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Aim. To investigate detectability of anemia, its clinical and pathophysiological features in patients with diabetic nephropathy (DN). Material and methods. The trial included 1020 patients with type 1 and 2 diabetes mellitus (DM). DN was diagnosed in 50% of them. Incidence of anemia was compared in 92 DN patients in type 1 DM and in 230 patients with chronic glomerulonephritis (CGN). Concentration of erythropoietin (EP) in blood serum was measured in 94 DN patients in type 1 and 2 DM. Results. Anemia develops in type 1 and 2 DM patients free of DN and unaffected renal filtration function (glomerular filtration rate - GFR > 60 ml/min 1.73 m2) was 23.3 and 18.3%, respectively. In DN patients incidence rate of anemia depended on GFR and increased with growing severity of renal failure reaching 85.7% in GFR