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Test Findings

Elevated Red Cell Count

July 29th, 2019


Increased circulating red blood cells.
  • Causes of Erythrocytosis

  • Primary

  • Primary familial erythrocytosis (EPO receptor mutation)
  • Polycythaemia vera (JAK2 mutation)
  • Secondary

  • Chronic hypoxia - smoking, chronic lung disease, obstructive sleep apnoea, high altitude
  • Renal hypoxia - renal artery stenosis, polycystic kidney disease, post renal transplant
  • Drugs - testosterone, anabolic steroids, erythropoietin
  • Paraneoplastic syndrome (EPO-producing tumour)
  • Congenital - haemoglobinopathies, other mutations
  • Idiopathic
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