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Aa Gradient Calculator — Free Online Tool
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Aa Gradient Calculator

Calculate Alveolar-arterial (A-a) oxygen gradient from ABG results

Clinical Formula: The A-a gradient is calculated as $\text{A-a Gradient} = PAO_2 - PaO_2$, where alveolar oxygen $PAO_2 = (FIO_2 \times (760 - 47)) - \frac{PaCO_2}{0.8}$. Enter your arterial blood gas (ABG) parameters below.
ABG Parameters Input

Calculation Results

⚠️ Not medical advice. For educational and clinical decision support only. Always correlate A-a gradient with clinical presentation and patient age.

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