What is the percentage of FIO2 for a patient on 3 L/min delivered through a nasal cannula?

a. 32% c. 44%
b. 40% d. 50%

ANS: A
3 L/min ? 4 = 12 L/min + 20 = 32% FIO2. The flow is multiplied by 4 because for every 1 L/min of oxygen flowing to a nasal cannula the FIO2 increases by 4%. The 20 is the number that the flow multiplied by 4 is added to, in order to get the approximate FIO2.

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