Background and Objective. The concentration of exhaled nitric oxide (eNO), reflecting the activity of inducible NO synthase in\nairway epithelium, has been found to increase in patients with obstructive sleep apnea (OSA). This study aimed to measure\neNO concentration in patients with suspected OSA and to correlate different eNO parameters with clinical and sleep apnea\ncharacteristics. Methods. In this cross-sectional study, all patients underwent in-lab overnight polysomnography (PSG) and eNO\nmeasurement using a method of multiple flow rates before and after PSG (pre- and post-PSG). Results. According to the result of\nPSG, 82 persons were divided into two groups: control subjects (
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