Which pulmonary function tests best differentiate between COPD phenotypes?

Abstract excerpt

We are still at the early phase of finding useful phenotypes in COPD that can guide therapy. However, in a simple sense, "sick patients die." Many phenotypic measurements of severity correlate with mortality in COPD: FEV(1), the ratio of inspiratory capacity to total lung capacity (IC/TLC), diffusing capacity of the lung for carbon monoxide (D(LCO)), 6-min walk distance, and maximum oxygen (O(2)) consumption or...

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