Definition & Operational Usage of Pulse Oximetry
What Is Pulse Oximetry?
Measuring the percentage of hemoglobin saturated with oxygen using infrared light absorption across a capillary bed, typically on a fingertip.
⚠️ Operational Safety Warning:Carbon monoxide poisoning gives falsely high readings (100%) because the sensor cannot distinguish CO from O2 on hemoglobin.
Why Pulse Oximetry Matters on the Fireground
Provides immediate, non-invasive feedback on respiratory efficiency and the effectiveness of oxygen therapy.
Relevant NFPA Standards
- NREMT Standards: National Registry of Emergency Medical Technicians Practice Standards
- NFPA 455: Standard for Emergency Medical Services (EMS)
Field Procedures & Tactical Steps
- Ensure the patient's fingertip is clean and warm.
- Remove any dark nail polish if possible.
- Apply the probe and wait for a consistent pleth waveform.
- Read the SpO2 percentage and corresponding heart rate.
- Correlate the reading with the patient's actual work of breathing.
Common Context & Application
Standard vital sign taken on all medical and trauma patients.
Frequently Asked Questions about Pulse Oximetry
What is a normal reading?
94% to 100% on room air.
Why does cold affect it?
Vasoconstriction limits blood flow to the finger, causing poor signal.
Other Names for Pulse Oximetry
SpO2 monitoringoxygen saturation measurement
Pulse Oximetry may also appear in training materials, NFPA standards, or department SOPs as: SpO2 monitoring, oxygen saturation measurement.
Relevant Tools
Operational calculators related to Pulse Oximetry:
Category:EMS & Medical
— Patient care, assessment, interventions, triage, and EMS system terms commonly used by firefighter/medics.