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Definition of Reticulocyte count
Medically reviewed by Min Clinic Staff | Updated: January 2026
Reticulocyte count: The number of reticulocytes (young red blood cells) circulating in blood, usually less than 1 percent of the total number of red blood cells. Elevation of the reticulocyte count above 1 percent (reticulocytosis) is a sign of rapid red blood cell production.