haptoglobin
C2CEFR level
99/100Rarity: very rare
TechnicalRegister
A plasma protein that binds free haemoglobin, whose depletion serves as a sensitive marker of intravascular haemolysis.
An undetectable haptoglobin in this jaundiced patient supports a haemolytic process.
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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