Introduction: The aim of our study was to examine the relationship of hepcidin-25 with red blood cell and reticulocyte indices and to evaluate the diagnostic properties of hepcidin-25 in the assessment of positive iron balance in end-stage renal disease (ESRD) patients.
Methods: Eighty anemic ESRD patients (hemoglobin < 110 g/L) were classified as having iron deficiency (ID, N = 20), iron sufficiency (IS, N = 29), and positive iron balance (PB, N = 31) using the conventional biomarkers for iron status evaluation. Hepcidin-25 was determined by a chemiluminescent direct ELISA.
Results: Hepcidin-25 was significantly negatively correlated with the proportion of hypochromic erythrocytes (%HYPO) (P = .034) and immature reticulocyte fraction (P = .010) in ID and with the absolute reticulocyte concentration in ID (P = .048) and PB (P = .040). In multivariate models, hepcidin-25 was independently negatively associated with the mean reticulocyte hemoglobin content (CHr; β = -0.493, P = .004) and red blood cell size factor (RSf) (β = -0.334, P = .036) only in the PB group. The best hepcidin-25 value to exclude PB was 66.13 µg/L, showing a sensitivity of 61.3%, a specificity of 75.5%, and an AUC of 0.808.
Conclusion: Our results suggest that hepcidin-25 levels are independently negatively associated with the iron demand for the most recent erythropoiesis only in PB. Hepcidin-25 performed acceptable in discriminating anemic ESRD patients with positive iron balance and may prove to be a useful additional tool in the evaluation of iron status.
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