Erythrocytosis - 赤血球増多症 -

1) Hemoconcentration
・Dehydration
・Endotoxins shock

2) Physiologic erythrocytosis (Splenic contraction)

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3) Increased total erythrocyte mass

3-1) Primary erythrocytosis
・Polycythemia Rubra Vera : PRC

3-2)  Secondary appropriate erythrocytosis
・Cardiac failure
・Chronic pulmonary disease 
・Hyperthyroidism

3-3) Secondary inappropriate erythrocytes 
・Renal neoplasms 
・Non-renal neoplasm (hepatoma, hepatoblastoma, schwannoma, or leiomyosarcoma)

※In one study, about 45% of 131 hyperthyroid cats had an erythrocytosis (Hct values from 38% to 57%).