This graph indicates the exponential relationship between serum erythropoietin levels (EPO, milliUnits/mL, logarithmic scale) and venous hematocrit (percent, linear scale) in normal and anemic subjects without renal or chronic diseases. EPO was assayed by either bioassay or radioimmunoassay.
Adapted from:
Erslev AJ, Caro J. Physiologic and molecular biology of erythropoietin. Med Oncol Tumor Pharmacother 1986; 3:159.
Erslev AJ, Wilson J, Caro J. Erythropoietin titers in anemic, nonuremic patients. J Lab Clin Med 1987; 109:429.