A normal pulse oximetry (SpO2) reading on room air for most adults is:

Explanation

Normal SpO2 on room air is 95-100% for most adults; 90-94% may indicate mild hypoxia and warrants closer monitoring; below 90% is significant hypoxia requiring immediate evaluation and possible supplemental oxygen. Some chronic COPD residents have a baseline of 88-92% and may have a physician-set lower target to avoid suppressing hypoxic drive. Report values outside the resident's individualized parameters to the nurse. Probe placement, motion, nail polish, cold extremities, and poor perfusion can falsely lower the reading.