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. It is a useful …

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) / 4 + 4 is another …

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

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 mmHg – a …

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.

This A-a gradient calculator helps diagnose hypoxemia and its cause based on the difference between alveolar and arterial oxygen concentration.

Jul 24, 2025 · Calculate the Alveolar-Arterial Oxygen Gradient (A–a gradient) instantly for hypoxemia evaluation. Determine respiratory function using ABG values and the alveolar gas equation. What Is …

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): A-a …

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 clinical utility …