Side-by-side comparison helps you choose the right calculator for a specific clinical question.
Clinical
Estimate PaO₂ from pulse oximetry SpO₂ readings using the oxygen-hemoglobin dissociation curve approximation.
Formula
Approximation based on the oxygen-hemoglobin dissociation curve (Severinghaus equation)
Inputs
Clinical
Calculate the alveolar-arterial oxygen gradient to evaluate the cause of hypoxemia. Differentiates lung pathology from hypoventilation.
Formula
A-a gradient = [FiO₂ × (Patm − 47) − PaCO₂/0.8] − PaO₂
Inputs