What indicates an emergency when checking oxygen saturation?

A reading of 85% indicates an emergency when checking oxygen saturation. Normal oxygen saturation levels typically range from 95% to 100% for healthy individuals. When the saturation drops below 90%, it is often considered critically low, suggesting that the body may not be receiving enough oxygen. A reading of 85% reflects a significant deficiency in oxygen levels, which can lead to serious health complications such as hypoxia. This low level signifies an urgent need for medical evaluation and possible intervention to restore adequate oxygenation to the body.