Polysomnography (sleep study) is essential for the diagnosis of sleep apnea. It serves to confirm the presence of sleep apnea and exclude other causes of excessive daytime somnolence such as narcolepsy, insufficient amount of sleep, and periodic limb movement disorder. Moreover, polysomnography determines the severity of the sleep apnea since the information obtained from the medical history and physical examination in any particular patient is a poor indicator of the level of the disease severity . In addition, polysomnography allows for continuous positive airway pressure (CPAP) titration and initiation of CPAP therapy.
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