Normal oxygen saturation (SpO2) is typically within which range?

• A. 92-96%
• B. 94%-100%
• C. 96-99%
• D. 100%-105%

Answer: (B)

SpO2 represents how much oxygen is bound to hemoglobin in arterial blood, and in healthy adults it’s typically in the mid-to-upper 90s up to 100 percent. The range that best fits normal, everyday physiology is 94-100%, because most people fall within this span and it provides a practical threshold for adequate oxygenation in clinical care. Values below this range can indicate hypoxemia and may prompt assessment or intervention, depending on the patient’s condition and baseline. The other options are less accurate: 100-105% isn’t physiologically achievable with standard pulse oximetry; 96-99% is too narrow and excludes some normal readings around 94-95%; and 92-96% includes values like 92% that would often be considered below normal in many adults.