Normal pulse oximetry is generally considered greater than what percentage?

• A. Greater than 90%
• B. Greater than 92%
• C. Greater than 95%
• D. Greater than 97%

Answer: (C)

Pulse oximetry measures how much hemoglobin in the blood is carrying oxygen (SpO2). In healthy people, a normal SpO2 typically ranges from about 95% to 100%. So, readings above 95% are considered normal, which is why this option is the best choice. Values in the 90s can occur and may be acceptable in some situations, but they don’t define the standard normal lower bound. Readings below around 90% indicate hypoxemia and warrant evaluation. Remember that readings can be affected by factors like poor perfusion, motion, or nail polish, so interpret the value in the clinical context.