Pulmonary ========= ARDS Asthma A-a Gradient Bilateral Interstitial Infiltrates Bohr Effect Acidosis from tissue CO2 displaces oxygen Bronchiolitis Bronchitis COPD Croup Empyema Hemoptysis Non-Cardiogenic Pulm Edema Oxygen Saturation Pneumonia Pneumothorax Pulmonary Embolism Sarcoidosis Urinothorax: A pleural fluid to serum creatinine ratio of greater than one confirms the diagnosis of urinothorax. URIs Ventilator Settings