Which of the following is NOT a feature of secondary polycythemia?

In secondary polycythemia, the body produces an increased number of red blood cells in response to a stimulus, usually due to chronic hypoxia or other conditions that lead to increased erythropoietin production.

One of the hallmark features of secondary polycythemia is the increased erythropoietin level, which drives the production of more red blood cells. Additionally, conditions that lead to secondary polycythemia often result in an increased red cell mass as the body compensates for low oxygen levels.

Decreased oxygen saturation is commonly associated with secondary polycythemia, as the condition often arises in response to hypoxic environments or states, such as chronic lung disease or living at high altitudes.

In contrast, splenomegaly is less commonly associated with secondary polycythemia. While it can occur in various hematological conditions, it is generally not a feature specifically linked to secondary polycythemia itself, making it the correct response to the query.