A patient has an increased red count,hemoglobin,and hematocrit.Which of the following features points to secondary polycythemia over polycythemia vera?

Question

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Decreased arterial oxygen saturation is characteristic of secondary polycythemia.Arterial oxygen saturation is normal in polycythemia vera.Decreased arterial oxygen saturation leads to hypoxia,resulting in increased production of erythropoietin.This stimulates the bone marrow to increase red cell production (erythroid hyperplasia),also found in polycythemia vera.This results in an increase in red cell mass,again also found in polycythemia vera,as is an increased white count.

A Patient Has an Increased Red Count,hemoglobin,and Hematocrit