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8. Diagnosis

Lung hyperinflation is diagnosed by measuring the lungs' functional residual capacity (FRC) and residual volume (RV). FRC is the volume of air remaining the lungs during normal expiration, and RV is the volume remaining following maximum exhalation. Lung hyperinflation is most accurately diagnosed using body plethysmography, though doctors generally measure FRC and RV with a spirometer, a device into which a person breathes. They may also use alternative respiratory function tests, but the results are not as reliable.

diagnosis plethysmography spirometer FRC RV Koldunova_Anna / Getty Images

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