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Outpatient Services

Pulmonary Function Testing

Outpatient Services > What to Expect

What to expect

Before your test, you will receive specific instructions on how to prepare. If you smoke, you should not do so for four to six hours before the test. You shouldn’t eat a heavy meal right before the test.

During the test, you will breathe into a mouthpiece that is connected to a spirometer, which measures your breathing rate and the volume of air you are moving. For part of the test, you will breathe normally; for other parts, you will need to breathe harder or faster. You may be asked to inhale a harmless tracer gas to help determine how efficiently your lungs move air into the bloodstream.

>> Learn more about lung function tests

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