Definitions for polycythemia
This page provides all possible meanings and translations of the word polycythemia
a disorder characterized by an abnormal increase in the number of red blood cells in the blood
A rare disorder in which the bone marrow produces an abnormally large amount of blood cells, often red blood cells.
Polycythemia is a disease state in which the proportion of blood volume that is occupied by red blood cells increases. Blood volume proportions can be measured as hematocrit level. It can be due to an increase in the number of red blood cells or to a decrease in the volume of plasma. Polycythemia is sometimes called erythrocytosis, but the terms are not synonymous because polycythemia refers to any increase in red blood cells, whereas erythrocytosis only refers to a documented increase of red cell mass. The emergency treatment of polycythemia is by venesection, the removal of blood from the circulation. Depending on the underlying cause, venesection may also be used on a regular basis to reduce the red blood cell count. Cytostatics are sometimes used if venesection is ineffective or contraindicated.
U.S. National Library of Medicine
An increase in the total red cell mass of the blood. (Dorland, 27th ed)
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"polycythemia." Definitions.net. STANDS4 LLC, 2014. Web. 28 Jul 2014. <http://www.definitions.net/definition/polycythemia>.