Difficulty: Medium
Average Score: 80%
Simulated
A nurse is caring for a client who is receiving oxygen at $2 \mathrm{~L}/\min$ via a nasal cannula. The nurse recognizes the client is receiving which of the following inspired oxygen concentration?
Correct answer
D
Rationale
The correct answer is D (28%). To calculate the inspired oxygen concentration, use the formula: %O2 = (L/min of oxygen × 4) + 21. So, %O2 = (2 × 4) + 21 = 28%. This formula accounts for the estimated oxygen concentration delivered by a nasal cannula. The other choices are incorrect because they do not reflect the accurate calculation based on the oxygen flow rate and the device being used.