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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.
1 Iron is an important mineral found in all cells of the body. Itâs needed to produce a protein that carries oxygen through the bloodstream.  In the blood, a protein called transferrin, which is made by the liver, carries iron. A TIBC test measures how much iron is carried in your bloodstream.