Groupe 1 (control) n=40 Groupe 2 (IDA) n=30 Groupe 3 (ACD n=60   Men  n=22 Women n=18 Men  n=11 Women n=19 Men  n=36 Women n=24 Age (years) -0.05 -0.22 -0.14 -0.02 -0.02 -0.04 Hémoglobin (g/l) -0.98 -0.97 -0.98 -0.97 -0.71 -0.7 MCV (fl) -0.96 -0.91 -0.97 -0.92 -0.68 -0.67 Hématocrit (%) -0.93 -0.95 -0.94 -0.96 -0.67 -0.7 Serum iron (μmol/l) -0.98 -0.98 -0.98 -0.97 -0.72 -0.68 Ferritin (μg/l) -0.98 -0.94 -0.98 -0.95 -0.59 -0.65 Transferrin (mg/l) -0.98 -0.98 -0.98 0.99 0.7 0.7 CTS (%) -0.97 -0.98 -0.99 -0.96 -0.73 -0.67 TCF (μmol Fe/l) -0.98 -0.98 -0.98 0.99 -0.7 -0.7 sR-fT (mg/l) 1 1 1 1 1 1 sR-fT /Log(Ferritin) 0.99 0.99 0.99 0.96 0.99 0.99

Table 2: The values of correlation coefficients (r) of the main parameters of iron status with the sR-fT in the control group and two groups of anemic subjects (results are expressed separately for both sexes). Negative values (r) indicate a negative correlation; positive values of (r) indicate a change in the same direction; group 1 (control or reference): healthy subjects; Group 2 (IDA): iron deficiency anemia; Group 3 (ACD): anemia of chronic disease; MCV: mean corpuscular volume; CTS: Coefficient of Transferrin Saturation; TCF: Total Capacity of Fixing the transferrin; sRfT: Soluble Transferrin receptor.