Definition of Reticulocytosis

Reticulocytosis: An elevation in the number of reticulocytes (young red blood cells) in blood, a sign of unusually rapid red blood cell production. The number of reticulocytes is normally less than 1% of the total number of the red blood cells. A higher proportion (above 1%) constitutes reticulocytosis.


Last Editorial Review: 6/14/2012

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