Certified Pulmonary Function Technologist (CPFT) Practice Exam

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What is typically the FEV1/FVC ratio for a normal lung function?

  1. Less than 50%

  2. 50%-65%

  3. 70%-80%

  4. Above 80%

The correct answer is: 70%-80%

The FEV1/FVC ratio is a critical metric in pulmonary function testing that helps assess lung health. In individuals with normal lung function, this ratio typically falls within the range of 70% to 80%. This range indicates that during a forced expiratory maneuver, 70% to 80% of the total forced vital capacity (FVC) can be exhaled in the first second (FEV1). This proportion is indicative of normal airflow and suggests that there is no significant obstruction in the airways, which can occur in various pulmonary conditions. A lower ratio would suggest potential restrictive or obstructive lung conditions. Values above 80% might reflect a highly efficient expulsion of air, but this is more commonly observed in healthy individuals typically falling within the 70%-80% range. Thus, the correct understanding of lung function delineates the FEV1/FVC ratio as a valuable tool in diagnosing and monitoring respiratory health.