In patients with polycythemia vera, the level of erythropoietin is typically?

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Multiple Choice

In patients with polycythemia vera, the level of erythropoietin is typically?

Explanation:
Polycythemia vera features a clonal proliferation of red blood cells driven by a JAK2 mutation, so erythropoiesis occurs independently of erythropoietin stimulation. The resulting increased red cell mass lowers the body's need for EPO, and the kidneys respond with decreased production of erythropoietin. That's why erythropoietin levels are typically reduced in PV. This contrasts with secondary polycythemia, where hypoxia or other factors drive increased EPO.

Polycythemia vera features a clonal proliferation of red blood cells driven by a JAK2 mutation, so erythropoiesis occurs independently of erythropoietin stimulation. The resulting increased red cell mass lowers the body's need for EPO, and the kidneys respond with decreased production of erythropoietin. That's why erythropoietin levels are typically reduced in PV. This contrasts with secondary polycythemia, where hypoxia or other factors drive increased EPO.

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