Sometimes a patient will participate in a sleep study to identify or confirm a diagnosis of sleep apnea.
Imagine their surprise, then, when they discover they need to go back to the sleep center and take part in yet another sleep study?
This doesn't always happen; some sleep studies identify sleep disorders other than sleep apnea, and they usually only require one trip to the sleep lab for diagnosis.
For those who do have sleep apnea, they might undergo a same-night "split night study" to both diagnose and treat moderate to severe sleep apnea, which doesn't usually require a return trip to the lab. This is because they have more severe symptoms and have been "green lighted" by the sleep physician to start therapy right away.
However, someone who has mild to moderate sleep apnea may need to return for a test called a CPAP titration study.