In vivo erythropoiesis during and after a program of hypertransfusion without rHuEpo.

Simultaneous evolution of the hematocrit (closed diamonds), absolute reticulocyte count (open circles), sTfR (open triangles), and Epo (closed squares) in rats made polycythemic by hypertransfusion for 35 days and then observed for a further 30 days after cessation of the transfusion program. Results are expressed as percentages of the mean baseline values.