What approximate FiO₂ is delivered by a nasal cannula at 2 L/min?

Prepare for the NCLEX Oxygenation Test with flashcards and multiple choice questions. Each question comes with detailed explanations and hints. Ace your exam!

Multiple Choice

What approximate FiO₂ is delivered by a nasal cannula at 2 L/min?

Explanation:
Nasal cannula oxygen delivers a small amount of oxygen by blending with room air, and the FiO2 increases by roughly 3–4% for each liter per minute of flow, up to about 6 L/min. Since room air is about 21% oxygen, at 2 L/min the FiO2 is around 21% + (2 × 4%) ≈ 29%, which falls in the commonly cited range of about 24–28%. So the best approximation is 24–28%. Higher FiO2 values (like 40–45% or 60–65%) require more intensive delivery methods, such as a mask or high-flow system.

Nasal cannula oxygen delivers a small amount of oxygen by blending with room air, and the FiO2 increases by roughly 3–4% for each liter per minute of flow, up to about 6 L/min. Since room air is about 21% oxygen, at 2 L/min the FiO2 is around 21% + (2 × 4%) ≈ 29%, which falls in the commonly cited range of about 24–28%. So the best approximation is 24–28%.

Higher FiO2 values (like 40–45% or 60–65%) require more intensive delivery methods, such as a mask or high-flow system.

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