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Pulmonary Function Tests (PFT) are a non-invasive way to measure various aspects of the lungs to evaluate how the lungs are functioning and what issues may be going on.
Spirometry is the most common of the PFTs, measuring lung function, specifically the amount (volume) and/or speed (flow) of air that can be inhaled and exhaled.

FVC - Forced vital capacity: the determination of the vital capacity from a maximally forced expiratory effort.
FEV1 - Forced expiratory volume (time): Volume that has been exhaled at the end of the first second of forced expiration.
PEF - Peak expiratory flow: The highest forced expiratory flow measured with a peak flow meter.