Treatment with rhEpo induces a strong and early decrease in urinary hepcidin. Urinary hepcidin levels were determined by SELDI-TOF-MS and are expressed in mega intensity units (MIU) per millimole of creatinine. Individual data for 8 participants, as well as mean values, are shown. The statistical differences from pre-rhEpo values were calculated with the Wilcoxon test; *P < .05.