transient polycythemia

Transient polycythemia is a temporary increase in red blood cells in the circulation. This can occur when a large number of red blood cells suddenly enter the bloodstream from storage. This condition differs from absolute polycythemia, which involves an increase in the total mass of red blood cells, and relative polycythemia, which is due to a loss of blood plasma. Transient polycythemia resolves once the underlying cause is addressed.1

Polycythemia, in general, is characterized by an abnormal increase in red blood cells and hemoglobin, leading to thickened blood and an increased risk of clot formation. This condition often arises in response to the body's increased demand for oxygen, such as at high altitudes or due to impaired lung function.21