FEV1/FVC ratio
FEV1/FVC Ratio
The FEV1/FVC ratio (pronounced as F-E-V-one over F-V-C ratio) is a calculated ratio used in the diagnosis of obstructive and restrictive lung disease. It represents the proportion of a person's vital capacity that they are able to expire in the first second of forced expiration (FEV1) to the full, forced vital capacity (FVC).
Etymology
The term "FEV1/FVC ratio" is an acronym derived from the terms Forced Expiratory Volume in 1 second (FEV1) and Forced Vital Capacity (FVC).
Related Terms
- Spirometry: A pulmonary function test that measures the amount (volume) and/or speed (flow) of air that can be inhaled and exhaled.
- Obstructive Lung Disease: A type of lung disease that occurs due to obstruction in the airways of the lungs.
- Restrictive Lung Disease: A category of extrapulmonary, pleural, or parenchymal respiratory diseases that restrict lung expansion.
- Chronic Obstructive Pulmonary Disease (COPD): A type of obstructive lung disease characterized by long-term breathing problems and poor airflow.
- Asthma: A condition in which a person's airways become inflamed, narrow and swell, and produce extra mucus, which makes it difficult to breathe.
Usage
The FEV1/FVC ratio is a key measure in spirometry testing and is particularly important in diagnosing conditions such as COPD and asthma. A lower than normal FEV1/FVC ratio (less than 70%) indicates an obstructive lung disease such as COPD or asthma. A normal or high FEV1/FVC ratio (greater than or equal to 70%) can indicate a restrictive lung disease.
External links
- Medical encyclopedia article on FEV1/FVC ratio
- Wikipedia's article - FEV1/FVC ratio
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