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FEV1 is the peak during the first second of exhalation only.

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12y ago
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3w ago

FEV1 (forced expiratory volume in 1 second) measures the amount of air a person can forcefully exhale in 1 second, which is an indicator of lung function. Peak expiratory flow (PEF) measures the maximum speed at which a person can exhale air during a forced breath, providing information on how well the airways are functioning. Both tests are used in the diagnosis and monitoring of respiratory conditions such as Asthma and COPD.

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Q: What is the difference between the FEV1 and peak expiratory flow?
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