Symptoms | Dyspnea (75 to 90%) | Nonproductive cough (50 to 93%) | Chest discomfort | | Signs | Fever | Tachypnea | Crackles | Cyanosis | | Laboratory | PFTs show reduced lung volumes and DLCO | Oximetry shows decreased oxygen saturation (at rest or on exertion); ABGs show increased alveolar-arterial oxygen gradient | No peripheral blood eosinophilia (except possibly in hypersensitivity-like reaction) | |