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The respiratory calculations provide calculations based upon patient demographic information provided in the fields above. Some calculations require additional patient data, for which fields are provided within the calculation. As with all clinical decision support tools, ultimately use clinical judgement when considering these results.

• Some calculations may have important additional information which can be shown using the question mark icon

Contributing to this calculator

Use the discussion page to leave feedback about the calculator. To contribute more substantially, see the calculators guide to learn about the process to get developer access.

The respiratory calculations are powered by the patients, bodyComposition and respiratory modules.

PaO₂ (predicted)

A-a O₂ gradient

A-a O₂ gradient (predicted)

Rapid shallow breathing index (RSBI)

Weight-based tidal volume