Hi! I'm a new grad working on a peds med surg floor. Respiratory season has started strong here and we've been getting lots of kids on high flow oxygen. I have a question that nobody on my floor (nurses, RT's, residents) has been able to answer for me, so I was hoping someone here might know! Unfortunately we do not receive any formal training on how exactly the high flow equipment works so this may be part of the issue for me. I understand that with high flow flow you can control the FiO2 where with low flow NC you cannot as accurately. But with our high flow set up, we wean kids down to 3L and then once they can wean more we remove the high flow cannula and replace it with a low flow NC at 3 L. I don't understand the difference between 3L high flow and 3L low flow oxygen... They both hook up to the same oxygen flow meter and are at the same rate. High flow is humidified and heated and has the ability to attach in-line nebs, but aren't they getting the same concentration of oxygen? On our equipment I haven't been able to find anything that states the FiO2 or how to increase or decrease the FiO2 for the high flow, so I've been thinking the FiO2 correlates with the LPM of oxygen that the flow meter is adjusted to (like with low flow). But maybe this is where I'm getting stuck?