What is the normal range of oxygen saturation?

What is the normal range of oxygen saturation?

• A. 85-90%
• B. 91-94%
• C. 95-98%
• D. 99-100%

Answer: (C)

Oxygen saturation shows how much of the hemoglobin is carrying oxygen. In healthy adults breathing room air at sea level, SpO2 values are typically in the mid to high 90s. The range 95-98% fits this common expectation, capturing normal resting oxygenation while avoiding the lower end that would indicate hypoxemia (under about 90% is generally considered concerning). While some people may reach 99-100% in certain situations, 95-98% is a widely used, practical standard for normal oxygen saturation. So, this range best reflects normal oxygenation in a healthy adult.

Oxygen saturation shows how much of the hemoglobin is carrying oxygen. In healthy adults breathing room air at sea level, SpO2 values are typically in the mid to high 90s. The range 95-98% fits this common expectation, capturing normal resting oxygenation while avoiding the lower end that would indicate hypoxemia (under about 90% is generally considered concerning). While some people may reach 99-100% in certain situations, 95-98% is a widely used, practical standard for normal oxygen saturation. So, this range best reflects normal oxygenation in a healthy adult.