| About: Alveolar-arterial oxygen gradient (A-a gradient) |
| Calculating the A-a gradient can help the clinician determine the severity of pulmonary shunting. This can be useful in following the progression of a disease, and also may be a more subtle assessment of pulmonary disease than the oxygen saturation or the partial pressure of oxygen. This value is used in other tools, such as the Apache II score. |
| Go to the tool |