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Lung Function Tests
Lung Function Tests

Residual Volume

February 15th, 2021


The residual volume is the volume left in the lungs after a maximal expiration.

Increased Residual Volume

An increase in residual volume is suggestive of gas trapping.
  • Causes of Increased Residual Volume

  • Asthma
  • Emphysema

Reduced Residual Volume

A reduction in residual volume suggests a parenchymal cause of restrictive lung disease.
  • Causes of Reduced Residual Volume

  • Pulmonary fibrosis
  • Sarcoidosis
  • Atelectasis
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