Question: what is the percentage of oxygen delivered?
Answer: Low-flow oxygen delivery systems consist of nasal cannula, nasal catheters, and transtracheal catheters. The standard nasal cannula delivers an FiO2 of 24-44% at supply flows ranging from 1-8 liters per minute (LPM). The formula is FiO2 = 20% + (4 × oxygen liter flow).