FiO2 (fraction of inspired oxygen)

FiO2, or Fraction of Inspired Oxygen, refers to the percentage of oxygen in the air a person breathes. While normal air contains about 21% oxygen, in medical contexts, especially for patients needing extra help to breathe, the FiO2 can be increased using oxygen therapy. For example, if a person is receiving 40% oxygen, their FiO2 is 0.40. Understanding FiO2 is essential in healthcare, as it helps providers ensure patients receive the right amount of oxygen for their needs, which is crucial for maintaining proper bodily functions and overall health.