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. …

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.

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 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 …

Jan 6, 2026 · 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.

Aa gradient, short for alveolar-arterial gradient, serves as a method of differentiation between the causes of hypoxemia in a patient. The hypoxemia definition is quite straightforward: it's low …

The Alveolar-arterial gradient is used to evaluate causes of hypoxemia. Enter values and press 'calculate' button to calculate the gradient between the alveolar and arterial oxygen tensions.

Calculate the alveolar-arterial (A-a) gradient to assess oxygenation efficiency and help determine the cause of hypoxemia.