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Pulmonary function testing is a cornerstone in the diagnosis and management of individuals with respiratory disease. However, correct interpretation of pulmonary function data relies heavily on acceptable test quality, which in turn is dependent on several factors including equipment, trained personnel, and patient cooperation and effort. This article briefly reviews key principles of patient instruction and several aspects of pulmonary function testing, and discusses factors that hamper performance. The authors also offer several coaching suggestions and examples readers may find useful in their practice.