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5 calculators
Respiratory physiology calculators for gas exchange assessment, oxygenation indices, and ventilator-based clinical ratios. The A-a oxygen gradient quantifies alveolar-arterial oxygen difference to evaluate ventilation-perfusion matching. The PaO₂/FiO₂ ratio and oxygen index assess ARDS severity and guide ventilator management. The ROX index predicts high-flow nasal cannula failure in hypoxaemic respiratory failure. The BODE Index integrates body mass, airflow obstruction, dyspnoea, and exercise capacity for COPD mortality prediction and transplant evaluation. These tools are most useful in critical care and pulmonology settings where objective oxygenation metrics complement clinical assessment of respiratory distress.
Every tool in this domain is linked below, each with its own formula, inputs, and interpretation notes. Starting from the clinical area instead of the subject? The same calculators are grouped on the specialties pages, the full alphabetical list collects everything in one place, and the comparison tool lines up three tools side by side.
Calculates the alveolar-arterial oxygen gradient to assess gas exchange abnormalities.
PulmonologyCalculates the Oxygen Index to assess severity of hypoxemic respiratory failure in mechanically ventilated patients.
PulmonologyCalculates the arterial oxygen partial pressure to inspired oxygen fraction ratio for assessment of hypoxemia and ARDS severity.
PulmonologyPredicts success of high-flow nasal cannula (HFNC) therapy in acute hypoxemic respiratory failure.
PulmonologyMultidimensional prognostic index for COPD based on Body mass index, airflow Obstruction, Dyspnea, and Exercise capacity. Predicts mortality and guides clinical decision-making including transplant evaluation.
Pulmonology