Certified Pulmonary Function Technologist (CPFT) Practice Exam

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What does a high FEV1/FVC ratio typically indicate?

Obstructive lung disease

Restrictive lung pattern

A high FEV1/FVC ratio generally indicates a restrictive lung pattern. In restrictive lung diseases, such as pulmonary fibrosis or other conditions where lung expansion is impaired, both FEV1 (forced expiratory volume in one second) and FVC (forced vital capacity) are reduced, but the volume of air expelled in the first second (FEV1) maintains a relatively higher proportion of the total volume (FVC). As a result, the FEV1/FVC ratio remains normal or can be increased.

Normal lung function typically shows an FEV1/FVC ratio above 70% or greater. A high ratio does not indicate obstruction, which is characterized by a lower FEV1/FVC ratio due to disproportionately low FEV1 compared to FVC. Therefore, this data underlines that restrictive lung patterns are the correct association with a high FEV1/FVC ratio.

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Normal lung function

Severe airflow limitation

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