The FEV1, in particular, is an established measure associated with increased mortality.30,37 However, a DLCO <85% predicted, in the absence of other pulmonary impairment, is also associated with increased mortality in the general population.38 Of PFT measures, DLCO was most closely associated with mortality in a recent study.39 DLCO has been predictive of morbidity and mortality in a number of spe