What is the normal range for arterial oxygen saturation (SpO2) in a healthy adult?

Arterial oxygen saturation, measured as SpO2, reflects the percentage of hemoglobin binding sites occupied by oxygen in the blood. For a healthy adult, the normal range for SpO2 is typically between 95% and 100%. This range indicates sufficient oxygenation of the blood, essential for the body's cellular functions and overall health.

Values below 95% suggest potential hypoxemia, which may require clinical attention to ensure adequate oxygen supply to tissues. Conversely, readings over 100% are not physiologically achievable, as hemoglobin can only carry a certain amount of oxygen at atmospheric pressure. This physiological upper limit emphasizes the importance of maintaining SpO2 within the normal range for optimal bodily functions.