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Obstructive sleep apnoea (OSA) is defined as episodes of obstructive apnoeas and hypopnoeas during sleep with daytime somnolence. The gold standard in diagnostic tool patients with these symptoms is polisomnography. The goals of this study were to determine the frequency of OSA symptoms and the prevalence of OSA in patients undergoing operation. Patients were asked questions pertaining to symptoms of sleep apnoea. The patients who had two major symptoms or one major and two minor symptoms were invited to undergo a sleep study. Patients were diagnosed as OSA when they had apnoea–hypopnoea index higher than five. Forty-one patients with two major or one major and two minor symptoms of 433 patients were referred to the sleep laboratory. The most frequent major symptom was snoring, and the most frequent minor symptom was morning tiredness. In this connection, 18 (43.9 …