Iron studies: what is included

In shortIron studies evaluate iron stores (ferritin), transport (transferrin, TIBC, transferrin saturation), and regulation (hepcidin). The panel distinguishes true iron deficiency, anemia of chronic disease, and iron overload — three states with fundamentally different management. Drawn fasting in the morning.

What this panel covers

Iron circulates bound to transferrin, sits in stores inside ferritin, and the liver hormone hepcidin gates both absorption and release from stores. No single number describes the system: serum iron swings through the day, ferritin rises with inflammation, and transferrin falls.

That is why the panel is read together: ferritin shows the stores, transferrin saturation the iron available for blood formation, soluble transferrin receptor the cells' demand, and hepcidin the regulatory signal explaining why iron is unavailable.

Markers on the panel

Iron (serum)Ferritin Transferrin Total iron-binding capacity Transferrin saturation (TSAT)Soluble transferrin receptor Hepcidin

Why it is ordered

The panel is ordered for anemia and its hidden causes, chronic inflammatory conditions, suspected hemochromatosis, and before iron therapy. Its key question: is iron truly lacking, or merely hidden by inflammation.

How to prepare

Morning fasting sample, 8–12 hours: serum iron follows a daily rhythm with a morning peak. Iron supplements beforehand distort the result — the provider specifies the pause. Serial testing uses one laboratory at the same time of day.

How to read the report

True deficiency: low ferritin and saturation with high transferrin and TIBC. Anemia of chronic disease: normal or high ferritin with low saturation and high hepcidin. Overload: high ferritin and saturation with low hepcidin. CRP helps account for inflammation.

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Frequently asked questions

Why not just ferritin?

Ferritin is an acute-phase protein: inflammation raises it and masks deficiency. The combination with transferrin saturation, receptor, and hepcidin removes this confusion.

How does the panel differ from serum iron alone?

Serum iron reflects only the moment of the draw and swings widely through the day and during illness. The panel shows stores, transport, and regulation — the whole system at once.

Sources

Iron tests: MedlinePlus Medical Test — MedlinePlus, National Library of Medicine. Accessed: August 31, 2026.