IS SERUM TRANSFERRIN RECEPTOR USEFUL FOR DETECTING IRON-DEFICIENCY IN ANAEMIC PATIENTS WITH CHRONIC INFLAMMATORY DISEASES?
We investigated whether determination of serum transferrin receptor (TfR) is useful for detecting iron-deficiency in patients with chronic inflammatory diseases and for differentiating between iron-deficiency anaemia and anaemia of inflammation. Using an immunofluorometric assay, serum TfR was measured in 34 anaemic patients Of these patients, 23 had a chronic rheumatic disease, 13 with both inflammation and iron-deficiency and 10 with anaemia of inflammation only; the other 11 patients had iron-deficiency anaemia and no evidence of inflammation. Serum TfR concentrations were lower in patients with anaemia of inflammation (2.6 ± 0.2 mg/l, mean ± S.E.M.) than in patients with iron-deficiency anaemia (6.7 ± 1.1 mg/l, P<0.01) or those with both inflammation and iron deficiency (5.8 ± 1.0 mg/l, P<0.01). Among patients with inflammatory disease, correlations between TfR and ferritin concentrations (r = 0.62, Pc0.05) and TfR and erythropoietin concentrations (r = 0.69, P<0.001) were observed
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