Before the test, a technician places soft clips on your nose. This allows you to breathe only through a tube that's attached to the testing machine. The technician will tell you how to breathe into the tube. For example, you may be asked to breathe normally, slowly, or rapidly.
For this test, you sit in a clear glass booth, with the door closed, and breathe through the tube attached to the testing machine. The changes in pressure inside the booth are measured to show how much air you can breathe into your lungs.
After the test, you can return to your normal activities and restart your medicines after lung function tests. Talk to your doctor about when you will get the test results.
This test shows the size of your lungs. Abnormal test results may show that you have lung tissue scarring or a stiff chest wall.