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Pulmonary function tests measure the volume and the rate of airflow in the lungs. The purpose of the pulmonary function test is to diagnose and measure the severity of breathing problems. This test is accurate only if the patient cooperates by breathing properly into the mouthpiece. During the test, the patient may be required to breathe normally, or to breathe in and out as deeply and completely as possible. The measurement requiring the most effort is blowing (exhaling) into the mouthpiece quickly and completely, as possible.
A pulmonary function test may also include placement of a strap around the chest to measure volume and pressure. By measuring a variety of breathing functions, the pulmonary function test can determine more than a dozen lung measurements. If scheduled for a pulmonary function test, eat only a light meal and do not smoke for 4 to 6 hours before. Patients with asthma may be instructed to stop their asthma medication for a specific period before the test. The test is painless and time is allowed for resting between the different breathing measurements. The technician conducting the test will instruct you on how to breathe and encourage you during your efforts. Most of the measurements are repeated 3 or more times. Patients are carefully monitored for any signs of distress. Be sure to ask your doctor or the technician if you have any questions about the pulmonary function test. Article #4946 Copyright (c) 2002 McKesson. All Rights Reserved. |
