reticulocytosis

An increase in the number of circulating reticulocytes above the normal, which is less than 1% of the total number of red blood cells; it occurs during active blood regeneration (stimulation of red bone marrow) and in certain anemias, especially congenital hemolytic anemia. [reticulocyte + G. osis, condition]

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re·tic·u·lo·cy·to·sis -.sī-'tō-səs n, pl -to·ses -.sēz an increase in the number of reticulocytes in the blood typically following hemorrhage or accompanying hemolytic anemia

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n.

an increase in the proportion of immature red blood cells (reticulocytes) in the bloodstream. It is a sign of increased output of new red cells from the bone marrow.

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re·tic·u·lo·cy·to·sis (rə-tik″u-lo-si-toґsis) an increase in the number of reticulocytes in the peripheral blood.