P/F ratio
C2CEFR level
97/100Rarity: very rare
TechnicalRegister
The ratio of arterial oxygen tension to the fraction of inspired oxygen, used to grade the severity of hypoxaemic respiratory failure.
With a P/F ratio of 95 she met the criteria for severe ARDS.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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