SpO2 = oxygen saturation as measured by pulse oximeter
SaO2 = oxygen saturation as measured by blood analysis (e.g. a blood gas)
PaO2 = partial pressure of oxygen in the blood, as measured by blood analysis
SpO2 = oxygen saturation as measured by pulse oximeter
SaO2 = oxygen saturation as measured by blood analysis (e.g. a blood gas)
PaO2 = partial pressure of oxygen in the blood, as measured by blood analysis