Which statement best describes cell production in Polycythemia Vera?

Which statement best describes cell production in Polycythemia Vera?

• A. Excessive production of red blood cells, white blood cells, and platelets
• B. Decreased production of red blood cells
• C. Increased production of platelets only
• D. Decreased production of white blood cells

Answer: (A)

Polycythemia vera is a myeloproliferative neoplasm where a clone of hematopoietic stem cells drives increased production of all three myeloid lines. In PV, red blood cells are expanded (often with a very high hematocrit), but white blood cells and platelets are also increased. This broad overproduction results from constitutive JAK2 signaling in the marrow, which pushes proliferation independent of normal regulators like erythropoietin. So the statement describing excessive production of red blood cells, white blood cells, and platelets best fits polycythemia vera. The other options describe decreased production or a single-line increase, which does not match the tri-lineage overproduction seen in PV.

Polycythemia vera is a myeloproliferative neoplasm where a clone of hematopoietic stem cells drives increased production of all three myeloid lines. In PV, red blood cells are expanded (often with a very high hematocrit), but white blood cells and platelets are also increased. This broad overproduction results from constitutive JAK2 signaling in the marrow, which pushes proliferation independent of normal regulators like erythropoietin. So the statement describing excessive production of red blood cells, white blood cells, and platelets best fits polycythemia vera. The other options describe decreased production or a single-line increase, which does not match the tri-lineage overproduction seen in PV.