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Dyscrasia (plural: dyscrasias) was used historically in medicine to refer to an imbalance of the four bodily humors 1. It is now used as a synonym for disease, and is only found as part of the terms "blood dyscrasia" or "plasma cell dyscrasia".
Blood dyscrasia refers to any disease of the blood, usually those in which the primary abnormality is of the blood cells.
Plasma cell dyscrasia is used as a synonym for paraproteinaemias or monoclonal gammopathies.
- 1. William Alexander Newman Dorland. Dorland's Illustrated Medical Dictionary. (2018) ISBN: 9781416023647