Pulse Oximetry

What Is Pulse Oximetry?

Pulse oximetry is a noninvasive technique that quantifies peripheral oxygen saturation (SpO2) and pulse rate through a sensor typically affixed to a digit or earlobe. Not to be confused with arterial blood gas analysis, which requires blood sampling, pulse oximetry provides continuous, real-time data on oxygenation status. This method is integral to the START triage system, allowing EMS personnel to quickly assess respiratory function and tailor oxygen therapy during patient management. In EMS contexts, it is commonly framed alongside structured communication and triage concepts such as START (Simple Triage and Rapid Treatment) or SALT (Sort, Assess, Lifesaving interventions, Treatment/Transport) as shared terminology.

Why Pulse Oximetry Matters on the Fireground

The ability to rapidly evaluate oxygen saturation is crucial for the early identification of hypoxemia, which can significantly impact patient outcomes. Effective use of pulse oximetry enhances the precision of oxygen delivery, thereby supporting patient stabilization and ongoing monitoring in pre-hospital settings. Clear definitions improve handoffs, documentation clarity, and team alignment when multiple providers must prioritize tasks under time pressure.