Oxygen therapy is vital in treating respiratory conditions. But how do you know how much oxygen a patient is getting? The answer lies in FiO₂. It tells us the inhaled oxygen concentration—not just the flow rate. Here’s an easy-to-use FiO₂ calculator to give you a quick look at how oxygen flow (in liters per minute) can change the fraction of inspired oxygen (FiO₂):
Other Factors May Affect FiO2
1. Device Type: Different oxygen devices deliver different oxygen levels; some mix in room air, lowering oxygen concentration.
2. Mask Fit: A loose mask lets room air in, reducing the oxygen you breathe.
3. Breathing Pattern: Slow, deep breaths bring in more oxygen; fast or shallow breaths reduce oxygen intake.
4. Room Air Mixing: More room air mixed with oxygen lowers the overall oxygen level you get.
5. Delivery Mode: Continuous flow gives steady oxygen; pulse flow delivers oxygen only when you inhale, affecting how much oxygen you receive.
