faecal occult blood
C2CEFR level
90/100Rarity: very rare
TechnicalRegister
Small amounts of blood in the stool that are not visible to the eye but detectable on testing.
A positive faecal occult blood result from screening prompted a diagnostic colonoscopy.
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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