Pulse Oximetry SpO2 ↔ PaO2 Converter
Estimate arterial oxygen partial pressure (PaO2) from oxygen saturation (SpO2) using the Severinghaus curve model.
A quick bedside correlation for pulse-oximetry saturation values:
- SpO2 90% ≈ PaO2 60 mmHg (Hypoxemia boundary)
- SpO2 80% ≈ PaO2 50 mmHg
- SpO2 70% ≈ PaO2 40 mmHg (Severe distress)
The oxygen-hemoglobin dissociation curve is sigmoidal (S-shaped). At high saturation levels (95-100%), large drops in PaO2 cause only tiny drops in SpO2. However, below 90%, the curve becomes extremely steep, meaning small changes in oxygen levels cause dangerous, rapid desaturation.
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