- Serious comorbid disease. Clinically significant pulmonary symptomatology. In patients with a history of symptomatic pulmonary disease, pulmonary function tests (PFTs) should document an forced expiratory volume at 1 second (FeV1), forced vital capacity (FVC), and total lung capacity (TLC) of > 60% predicted and carbon monoxide diffusing capacity of the lung (DLCO) of > 50% predicted. No clinically significant cardiac symptomatology. The cardiac ejection fraction must be > 50%.