FEV1 (Forced Expiratory Volume in 1 second) is the volume of air expelled in the first second of a forced breath out. FEV1/FVC ratio (Tiffeneau index) < 0.70 is diagnostic of obstructive lung disease. FEV1 < 80% predicted indicates airflow limitation.
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Did You Know?
COPD (the leading cause of reduced FEV1) affects over 300 million people worldwide and is the third leading cause of death. Spirometry can detect it years before symptoms appear.
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