The key factor to distinguish relative and absolute polycythemia is that a relative polycythemia is due to:

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Relative polycythemia is characterized by an increase in red blood cells because of a decrease in the amount of fluid in the blood (plasma). This occurs because the total red blood cell count remains constant, but the amount of fluid in the blood decreases, leading to a relative increase in the percentage of red blood cells.

The Key Factor to Distinguish Relative and Absolute Polycythemia Is