Calculating FiO2

[kcrd]

can someone tell me how to calculate FiO2 of oxygen through the nasal canula? If I ever learned this, I can't remember how to do it now. I know room air is 21%, and apparently 6L O2 is 40%, but I don't know how to calclate it.
thanks!
Katie

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[AJM]

For every 1 L/min of oxygen by NC, you add 3% to the estimated FiO2. So someone on 4L NC is getting about 33% FiO2 (21 + 12). Of course the FiO2 when you are talking about nasal canula is always an estimate, as people are variable in how much they breathe through their mouth. The actual FiO2 can vary quite a bit.

 

[kcrd]

thanks!