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Introduction: Obstructive sleep apnea syndrome is the most common sleep disordered breathing (SDB) and is associated with recurrent episodes of upper airway (UA) collapse during sleep. Arousal from sleep is required to re-establish the airway patency. Patients with OSAS have various structural and functional abnormalities of the upper airway during sleep, which may reflect on their pulmonary function tests. Material and methods: We performed spirometry in 50 diagnosed OSAS patients. Spirometric indices like FEF50/ FIF50 >1 and saw tooth appearance of FV loops were studied. Their association with OSA and grades of OSA was evaluated using statistical analysis. Results: It was found that these spirometric indices were common in OSAS patients but their association with grades of OSA were not statistically significant. Conclusion: Spirometry findings can point toward diagnosis of OSA but these findings are absent in most OSA patients.

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