PFTs (pulmonary function tests) are lung tests. They demonstrate how well your lungs function. They are noninvasive, which means the doctor will not cut you or insert any tools into your body. Your doctor selects your tests based on what they need to learn. Each test operates in a unique manner. Spirometry This is a very common pulmonary function test. Spirometry measures how much air you can inhale and exhale. It also evaluates how quickly you can expel air from your lungs. Spirometry aids in the diagnosis of respiratory disorders such as asthma and COPD. Spirometry can help your doctor determine how well your asthma medication is working if you are taking it. During the test, you will take in as much air as possible. Then you'll immediately blow out as much air as you can through a tube connected to a spirometer. Body plethysmography, which measures how much air is in your lungs as you inhale, will require you to take deep breaths. It also measures how much air remains in your lungs after you have expelled as much as you can.
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