title: Letter: Summing PaCO2 and PaO2: a simple expedient for determining alveolar-arterial PO2 difference.
mesh_terms: D002245:Carbon Dioxide / Q000032:analysis; D006801:Humans; D010100:Oxygen / Q000032:analysis*; D011650:Pulmonary Alveoli / Q000032:analysis; D014692:Ventilation-Perfusion Ratio
chemical_list: D002245:Carbon Dioxide; D010100:Oxygen