A patient needs 4 L/min of oxygen via nasal cannula. What approximate FiO2 (fraction of inspired oxygen) does this deliver?

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Multiple choice — select the best answer

A24%
B28%
C32%
D36%

✓ Correct answer: D. 36% Each liter per minute of nasal cannula oxygen increases FiO2 by approximately 4% above room air (21%). At 4 L/min: 21% + (4×4%) = 37% ≈ 36%. The formula is: FiO2 ≈ 21% + (4% × L/min flow rate).

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Topic: Nursing Fundamentals

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A patient needs 4 L/min of oxygen via nasal cannula. What approximate FiO2 (fraction of inspired oxygen) does this deliver?

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