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Causes of erythrocytosis
| Primary erythrocytosis |
| Congenital |
| EPO receptor mutations |
| Acquired |
| Polycythemia vera |
| Secondary erythrocytosis |
| Congenital |
| Oxygen-sensing pathway mutations |
| High oxygen-affinity hemoglobin |
| Bisphosphoglycerate mutase deficiency |
| Acquired |
| EPO mediated |
| Hypoxia driven |
| Central hypoxic process |
| Local renal hypoxia |
| Pathologic EPO production |
| Tumours |
| Exogenous EPO |
| Drug associated |
| Idiopathic erythrocytosis |
EPO, erythropoietin.
