Professional
Technical
In the Industry Vocabulary Test
FiO2
Pronunciation: F-I-O-two
Also written as: FiO2 — Fraction of Inspired Oxygen
Fraction of Inspired Oxygen; the concentration of oxygen in the air mixture delivered to a patient.
Full Definition
Fraction of Inspired Oxygen (FiO2) represents the percentage of oxygen in the gas mixture a patient breathes, expressed as a decimal from 0.21 (room air) to 1.0 (100% oxygen). Respiratory therapists carefully monitor and adjust FiO2 based on arterial blood gas results and patient condition. The goal is to provide adequate oxygenation while minimizing oxygen toxicity risks associated with prolonged high concentrations.
Usage
Usage note: The subscript '2' should be formatted as subscript when possible; capitalize the acronym.
In Context
- "The patient's FiO2 was weaned from 0.60 to 0.40 following improvement in blood gas values." — Respiratory therapy progress note
- "Room air has an FiO2 of 0.21, equivalent to 21% oxygen." — Patient education material
Also known as
oxygen concentration
Don't confuse with
SpO2
PaO2