About: Nasal cannula oxygen FiO2 estimation
Evaluation of oxygenation status requires knowledge of the concentration of inspired oxygen. For patients on nasal cannula O2, this is difficult because the FiO2 from a nasal cannula varies widely .

Decisions are best made when the patient is on a known level of FiO2, such as when on face mask O2. However, when this is not feasible, this formula helps get a rough estimate of the FiO2 for a patient on nasal cannula.

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