Pulmonary Function Test (PFT)

What is a Pulmonary Function Test?

A Pulmonary Function Test (PFT) is a simple, non-invasive breathing test that checks how well your lungs are working. It measures how much air you can breathe in and out and how effectively your lungs deliver oxygen to your body.

Why is it done? (Indications)

Your doctor may recommend a PFT to:

• Diagnose lung conditions such as asthma, chronic bronchitis, or COPD
• Evaluate shortness of breath or chronic cough
• Monitor lung function in people with known lung disease
• Assess lung fitness before surgery
• Check the effect of treatment or medications on lung function

How is the test done?

During the test, you will be asked to breathe in and out through a mouthpiece connected to a machine called a spirometer. A nose clip may be used to prevent air from escaping. You will be guided to take deep breaths and blow out as hard and fast as you can. The test usually takes about 20–30 minutes and may be repeated after using an inhaler.

Do’s before the test

• Wear loose, comfortable clothing
• Follow your doctor’s instructions about inhalers or medications
• Inform the technician if you have recent illness, chest pain, or surgery
• Inform technician if you have any allergies to albuterol inhalers

Don’ts before the test

• Do not smoke for at least 4–6 hours before the test
• Avoid heavy meals just before the test
• Do not do strenuous exercise on the day of the test
• Avoid caffeine (coffee, tea, energy drinks) for a few hours before the test
• Do not use your inhalers at least 4 to 6 hours prior to your test.

The test is safe, painless, and you can usually return to normal activities immediately afterward