What is considered the normal range for oxygen saturation levels?

• A. 85% to 90%
• B. 90% to 95%
• C. 95% to 100%
• D. 100% to 105%

Answer: (C)

Oxygen saturation levels are an essential vital sign that measures the amount of oxygen bound to hemoglobin in the blood. The normal range for oxygen saturation levels in healthy individuals is typically between 95% and 100%. This range indicates that a sufficient amount of oxygen is being transported throughout the body, ensuring that tissues and organs receive the oxygen they need for optimal function.

Oxygen saturation levels below 95% can signal hypoxemia, where the body may not be receiving adequate oxygen, potentially necessitating medical evaluation or intervention. While levels above 100% are not physiologically possible, as hemoglobin can only carry a finite amount of oxygen, reaching saturation of 100% can occur in optimal conditions, such as during supplemental oxygen therapy. Therefore, the correct answer reflects the standard physiological norm for healthy oxygen transport in the bloodstream.