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Updated June 11, 2014

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Definition: Measured by a pulmonary function test known as spirometry, FEV1/FVC (FEV1% or %FEV1) is a number that represents the ratio of your forced expiratory volume in one second (FEV1) to your forced vital capacity (FVC). The value measures the percentage of the total FVC that is expelled from your lungs during the first second of a forced exhalation. FEV1/FVC is extremely important in the diagnosis of ostructive and restrictive lung diseases.
Also Known As: FEV1%, %FEV1
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