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Criteria for pulmonary function test interpretation
| Parameter |
Criteria for abnormality |
|
|---|---|---|
| Conventional | Percentile | |
| FEV1 | <80% predicted | <5th |
| FVC | <80% predicted | <5th |
| FEV1/FVC | <0.70 observed | <5th |
| TLC | <80% predicted | <5th |
| >120% predicted | >95th | |
| RV | <80% predicted | <5th |
| >140% predicted | >95th | |
| DLco | <75% predicted | <5th |
DLco Diffusing capacity of the lung for carbon monoxide; FEV1 Forced expiratory volume in 1 s; FVC Forced vital capacity; RV Residual volume; TLC Total lung capacity
