Introduction. The diagnosis of respiratory diseases and the evaluation of their functional effect sometimes may be made by appropriate history taking and physical examination. However, in most instances applicable laboratory, radiological and bedside procedures are necessary for a definitive diagnosis, accurate functional assessment and close monitoring. Pulmonary function test (PFTs) provide objective means for determination of the presence or absence of functional impairment of the respiratory system and allow assessment of its severity, progression, and response to therapeutic measures. These tests are essential in the diagnosis and management of asthma, however the results of the studies should always be interpreted in light of clinical information, and by considering their accuracy, sensitivity and specificity. This is a review article.
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