Oxygen Saturation

What Is Oxygen Saturation?

Oxygen saturation (SpO2) quantifies the proportion of hemoglobin in arterial blood that is bound to oxygen, reflecting the efficiency of pulmonary gas exchange. This measurement is typically obtained non-invasively via a pulse oximeter, which is often applied to a patient's finger or earlobe. Not to be confused with arterial blood gas (ABG) analysis, which provides a more comprehensive assessment of blood gases. In the context of EMS operations, accurate monitoring of oxygen saturation is critical during patient assessment and triage, particularly in respiratory distress scenarios.

Why Oxygen Saturation Matters on the Fireground

Oxygen saturation monitoring is essential for EMS providers to evaluate a patient's respiratory status and the effectiveness of oxygen delivery to vital organs. This information is crucial for making informed decisions regarding oxygen therapy and other medical interventions. Clear definitions improve handoffs, documentation clarity, and team alignment when multiple providers must prioritize tasks under time pressure.