RESUMO
BACKGROUND: Transferrin receptor mediates cellular uptake of iron, and the expression on cells reflects iron needs and erythropoietic activity. The results of measuring transferrin receptor in serum (sTfR) in blood donors are presented. STUDY DESIGN AND METHODS: Haemoglobin, serum-ferritin and sTfR were measured in 172 female and 174 male donors that had donated whole blood six or more times during the previous 3 years and in 96 female and 56 male new donors. RESULTS: Haemoglobin and sTfR were not significant different in new and repeat donors. New donors had significantly higher s-ferritin than repeat donors. Twenty donors had a Hb above the low limit for normal, but below the determined cut-off for donation. Only three of these had high sTfR and/or low serum-ferritin. Hence, of the total 492 donors 3.5% were below the Hb cut-off, but having Hb, s-ferritin and sTfR within normal ranges. 11.6% of new female donors belonged in this category. CONCLUSION: STfR is better than s-ferritin as a screening for iron deficiency. Most donors with low tissue iron neither have high sTfR, nor anaemia. There is probably no need to have a separate, higher than the lower normal range, requirement for Hb in donors. STfR measurements are probably most valuable in a setting where most donors are repeat donors.