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.
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bone marrow failure syndrome
MONDO:0000159
familial polycythemia
MONDO:0001115
polycythemia neonatorum
MONDO:0001238
acquired polycythemia
MONDO:0002438
physiological polycythemia
MONDO:0004563
osteomyelitis
MONDO:0005246