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A lung function test, also known as a pulmonary function test, can help determine how well your lungs are working and may be used to diagnose shortness of breath. Some types of lung function tests include:
Spirometry
A common test that measures how much air you can inhale and exhale, and how quickly you can exhale. During the test, you'll breathe into a mouthpiece attached to a spirometer, a small machine that measures your breathing. Your doctor may ask you to repeat the test after taking an inhaler or other medication to help open your airways.
6-minute walk test
During this test, you'll walk as far as you can in six minutes while your heart rate and blood oxygen levels are monitored. You'll also rate how short of breath and fatigued you feel.
Lung diffusion testing (DLCO)
A noninvasive test that provides information about how well your lungs are working.
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