SpO2 is the percentage of oxygen-saturated hemoglobin in the blood, measured with a pulse oximeter.

FiO2 is the fraction of inspired oxygen or the percentage of oxygen that a patient inhales.

Are SpO2 and FiO2 related?

Both values are used together to evaluate respiratory function. FiO2 measures inhaled oxygen, while SpO2 measures oxygenation in the bloodstream.

Difference between SpO2 and FiO2 | Legacy Cables Solutions LLC

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