Free NCLEX RN Practice Questions Practice Question
A client is receiving oxygen therapy at 3 L/min per nasal cannula. Which of the following fraction of inspired oxygen (FiO2) measurements does the nurse expect that the client is receiving?
Correct Answer: C
Rationale: In oxygen therapy, the fraction of inspired oxygen (FiO2) can be estimated based on the flow rate. For nasal cannula use, each liter per minute typically increases the FiO2 by approximately 4%. Therefore, at 3 L/min, the calculation would be: 21% (room air) + (3 L/min x 4%) = 21% + 12% = 33%. This rounds to approximately 32%, making option C the most accurate.
Option A (24%) underestimates the FiO2 for 3 L/min. Option B (60%) suggests a much higher flow than nasal cannulas can provide. Option D (100%) is only achievable with a non-rebreather mask, not a nasal cannula.
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