Reticulocytes aren't Ridiculous, They're RBCs

Reticulocytes are immature red blood cells (RBCs) made in the bone marrow and released into circulation, where they mature after a few days.

The percentage of reticulocytes in the blood increases when more RBCs are needed to replace blood loss or during recovery from anemia. The reticulocyte% will decrease if the bone marrow isn't functioning well or while anemia is persistent.

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