An oxygen saturation of 92% on room air is most consistent with which level of oxygenation?

• A. Normal oxygenation
• B. Mild hypoxemia
• C. Hyperoxia
• D. Severe hypoxemia

Answer: (B)

SpO2 is how much hemoglobin is carrying oxygen, measured on room air. In healthy individuals, oxygen saturation on room air typically runs about 95–100%. A reading of 92% on room air indicates reduced oxygenation, which fits with mild hypoxemia. It’s not normal oxygenation, and it isn’t severe hypoxemia (that is usually well below 90%, often in the 80s or lower). Hyperoxia means excess oxygen levels and is not diagnosed from a 92% saturation on room air; hyperoxia would generally be seen with very high oxygen exposure or readings closer to 100% under supplemental oxygen, not at 92% on room air. Roughly, 92% on room air often corresponds to a PaO2 around 60 mmHg, indicating impaired oxygen transfer but not an immediately life-threatening level.