The A-a O₂ Gradient assesses for degree of shunting and V/Q mismatch.

The Alveolar–arterial gradient (A- aO 2, [1] or A–a gradient), is a measure of the difference between the alveolar concentration (A) of oxygen and the arterial (a) concentration of oxygen. …

High gradients result from impaired diffusion or, more commonly, by ventilation-perfusion inequality of the "shunting" variety. A normal A-a gradient is less than 10 torr. The age (years) …

Jul 6, 2024 · A normal A–a gradient for a young adult non-smoker breathing air, is between 5–10 mmHg. For every decade a person has lived, their A–a gradient is expected to increase by 1 …

Jun 20, 2025 · Learn how to calculate and interpret the alveolar-arterial (A-a) gradient to assess oxygen transfer and identify causes of hypoxemia.

5 days ago · This page includes the following topics and synonyms: A-a Gradient, Alveolar-Arterial Oxygen Tension Difference, (A-a) PO2 difference, (A-a) DO2, Alveolar Oxygen Equation.

Helps diagnose hypoxemia and its cause based on the difference between alveolar and arterial oxygen concentration. In the text below the form there is more information on the formula used …

Clinical Use/Classification Clinical Use The A-a Gradient Evaluates the Degree of Shunting and V/Q Mismatch to Help Determine the Cause of Hypoxia Short Form (Assuming at Sea-Level): …

Jun 5, 2023 · The A-a gradient, or the alveolar-arterial gradient, measures the difference between the oxygen concentration in the alveoli and arterial system. The A-a gradient has important …

Oct 2, 2023 · It's a simple enough idea - you minus the arterial oxygen tension (in kPa or mmHg) from the alveolar oxygen tension and it tells you essentially how efficiently oxygen is moving …