, so it cannot determine sleep stages or differentiate between sleep and wakefulness. Level 3 studies are primarily used to screen and diagnose moderate to severe obstructive sleep apnea in patients who have a high pre-test probability and no other serious medical conditions. The convenience and lower cost of this home-based test make it an attractive option, especially for initial screening.
Both Level 1 and Level 3 sleep studies have important roles. Level 1 is preferred for complex or unclear cases where detailed analysis is required. Level 3 is ideal for straightforward cases and for patients who prefer testing at home. However, if Level 3 results are inconclusive, a follow-up with a Level 1 study may be recommended.
In conclusion, Level 1 and Level 3 sleep studies are critical tools that help diagnose and manage sleep disorders effectively. The choice depends on the patient’s symptoms, risk factors, and clinical needs.
