Exam Guide
Which Face Mask Delivers 90% Oxygen
Physiologic Needs · Question from the ATI PN Fundamentals 2023 Proctored Exam study set
Correct answer: Non-rebreather mask (with an oxygen reservoir bag)
Why this is the answer
A non-rebreather mask with a reservoir bag and one-way valves can deliver approximately 80–100% FiO2 at 10–15 L/min, the highest concentration achievable with a mask.
The bigger concept
Know the FiO2 range for each oxygen device. Nasal cannula delivers roughly 24–44% at 1–6 L/min, a simple face mask 40–60% at 5–8 L/min, a partial rebreather 60–75%, a Venturi mask precise 24–50%, and a non-rebreather 80–100% at 10–15 L/min. The non-rebreather's reservoir bag must stay inflated during inspiration; the PN/VN checks that the bag does not collapse and that the one-way valves are intact.
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