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Human lungs are 2 liters in volume by average. So...

Average breath rate is 12 breaths per minute.

In one minute the patient would take in 24 liters of air. You are supplying 2 liters of pure oxygen + 4.8 liters from air (20% of the 24 liters (Percent oxygen in dry air)) = 6.8 liters of Oxygen per minute.

6.8 liters oxygen / 24 liters intake = 28.3% Oxygen

or you can look at the table given by the books at http://www.fpnotebook.com/ER/Procedure/LwFlwOxygn.htm

Nasal Cannula, Flow 0 liters per minute: 21% (Room Air), Flow 2 liters per minute: 29%

But I like the mathematical method. That's just me!

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13y ago

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How do you convert liters per minute in oxygen saturation into percentage?

Take example that we r providing 2L/min of oxygen to a ptHuman lungs are 2 liters in volume by average. So...Average breath rate is 12 breaths per minute.In one minute the patient would take in 24 liters of air. You are supplying 2 liters of pure oxygen + 4.8 liters from air (20% of the 24 liters (Percent oxygen in dry air)) = 6.8 liters of Oxygen per minute.6.8 liters oxygen / 24 liters intake = 28.3% Oxygen


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