Spirometry: dynamic lung volumes -- Static (absolute) lung volumes -- Diffusing capacity of the lungs -- Bronchodilators and bronchial challenge testing -- Arterial blood gases -- Other tests of lung mechanics: resistance and compliance -- Distribution of ventilation -- Maximal respiratory pressures -- Preoperative pulmonary function testing -- Simple tests of exercise capacity -- Patterns in various diseases -- When to test and what to order -- Approaches to interpreting pulmonary function tests -- Illustrative cases.