FiO2 stands for the fraction of inspired oxygen. What is the typical FiO2 of room air?

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Multiple Choice

FiO2 stands for the fraction of inspired oxygen. What is the typical FiO2 of room air?

Explanation:
FiO2 is the fraction of inspired oxygen in the air we breathe. In normal room air at sea level, oxygen makes up about 21% of the gas, so the FiO2 is 0.21 (or 21%). The rest is mostly nitrogen and trace gases. The other listed values (0.50, 0.80, 1.00) represent oxygen concentrations used when delivering supplemental oxygen with devices, not room air.

FiO2 is the fraction of inspired oxygen in the air we breathe. In normal room air at sea level, oxygen makes up about 21% of the gas, so the FiO2 is 0.21 (or 21%). The rest is mostly nitrogen and trace gases. The other listed values (0.50, 0.80, 1.00) represent oxygen concentrations used when delivering supplemental oxygen with devices, not room air.

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