ron transportation Fe2+→Fe3+→ ferritin Fest-transferrin-receptor(erythroblast) 1 mitochondria protoporphyrin, heme ferritin Total iron-binding capacity(TIBC) Serum iron(sD) Transferrin saturation SITIBC X100%0=33%035%o Tansferrin receptorIron transportation Fe2+ → Fe3+ → ferritin Fe3+→transferrin→receptor (erythroblast) → mitochondria protoporphyrin heme ferritin Total iron-binding capacity(TIBC) Serum iron (SI) Transferrin saturation :SI/TIBC×100%=33%~35% Tansferrin receptor