Certified Pulmonary Function Technologist (CPFT) Practice Exam

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What is the normal FEV1 percentage?

The correct answer is: 80%

The normal FEV1 (Forced Expiratory Volume in one second) percentage typically refers to the ratio of the FEV1 to the forced vital capacity (FVC) expressed as a percentage, which is a key metric in assessing lung function, particularly in diagnosing obstructive and restrictive airway diseases. In healthy individuals, the FEV1/FVC ratio is generally expected to be around 80%, indicating that approximately 80% of the total volume of air can be forcibly expelled in the first second of a maximal expiration. This percentage is considered a benchmark for normal respiratory function in adults, reflecting efficient lung mechanics. Therefore, recognizing that 80% is the threshold that defines normal function is crucial in evaluating and interpreting pulmonary function tests. Other values like 60%, 70%, or 90% represent deviations from the norm and could indicate varying degrees of obstruction or restriction in lung function, thus they are not considered normal.