<qa>  What is the name of the red blood cells that are temporary present in the blood circulation?Reticulocytes are immature red blood cells that are temporary present in the blood circulation. They are easily monitored on every automatic dosing machines. Nevertheless, among the dialysis population, they are seldom used and attempt to define a normal reticulocyte level, attesting a correct medullar response to the administrated EPO dose failed due to the timing of blood collection corresponding to the Nadir day of reticulocytosis. 