Oxygen FAQ

Up to date, expert answers to frequently asked questions (FAQ) about oxygen supply systems, respiratory care and pulse oximetry written by OCC & collaborators.

Non-rebreather facemask

  • Most are not considered reusable per manufacturer specifications 
  • Check with the manufacturer specification and clinical guidelines to determine if reuse is safe
  • Steps for disinfection must be closely adhered to and may be manufacturer specific 
  • Some reusable devices (e.g. some ventilator circuits) may have a finite lifespan (e.g. a predefined number of sterilizing cycles)
  • Reusability of respiratory care devices is often debated and may vary based on local/national practice guidelines and regulations   

Click here to review WHO tips for cleaning and disinfection of respiratory equipment 

Additional resources:

 

Estimated Fraction of Inspired Oxygen (FiO2)

Oxygen Device
O2 Flow (L/min)
FiO2

Nasal Cannula

1

0.24

-

2

0.28

-

3

0.32

-

4

0.36

-

5

0.40

Simple Facemask

6-10

0.44-0.50

Non-Rebreather Mask with Reservoir

(reservoir must be fully inflated)

10-20

Approx 0.6-0.8

At RR ~20 & Tidal Volume ~500

20 LPM flow = ~60% FiO2

30 LPM flow = ~70% FiO2

40 LPM flow = ~80% FiO2 (Farias et al).

The values represent estimates of FiO2. Actual FdO2 (delivered O2 concentration) is dependent on multiple factors including oxygen supply quality, patient’s minute ventilation and inspiratory flow rate. One general estimation rule is using oxygen flow rate: FiO2 =0.21 + 0.03 x oxygen flow rate in L/min (Frat et al).

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