Normal arterial oxygen saturation (SaO2) is in which range?

Normal arterial oxygen saturation (SaO2) is in which range?

• A. 98%
• B. 95-100%
• C. 95-99%
• D. 97-103%

Answer: (B)

SaO2 shows what fraction of hemoglobin binding sites in arterial blood are loaded with oxygen. In healthy individuals this is essentially full, typically within 95% to 100%. That range accounts for normal biological variation and measurement limits. Readings below about 90% indicate hypoxemia and may require assessment or intervention. Values cannot exceed 100%, so a range that goes above 100% isn’t physiologically possible.

SaO2 shows what fraction of hemoglobin binding sites in arterial blood are loaded with oxygen. In healthy individuals this is essentially full, typically within 95% to 100%. That range accounts for normal biological variation and measurement limits. Readings below about 90% indicate hypoxemia and may require assessment or intervention. Values cannot exceed 100%, so a range that goes above 100% isn’t physiologically possible.