An abnormal increase in immature red blood cells (reticulocytes) in the bloodstream, usually as a response to blood loss or hemolysis.
From Greek erythro- (red) + neo- (new) + cyt- (cell) + -osis (condition). Medical term combining elements describing new red cells flooding into circulation.
When you donate blood, your bone marrow kicks into overdrive and releases immature red blood cells into circulation—erythroneocytosis—as your body frantically tries to replace what you lost within hours.
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