Definition:
Polychromasia is the occurence of erythrocytes with a striking bluish color in the blood film. Immature erythrocytes with a high RNA content are responsible for this phenomenon. Polychromatophilic erythrocytes are usually identical to reticulocytes.
Occurrence:
Polychromasia occurs in accelerated erythropoiesis, for example in severe blood loss or hemolysis.
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