Alveolar/Arterial Gradient and Arterial/Alveolar Oxygen Ratio
is a topic covered in the Davis's Lab & Diagnostic Tests
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Alveolar-arterial difference, A/a gradient, a/A ratio.
To assist in assessing oxygen delivery and diagnosing causes of hypoxemia, such as pulmonary edema, acute respiratory distress syndrome, and pulmonary fibrosis.
There are no food, fluid, activity, or medication restrictions unless by medical direction. Indicate the type of oxygen, mode of oxygen delivery, and delivery rate as part of the test requisition process. Wait 30 min after a change in type or mode of oxygen delivery or rate for specimen collection.
Method: Selective electrodes that measure Po2 and Pco2.
|Alveolar/arterial gradient||Less than 10 mm Hg at rest (room air); 20–30 mm Hg at maximum exercise activity (room air)|
|Arterial/alveolar oxygen ratio||Greater than 0.75 (75%)|
|Values normally increase with increasing age (see study titled "Blood Gases").|
Critical Findings and Potential Interventions
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Bladh, Mickey Lynn., and Anne M. Van Leeuwen. "Alveolar/Arterial Gradient and Arterial/Alveolar Oxygen Ratio." Davis's Lab & Diagnostic Tests, 7th ed., F.A. Davis Company, 2017. Nursing Central, nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425247/3/Alveolar_Arterial_Gradient_and_Arterial_Alveolar_Oxygen_Ratio.
Bladh ML, Van Leeuwen AM. Alveolar/Arterial Gradient and Arterial/Alveolar Oxygen Ratio. Davis's Lab & Diagnostic Tests. 7th ed. F.A. Davis Company; 2017. https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425247/3/Alveolar_Arterial_Gradient_and_Arterial_Alveolar_Oxygen_Ratio. Accessed November 17, 2019.
Bladh, M. L., & Van Leeuwen, A. M. (2017). Alveolar/Arterial Gradient and Arterial/Alveolar Oxygen Ratio. In Davis's Lab & Diagnostic Tests. Available from https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425247/3/Alveolar_Arterial_Gradient_and_Arterial_Alveolar_Oxygen_Ratio
Bladh ML, Van Leeuwen AM. Alveolar/Arterial Gradient and Arterial/Alveolar Oxygen Ratio [Internet]. In: Davis's Lab & Diagnostic Tests. F.A. Davis Company; 2017. [cited 2019 November 17]. Available from: https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425247/3/Alveolar_Arterial_Gradient_and_Arterial_Alveolar_Oxygen_Ratio.
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T1 - Alveolar/Arterial Gradient and Arterial/Alveolar Oxygen Ratio
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A1 - Bladh,Mickey Lynn,
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BT - Davis's Laboratory & Diagnostic Tests
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