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Alveolar/Arterial Gradient and Arterial/Alveolar Oxygen Ratio

Alveolar/Arterial Gradient and Arterial/Alveolar Oxygen Ratio is a topic covered in the Davis's Lab & Diagnostic Tests.

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General

Synonym/Acronym:
Alveolar-arterial difference, A/a gradient, a/A ratio.

Common Use:
To assist in assessing oxygen delivery and diagnosing causes of hypoxemia such as pulmonary edema, acute respiratory distress syndrome, and pulmonary fibrosis.

Specimen:
Arterial blood collected in a heparinized syringe. Specimen should be transported tightly capped and in an ice slurry.

Normal Findings:
(Method: Selective electrodes that measure Po2 and Pco2)

Alveolar/arterial gradientLess than 10 mm Hg at rest (room air)
20–30 mm Hg at maximum exercise activity (room air)
Arterial/alveolar oxygen ratioGreater than 0.75 (75%)

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Citation

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/all/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/all/Alveolar_Arterial_Gradient_and_Arterial_Alveolar_Oxygen_Ratio. Accessed April 23, 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/all/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 April 23]. Available from: https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425247/all/Alveolar_Arterial_Gradient_and_Arterial_Alveolar_Oxygen_Ratio.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC T1 - Alveolar/Arterial Gradient and Arterial/Alveolar Oxygen Ratio ID - 425247 A1 - Bladh,Mickey Lynn, AU - Van Leeuwen,Anne M, BT - Davis's Laboratory & Diagnostic Tests UR - https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425247/all/Alveolar_Arterial_Gradient_and_Arterial_Alveolar_Oxygen_Ratio PB - F.A. Davis Company ET - 7 DB - Nursing Central DP - Unbound Medicine ER -