What is the normal range for blood oxygen saturation (SPO2)?

The normal range for blood oxygen saturation (SpO2) is typically between 95% and 100%. This range indicates that the blood is effectively saturated with oxygen, which is essential for the body’s cellular functions. An SpO2 level below 95% may suggest that there is not enough oxygen in the bloodstream, which can lead to hypoxia and other health issues. Values above 100% are not physiologically possible, as they would suggest an over-saturation of oxygen in the blood, which can lead to toxicity. Thus, the correct answer reflects the expected physiological parameters for healthy individuals at sea level.