What is Transferrin?
Transferrin binds iron and transports it to where it is needed, such as the bone marrow for blood production. During iron deficiency, transferrin often rises as the body attempts to capture iron more efficiently. Interpretation works best with serum iron, ferritin, and transferrin saturation.
Why is Transferrin relevant?
Transferrin is the protein that carries iron through your blood — essentially a shipping company. When iron runs low, the body makes more transferrin to move the limited supply around more efficiently, so an elevated transferrin often fits iron deficiency. With inflammation, liver stress, or undernutrition, the value can drop instead, which changes how it is read.
How to read Transferrin in context
Always read transferrin alongside ferritin, serum iron, and transferrin saturation: only then does an honest picture of iron metabolism emerge. Elevated transferrin with low ferritin and low saturation classically signals iron deficiency; with inflammation, ferritin can look falsely high while transferrin and saturation drop. Symptoms and context decide which pattern fits.