What does FiO2 stand for?

FiO2 stands for "Fraction of inspired oxygen." This term is used to describe the percentage of oxygen that is present in the air that is inhaled by a patient. In clinical settings, especially in emergency medicine and respiratory care, it is crucial to accurately measure and manage the concentration of oxygen a patient receives. Understanding FiO2 is essential for providing appropriate oxygen therapy, as it helps determine the adequacy of a patient’s respiratory function and the need for supplemental oxygen. The use of the term "inspired" specifically refers to the oxygen that enters the lungs with each breath, distinguishing it from other potential types of oxygen present in the body that might not be related to the air being inhaled. Other choices, while they may include the word "oxygen," do not correctly define this important concept in respiratory physiology.