Polycythemia is best described as?

• A. A slow-growing blood cancer with excessive red blood cell production
• B. A slow-growing blood cancer with excessive red blood cell production and often increased white blood cells and platelets
• C. A deficiency in iron
• D. A deficiency in oxygen delivery due to lungs

Answer: (B)

Polycythemia vera is a myeloproliferative neoplasm in which the bone marrow chronically overproduces blood cells, especially red blood cells. Because it is a clonal, slow-growing cancer, you often see not only a high red cell mass but also elevated white blood cells and platelets. That combination—excess red cells with sometimes increased leukocytes and platelets—fits polycythemia vera best, distinguishing it from iron deficiency (which lowers red cells) and from hypoxia-driven conditions related to lung function (which are not cancers).