What is pulmonary function testing?

These are a series of measurements used by your provider to determine how well the lungs are functioning. This could reveal lung abnormalities and/or progression of lung disease and aid in the development of a care plan for therapies and treatment. 

Most pulmonary function tests include spirometry, which has patients breath through a mouthpiece to record the amount of air coming in and going out of the lungs. 

How to Prepare for a Pulmonary Function Test

  • Do not smoke for at least four hours prior to the test
  • Wear loose, comfortable clothing for natural breathing
  • Do not eat a big meal before the test
  • Discontinue inhaled/nebulizer medication for four to six hours prior to test. 


If you have any questions prior to your test, call Respiratory Care at 515-386-0469.