What is the minimum acceptable level of oxygen saturation (SaO2) in a healthy individual?

The minimum acceptable level of oxygen saturation (SaO2) in a healthy individual is typically considered to be around 95%. This threshold reflects the point at which the body is adequately oxygenated to meet its physiological needs. Below this level, especially as saturation drops into the lower 90s, there may be a risk of hypoxemia, which can lead to various symptoms and complications.

In clinical practice, maintaining oxygen saturation at or above 95% is crucial for ensuring adequate oxygen delivery to tissues. This is particularly important for maintaining cellular metabolism and function. While some individuals may have slightly lower baseline levels, especially those with chronic respiratory conditions, for the general healthy population, 95% is the standard benchmark for sufficient oxygenation. This value is supported by guidelines from major health organizations and is frequently used in both emergency and critical care settings to assess and manage patient oxygenation levels effectively.