Diagnostic tests of lung function.

Objective measurements of a wide variety of aspects of respiratory function can be useful in the evaluation and management of children and adolescents who have respiratory symptoms or disorders. Many of the tests described in this article can be performed reasonably in the pediatrician's office. Pediatricians can be comfortable in measuring and interpreting pulse oximetry, blood gas analysis, spirometry, and peak flow. They also should be familiar with the indications for the less common tests of pulmonary function that now are widely available.