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Your doctor will order these tests to determine how your lungs are working. If you already have a condition that’s affecting your lungs, your doctor may order this test to see if the condition is progressing or how it’s responding to treatment.

PFTs can help diagnose:

• asthma

• allergies

• chronic bronchitis

• respiratory infections

• lung fibrosis

• bronchiectasis, a condition in which the airways in the lungs stretch and widen

• COPD, which used to be called emphysema

• asbestosis, a condition caused by exposure to asbestos

• sarcoidosis, an inflammation of your lungs, liver, lymph nodes, eyes, skin, or other tissues

• scleroderma, a disease that affects your connective tissue

• pulmonary tumor

• lung cancer

• weaknesses of the chest wall muscles