FIO ₂

FIO ₂

These two graphs explain the percentage of nasal cannula oxygen in the inspired volume, and the minimal effect that O2 purity has on FIO2. Also this is provided with the scientific source that has produced the statistics.

Nasal cannula oxygen represents only 3-7% of inspired volume

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RR 20-30/min, 2-3 LPM, I:E 1:2

O₂ purity has little influence on FIO₂

OXYGEN SOURCE	ROOM AIR	LIQUID OXYGEN (2LPM)
FIO ₂
O₂ purity	21%	99,6%
nasal cannula FIO₂ equation	21% x 500ml = 105ml	99,6% x 33ml = 33ml 21% x (500-33)ml = 98ml 131ml
Calculated FIO	105/500 = 21%	131/500 = 26.2%

Nasal cannula FIO₂ equation. Clinical Application of Blood Gases. Shapiro BA. 5th ed RR/20min, I:E, inspiration 2s, 2 LPM = 33ml/s105/500 = 21%