Pulmonary function tests are those that measure the ability of the lungs to take in and release air as well as how well they can move various gases from the atmosphere into the body’s circulation.

The test will be performed with an instrument called a spirometer, which measures airflow. You will breathe into a mouthpiece that is connected to the spirometer. The spirometer will record the amount and rate of air that you breathe in and out over a certain period of time.

To prepare for this test, do not eat a large meal prior to the examination and do not smoke 4 to 6 hours before the appointment. Serevent and Advair cannot be taken 12 hours prior to the test and Ventolin, Atrovent, and Bricanyl cannot be taken 4 hours prior to the test. Special instructions will be given to those who use bronchodilators or other inhaler medications.