If the history is positie, then it is followed by polysomnography, an oernight sleep study that usually looks at sleep stages, time in stages, oxygenation, CO2 leels, time spent in less than 90% O2 saturation, and RDI.

• 如果规律性研究结果是正性的，那么接下来就要用多导睡眠描记法检查，一种通常观察睡眠分期，各期时间，氧气，二氧化碳水平，饱和90%25以下氧气的时间，及RDI的通宵睡眠研究。