Two Cases of Familial Erythrocytosis With Increased Erythropoietin Activity in Plasma and Urine

Abstract
Two brothers with familial erythrocytosis born to parents of a consanguinous marriage are described. Two other siblings were unaffected. There was a marked increase in erythropoietin concentration in both the plasma and urine, suggesting that a congenital defect led to erythropoietindependent polycythemia. Other causes of polycythemia were excluded.

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