Iron + Total Iron Binding Capacity

This test measures iron in your blood and total iron binding capacity (TIBC), which reflects how much iron your blood can carry using a protein called transferrin. Together, these measurements can help assess whether too little or too much iron is available in your circulation. They can also be used to calculate transferrin saturation—the percentage of available iron-binding sites carrying iron. Testing may help investigate fatigue, weakness, suspected iron deficiency, or possible iron overload.