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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.
Definition of tic for English Language Learners. : 1  a small repeated movement of a muscle especially in the face that cannot be controlled. : 2  a word or phrase that someone frequently says or an action that someone frequently does without intending to.