Oxygen & RespiratoryJanuary 12, 2026·5 min read
By the CIRRUS Editorial Team — how we write and source this
Pulse dose vs. continuous flow oxygen: which prescriptions call for which
The two delivery methods aren't interchangeable, and the difference explains why some patients can't use certain portable units.
Continuous flow delivers a steady stream of oxygen regardless of your breathing pattern — simple, reliable, and necessary for patients who breathe too shallowly or irregularly to reliably trigger a pulse-dose sensor.
Pulse dose instead senses the start of an inhalation and delivers a short burst of oxygen timed to it, conserving oxygen that would otherwise be wasted during exhalation. This is what makes small portable concentrators possible — they don't need to produce anywhere near the continuous output a stationary unit does.
The catch: a prescription written for a specific continuous-flow rate doesn't translate directly to a pulse-dose setting number — they're different delivery mechanisms, and equivalence has to be confirmed clinically, typically with an oximetry check on the specific device, not assumed from the numbers alone.
This is also why not every portable concentrator suits every prescription. Higher continuous-flow-equivalent needs sometimes require a stationary unit at home, even if a portable one appeals for travel — an honest gap worth discussing with your physician rather than working around.
This article is general health information, not medical advice, and doesn’t replace evaluation by your own physician. Talk to a doctor about anything specific to your own diagnosis or treatment.