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The word polycythemia indicates increased red blood cells, white blood cells, and platelets. Most of the time, it is used in place of erythrocythemia, or pure red blood cell increase, such as in secondary polycythemia.

The term polycythemia is reserved for the myeloproliferative disorder calledpolycythemia vera, in which all 3 peripheral blood cell lines can be increased.^{[1, 2]}

Erythrocytosis or erythrocythemia is a more specific term that is used to denote increased red blood cells.^[3]

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