Why do I need a lung function test?You may need this test if you:Have symptoms of a breathing problem such as shortness of breath, wheezing, and/or coughingHave a chronic lung diseaseHave been exposed to asbestos or other substances known to cause lung damageHave scleroderma, a disease that damages connective tissueHave sarcoidosis, a disease that causes damage to cells around the lungs, liver, and other organsHave a respiratory infectionHad an abnormal chest x-rayAre scheduled for an operation such as abdominal or lung surgery
