What is the Predicted Alveolar-arterial Gradient calculator?
The predicted Alveolar-arterial gradient calculator allows the user to determine the predicted A-a gradient based on the patient’s age. The expected “normal” A-a gradient increases with age, and the upper end of the normal range of this gradient can be predicted with this formula. Naturally, this tool does not replace clinical judgement, but serves as an aid in decision-making.