SpO2
Pronunciation: S-P-O-two
Also written as: SpO2 — peripheral oxygen saturation
Pulse oximetry measurement of oxygen saturation in peripheral blood.
Full Definition
SpO2 represents the percentage of hemoglobin saturated with oxygen as measured non-invasively by pulse oximetry. This continuous monitoring technique uses light absorption properties to estimate arterial oxygen saturation without requiring blood sampling. Normal SpO2 values range from 95-100% in healthy individuals. Respiratory therapists rely on SpO2 monitoring to assess oxygenation status, guide oxygen therapy, and detect respiratory deterioration, though it should be correlated with clinical assessment and arterial blood gas analysis when indicated.
Usage
Usage note: The subscript '2' should be formatted as subscript when possible; distinguish from SaO2 (arterial oxygen saturation).
In Context
- "The patient's SpO2 dropped to 88% on room air, prompting initiation of supplemental oxygen." — Nursing assessment note
- "Continuous SpO2 monitoring revealed intermittent desaturation during sleep." — Sleep study report