fraction of inspired oxygen
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fraction of inspired oxygen (FiO2)
Etymology: L, frangere, to break, inspirare, to breathe in; Gk, oxys, sharp, genein, to produce
the proportion of oxygen in the air that is inspired.
fraction of inspired oxygenAbbreviation: Fio2
The concentration of oxygen in the inspired air, esp. that supplied as supplemental oxygen by mask or catheter.
See also: fraction