Disease or Syndrome
polycythemia Audio
pol·y·cy·the·mi·a
Subclass of:
Hematological Disease
Etymology:
Greek polys = many + kytos = vessel or cell + haima = blood + -ia = condition
Definitions related to polycythemia:
  • Abnormally high mass or concentration of red blood cells in the blood, either due to an increase in erythropoiesis or a decrease in plasma volume.
    NCI
    U.S. National Cancer Institute, 2021
  • An increase in the total red cell mass of the blood. (Dorland, 27th ed)
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • Increase in the total red cell mass of the blood.
    CRISP Thesaurus
    National Institutes of Health, 2006
  • Polycythemia is diagnosed if the red blood cell count, the hemoglobin level, and the red blood cell volume all exceed the upper limits of normal.
    Human Phenotype Ontology (HPO)
    The Human Phenotype Ontology Project, 2025
  • Polycythemia, abnormal increase in red blood cells (erythrocytes) and hemoglobin in the circulation, a situation that results in thickened blood, retarded flow, and an increased danger of clot formation within the circulatory system. The condition often results in an increase in the volume of...
    Encyclopedia Britannica
    Encyclopedia Britannica, Inc., 2025
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