A spirometer is a device that assesses your lung function. It measures the amount and speed of air expelled from your lungs.

This test may be done to help your health care provider give you a more accurate prognosis or craft your treatment plan.

Peak flow measurement is a procedure that records the amount of air flowing out of your lungs. Peak flow can be measured with either a spirometer or a peak flow meter.

Pulmonary function tests measure how well your lungs are functioning and are used to help diagnose certain lung disorders.

Oximetry is a procedure used to measure the oxygen level—or oxygen saturation—in the blood.