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FEV1 / FVC ratio

Authoring team

The FEV1/FVC ratio is the ratio of the forced expiratory volume in the first one second to the forced vital capacity of the lungs.

The normal value for this ratio is above 0.75-85, though this is age dependent.

  • values less than 0.70 are suggestive of airflow limitation with an obstructive pattern
  • restrictive lung diseases often produce a FEV1/FVC ratio which is either normal or high

Reference:

  1. The Practitioner 2005; 249:180-88.

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The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

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