What does FiO2 stand for?

What does FiO2 stand for?

• A. Oxygen saturation measured by pulse oximetry.
• B. The percentage of total gas in the inspired mixture.
• C. The rate at which oxygen is delivered in liters per minute.
• D. Fraction of Inspired Oxygen.

Answer: (D)

FiO2 is the fraction of inspired oxygen—the portion of the gas a patient breathes that is oxygen. It’s written as a decimal (for example, 0.21 in room air) or as a percentage (about 21%). This measures how concentrated the inhaled gas is in oxygen, which is different from oxygen saturation in the blood (SpO2) or from how fast oxygen is flowing (the delivery rate). While you could describe it as the percentage of the inspired gas that is oxygen, the standard term used is Fraction of Inspired Oxygen.

FiO2 is the fraction of inspired oxygen—the portion of the gas a patient breathes that is oxygen. It’s written as a decimal (for example, 0.21 in room air) or as a percentage (about 21%). This measures how concentrated the inhaled gas is in oxygen, which is different from oxygen saturation in the blood (SpO2) or from how fast oxygen is flowing (the delivery rate). While you could describe it as the percentage of the inspired gas that is oxygen, the standard term used is Fraction of Inspired Oxygen.