alloimmunisation
C2CEFR level
95/100Rarity: very rare
TechnicalRegister
The development of antibodies against foreign red-cell or platelet antigens following transfusion or pregnancy.
Repeated transfusions had caused alloimmunisation, making compatible units difficult to find.
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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