Forced expiratory volume tests are used to differentiate between restrictive and obstructive lung disorders.

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Forced expiratory volume tests measure how much air a person can forcefully exhale in one second (FEV1) and how much air they can exhale in total (FVC). By comparing the FEV1 to the FVC, doctors can determine whether a lung disorder is restrictive (where the problem is with inhaling and the FVC is low) or obstructive (where the problem is with exhaling and the FEV1 is low).

Forced Expiratory Volume Tests Are Used to Differentiate Between Restrictive