A nasal cannula delivers FiO2 in the 24–44% range when providing what flow range?

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Multiple Choice

A nasal cannula delivers FiO2 in the 24–44% range when providing what flow range?

Explanation:
Nasal cannula is a low-flow delivery method, so the oxygen concentration you deliver isn’t fixed but rises as the flow increases. In practice, FiO2 climbs by roughly 3–4% for each additional liter per minute of flow, giving about 24% at a flow of 1 L/min and about 44% at 6 L/min. Therefore, the full 24–44% FiO2 range occurs when you deliver oxygen at about 1–6 L/min. Flows lower than that provide only the lower end of the range, while flows higher than about 6 L/min don’t substantially increase FiO2 because of air entrainment and fit limitations.

Nasal cannula is a low-flow delivery method, so the oxygen concentration you deliver isn’t fixed but rises as the flow increases. In practice, FiO2 climbs by roughly 3–4% for each additional liter per minute of flow, giving about 24% at a flow of 1 L/min and about 44% at 6 L/min. Therefore, the full 24–44% FiO2 range occurs when you deliver oxygen at about 1–6 L/min. Flows lower than that provide only the lower end of the range, while flows higher than about 6 L/min don’t substantially increase FiO2 because of air entrainment and fit limitations.

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