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

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TY - ELEC T1 - Alveolar/Arterial Gradient and Arterial/Alveolar Oxygen Ratio ID - 425247 Y1 - 2017 PB - 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 ER -