Pulmonary Function Tests (PFT)

A group of tests that measures the function of the lungs, diagnoses problems with the lungs, and/or determines how well treatment for a lung condition is working.

Parts of the Body Involved

Lungs, mouth, windpipe

Reasons for Procedure

  • To help diagnose suspected lung conditions or diseases, such as:
    • Asthma
    • Emphysema
    • Chronic bronchitis
  • To quantify pulmonary disability
  • To determine the effectiveness of medication given for a known lung condition
  • To evaluate a patient's condition before surgery

Risk Factors for Complications during the Procedure

These tests should not be administered to patients who have:
  • An unstable heart or lung disease
  • Recently suffered a heart attack
  • Active tuberculosis
  • An acute asthma attack
  • Respiratory distress
  • Active bleeding from the lower respiratory tract

What to Expect

Prior to Procedure:
  • Review your medications with your doctor; there may be some that you should stop taking before testing
  • Don't eat, smoke, or exercise for 4-8 hours before testing
  • Wear loose fitting clothing
During Procedure - You'll be asked to exhale and inhale in different patterns and speeds into pulmonary testing devices, and you'll be able to rest between tests.

Anesthesia

Outcome

Your doctor will compare the results of your tests with charts of normal values based on your age, sex, and height. If your values are less than 80% of the normal values, then you probably have some type of lung disease. The results of the individual tests may help your doctor diagnose a specific disorder. Your doctor will discuss the results with you, and, if necessary, recommend medication and/or other treatment options best suited for you.

Call Your Doctor If Any of the Following Occurs

  • Headaches, nausea, muscle aches, dizziness, or general ill feeling
  • Shortness of breath or difficulty breathing
  • Chest pains after testing