Differential diagnosis of hypoxia with normal chest x ray are :
-chronic alveolar hypoventilation
-asthma
-early pneumonia
-pulmonary embolism
-pulmonary hypertension
-early interstitial lung disease
-atrial septal defect
-ventricular septal defect
-arteriovenous malformation
-atelectasis
-early pneumocystis pneumonia
-chronic alveolar hypoventilation
-asthma
-early pneumonia
-pulmonary embolism
-pulmonary hypertension
-early interstitial lung disease
-atrial septal defect
-ventricular septal defect
-arteriovenous malformation
-atelectasis
-early pneumocystis pneumonia