| FEV1 |
It is the volume expired in the first second of forced expiration. FVC is the total volume expired during forced expiration.)
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| FEV1 |
When expressed as a percent of predicted, this is best measure of the severity of obstruction. An absolute value of < 1 L indicates severe obstruction while an FEV1 of 1 to 2 L indicates moderate obstruction.)
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| TLC (total lung capacity) |
Elevated when lungs are hyperinflated.
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| RV (residual volume) |
Reduced in restrictive lung disease.)
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| DLCO (diffusion capacity) ) |
Reduced when lung parenchyma is obliterated.
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