Normal Fio2 Room Air

Fio2 p f ratio pao2 100 600 600 90 540 600 80 480 600 70 420 600 60 360 600 50 300 600 read more.

Normal fio2 room air. The only thing that has changed was the patient s inspiratory flow demand and how much that diluted the pure oxygen being delivered with the fio 2 of 21 found in room air. Everybody breathing room air 21 will have an pao2 100. Fio2 is defined as the concentration of oxygen that a person inhales. The air that we inhale on a day to day basis is made up of 21 of oxygen 78 of nitrogen and 1 of trace elements such as argon carbon dioxide neon.

A low pf ratio may be present if a person is suffering from severe health problems including but not limited to multiple organ dysfunction syndrome mods. Fio2 fraction of inspired oxygen value 0 no oxygen just room air 20 1 l min 24 2 l. Nasal cannula we assume that the fraction of oxygen that is inspired above the normal atmospheric level or 20 increases by 4 for every additional liter of oxygen flow administered. Everybody breathing 100 oxygen via nrb will have an pao2 500.

Oxygen enriched air has a higher fio 2 than 0 21. P f ratio 100 0 2 500. Everybody breathing room air 21 will have an pao2 100. Hospital grade oxygen found in a medical facility can reach 99 fio2.

P f ratio 100 0 2 500. From these ranges most oxygen concentrators can deliver 90 fio2. For a nasal cannula. 90 0 40 p f ratio 225.

As a generalization. F represents the fio 2 the fraction percent of inspired oxygen that the patient is receiving expressed as a decimal 40 oxygen fio 2 of 0 40. In liters min. This pf ratio calculator also a pao2 fio2 ratio calculator is designed to determine a patient s respiratory efficiency.

We can never accurately know what the fio 2 of a patient is unless we accurately know what their peak inspiratory flow is or we are delivering high flow oxygen at a. Pao2 fio2 p represents pao 2 arterial po2 from the abg. Pao 2 90 on 40 oxygen fio 2 0 40. How to calculate the p f ratio.

Its primary purpose is as a clinical indicator of hypoxemia an abnormally low level of oxygen in the blood. The natural air we breathe contains 21 oxygen 21 fio2 and 79 nitrogen at all times with some trace gases. So now you can figure out the max pao2 on any fio2. The fio2 coming from a portable oxygen concentrator can vary anywhere from 90 96 fio2.

We do not need a lot of it under normal circumstances with 0 21 being the fraction of inspired oxygen fio2 of room air. Everybody breathing 100 oxygen via nrb will have an pao2 500. P divided by f p f ratio. So now you can figure out the max pao2 on any fio2.