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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.
Unsaturated iron binding capacity (UIBC) is a blood test for iron. It is one test of several that is used to help diagnose problems with iron in the body. Iron is an essential mineral the body needs to function properly. About 75% of the body's iron is a component of hemoglobin, the oxygen carrier in red blood cells.