Home › Lab markers › TIBC (Total Iron-Binding Capacity)
NUTRIENTS & INFLAMMATION
Also printed as: TIBC · Transferrin · Iron binding capacity
Educational only — not medical advice.
TIBC measures how much iron your blood could carry if all the transport protein were loaded — essentially the size of the fleet rather than the cargo on board. It reflects transferrin levels. Together with serum iron it produces transferrin saturation, the percentage of capacity actually in use.
TIBC moves in a way that is easy to misread: it tends to rise when iron stores are low, which feels backwards until you picture the body building more carriers to catch what iron there is.
TYPICAL ADULT RANGE
Many labs report roughly 250–450 µg/dL for adults. Ranges vary by lab. Reported in µg/dL.
Reference ranges vary by lab, by method, and by age and sex. Always read your own result against the range printed on your report.
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A lower TIBC can accompany inflammation, liver conditions, lower protein levels, or iron overload. Because transferrin is a protein made by the liver, anything that lowers protein production lowers TIBC too. It is read alongside ferritin and serum iron rather than alone, and your doctor will use the combination rather than this single value.
A higher TIBC most commonly accompanies low iron stores — the body makes more transport protein when there is less iron to carry. Pregnancy and estrogen-containing medications also raise it. On its own it is a supporting detail; combined with a low serum iron and low ferritin it forms a recognisable pattern your doctor can interpret directly.
Your doctor is the one who can read this number against your history, symptoms, and medications.
Educational only — not medical advice. Lab results only mean something alongside your history, symptoms, medications, and the rest of your panel. Bring questions to your doctor; they are the one who can interpret your results for you.
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