therapeutic range
C2CEFR level
82/100Rarity: very rare
TechnicalRegister
The range of drug concentrations in the blood that is effective without being toxic.
We monitor lithium levels closely because its therapeutic range is very narrow.
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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