Answer is 94%. Critically sick patients frequently arrive with hypoxemia, which if treated improperly has the potential to cause serious injury.
It is a typical trait of critically ill hospitalized patients and, if not promptly and effectively treated, can cause significant morbidity and mortality. More than 60% of hypoxemic patients who are admitted to an intensive care unit eventually require invasive ventilation. The death rate for severely ill hypoxemic patients is 27%, and it can reach 50% in cases of severe hypoxemia. Hypoxemia is not defined by a particular SaO2 or PaO2 threshold. The normal ranges for SaO2 and PaO2 are 94–98% and 10.5–13.5 kPa, respectively obtained using pulse oximetry and arterial blood gas (which provides PaO2 and SaO2) (providing peripheral capillary oxygen saturation; SpO2).
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