Spirometry is a type of Pulmonary Function Test that measures some lung volumes and flowrates, which can be used to investigate some lung conditions when full Pulmonary Function Testing isn’t needed.

Spirometry is a test that measures the amount of air you breathe in and out. Spirometry is the best test to diagnose asthma and COPD.

How to Prepare for This Test

  • To prepare for your spirometry test:
  • Do not smoke for one hour before test
  • Do not drink alcohol within four hours of test
  • Do not eat a large meal within two hours of test
  • Please wear loose clothing
  • Do not perform vigorous exercise within 30 minutes of test
  • If you are on puffer medications, you may be asked to not take them for a few hours before spirometry. Ask your doctor (or the center performing the test) beforehand if this applies to you.

What to Expect During This Test

Your nose will be clipped and you will breathe in and out through your mouth into a mouthpiece attached to a machine. The respiratory therapist or doctor will instruct you to change your breathing throughout the test. You may also breathe in a tracer gas that will measure the exchange of oxygen and carbon dioxide in your lungs