Oxygen Flow Rate for Non-Rebreather Mask
Set the oxygen flow meter to 15 L/min when using a non-rebreather mask. This is the standard flow rate that delivers oxygen concentrations between 60% and 90% and is specifically recommended for trauma and emergency situations. 1
How to Adjust the Flow Meter
- Locate the flow meter attached to either the oxygen cylinder or wall oxygen outlet 1
- Align the center of the floating ball with the 15 L/min marking on the flow meter scale 1
- Verify the cylinder is not empty before connecting the mask—check the pressure gauge on portable cylinders 1
- Ensure proper connections at both ends of the oxygen tubing to prevent accidental connection to compressed air outlets instead of oxygen 1
Clinical Context and Monitoring
The 15 L/min flow rate is specifically designed for non-rebreather masks to:
- Maintain adequate reservoir bag inflation during patient inspiration 1
- Deliver high-concentration oxygen (60-90%) for critically ill or severely hypoxemic patients 1
- Prevent rebreathing of exhaled gases by ensuring sufficient flow 1
Target oxygen saturation should be 94-98% for most patients without risk of CO2 retention, or 88-92% for patients with COPD or other hypercapnic risk factors. 1, 2
Important Safety Checks
- Never use flow rates below 15 L/min with a non-rebreather mask, as this compromises oxygen delivery and may cause inadequate reservoir bag filling 1
- Verify you're using an oxygen outlet, not compressed air—air flow meters should be removed from wall sockets or covered when not in use 1
- Check mask fit to ensure proper seal, as delivered oxygen concentration depends on both flow rate and mask positioning 1
- Monitor the patient within minutes of initiating therapy and obtain arterial blood gases if critically ill or if saturation remains below target 2