Pulmonary function tests are a painless way to measure how well your lungs are working. A complete series has 3 tests. You may be given the entire series or only certain parts. The results may explain; Shortness of Breath, The type of lung problem, How smoking may have affected the lungs, and Whether breathing problems are a risk during general anesthesia.
During the test the tech will coach you through out the process. You will be sitting in a clear plastic box that looks like a phone booth. You will wear a nose clip so you breathe only through your mouth. If you happen to get tired, you can take a break between tests. Testing runs about 30 minutes. Depending on your ability to perform the test.
After testing, you can return to your normal diet and activity. If you were told to skip medications before testing, ask if you should take them when testing is completed. Your Doctor will go over the test results at your next office visit.