Editorial Staff and Contributors
Pulmonary function tests (PFTs) are a group of breathing tests. They can show how well your lungs are working. PFTs may measure:
PFTs may be used to diagnose lung conditions or diseases, such as:
These tests may also be done to:
There are no major complications associated with this procedure.
Most tests will require you to breathe into a mouthpiece. The mouthpiece may be attached to a simple handheld device or be part of a larger machine. Examples of devices are a
peak flow meter. You may be asked to breathe in and out in different patterns and speeds. You will rest between tests.
Tell the technician right away if you have breathing problems, pain, or
Other tests that may be used in some situations include:
Rest until you feel able to leave. You may be given medication if testing has caused wheezing, coughing, and/or difficulty breathing.
The test does not hurt. You may feel symptoms of your lung condition during or immediately following testing.
Your doctor will compare the results of your tests with normal values based on your age, sex, and height, or previous test results. Your doctor will discuss the results with you and decide if further testing or treatment is needed.
After the test, call your doctor if any of the following occurs:
American Lung Association
Family Doctor—American Academy of Family Physicians
The Lung Association
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Last reviewed August 2014 by Michael Woods, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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