| 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) | |
