serum creatinine
C1CEFR level
75/100Rarity: rare
TechnicalRegister
A waste product of muscle metabolism measured in the blood as a marker of kidney function.
Her serum creatinine has doubled since admission, which is concerning for worsening renal function.
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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