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Total iron binding capacity (TIBC) is a blood test to see if you have too much or too little iron in the blood. Iron moves through the blood attached to a protein called transferrin. This test helps your doctor know how well that protein can carry iron in the blood.
Explaines how the TIBC, UIBC, and transferrin tests are used, when TIBC, UIBC, and transferrin tests are ordered, and what the results of these tests might mean. Total iron-binding capacity (TIBC) is most frequently used along with a serum iron test to evaluate people suspected of having either iron deficiency or iron overload. These two tests are used to calculate the transferrin saturation, a more useful indicator of iron status than just iron or TIBC alone.