Lung Function Tests
In rare cases, a
bronchospasm can occur with inhalation challenge
testing. You will be closely monitored during and after the test.
Exercise stress tests
Exercise stress tests
evaluate the effect of exercise on lung function tests. Spirometry readings are
done after exercise and then again at rest.
Multiple-breath washout test
washout test is done to check lung function in people with cystic fibrosis. For
this test, you breathe air that contains a tracer gas through a tube. Then you
breathe regular air while the amount of tracer gas you exhale is monitored.
Test results are reported as a lung clearance index (LCI). A high LCI value
means that the lungs are not working well.
Lung function results are measured directly in some
tests and are calculated in others. No single test can determine all of the
lung function values, so more than one type of test may be done. Some of the
tests may be repeated after you inhale medicine that enlarges your airways
Why It Is Done
Lung function tests are done to:
- Determine the cause of breathing
- Diagnose certain lung diseases, such as
chronic obstructive pulmonary disease (COPD).
- Evaluate a person's lung function before
- Check the lung function of a person who is regularly
exposed to substances that can damage the lungs.
- Check the effectiveness of treatment for lung diseases.
How To Prepare
Tell your doctor if you:
- Have had recent chest pains or a
- Take medicine for a lung
problem such as asthma. You may need to stop taking some medicines before
- Are allergic to any medicines.
- Have had recent
surgery on your eyes, chest, or abdomen, or if you have had a collapsed lung
Do not eat a heavy meal just before this test because a
full stomach may prevent your lungs from fully expanding. You should not smoke
or exercise vigorously for 6 hours before the test. On the day of the test,
wear loose clothing that does not restrict your breathing in any way. You
should also avoid food or drinks that have caffeine because it can cause your
airways to relax and allow more air than usual to pass through.
you have dentures, wear them during the test to help you form a tight seal
around the mouthpiece of the spirometer.