RESPONSE OF SERUM TRANSFERRIN RECEPTOR TO IRON SUPPLEMENTATION IN IRON-DEPLETED, NONANEMIC WOMEN

Serum transferrin receptor (sTfR) concentration has been recognized re cently as a reliable indicator of functional iron deficiency, but its response to iron supplementation has not been investigated in marginal ly iron-deficient women. In this randomized, double-blinded trial, 37 female subjects aged 19-35 y with iron depletion without anemia (hemog lobin >120 gn and serum ferritin <16 mu g/L) received an iron suppleme nt or placebo for 8 wk. Iron status was measured before treatment, aft er 4 wk of treatment, and posttreatment (ie, after 8 wk of treatment). Iron supplementation of these iron-depleted, nonanemic women resulted in a progressive and significant decrease in sTfR and a significant i ncrease in serum ferritin, and prevented a fall in hemoglobin. The res ponsiveness of sTfR to iron treatment indicated that sTfR is a sensiti ve indicator of marginal iron deficiency in iron-depleted, nonanemic w omen, even when their body iron stores were being replenished.