What Are Pulmonary Function Tests (PFTs)? Pulmonary function tests (PFTs) are lung tests. They show how well your lungs work. They’re noninvasive, which means that the doctor doesn’t cut you or put ...

What Are Pulmonary Function Tests? To diagnose asthma, your doctor will review your symptoms, your medical and family history, and may do lung function tests (also called pulmonary function tests).