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.