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This panel contains the following tests:
Iron plays a principle role in the formation and maturation of red blood cells. Of the body’s normal 4-5 grams of iron, approximately 65% resides in hemoglobin with a small amount also being found in muscle and in cellular enzymes throughout the body’s tissues. Any remaining iron is stored mostly in the liver bound to a protein called ferritin. The amount of ferritin found in your blood shows how much iron is stored in your body.
Transferrin is a protein that transports iron from your intestines to cells throughout your body. Normally, about 1/3 of the transferrin in your body is being used to transport iron. The percent of transferrin that has iron bound to it is called your iron saturation.
Serum iron is a measure of the total circulating iron in your blood and TIBC is an indirect measure of the amount of transferrin you have. On average about one third of the transferrin in your body is being used to transport iron. The remaining transferrin, not being used to transport iron is called the UIBC.
When analyzed together, these tests are helpful in defining a variety of iron problems and will help your doctor differentiate between different types of anemia. TIBC is high in iron deficiency anemia and low/normal with anemia of chronic disease. TIBC is also used to help doctors diagnose iron overload, which is called hemochromatosis.
Low levels of iron are associated with iron deficiency anemia. Anemia is associated with fatigue, low energy, and in some cases, can manifest as muscle aches and headaches. High levels of iron are associated with liver disease, kidney disease and vitamin B6 deficiency.
This test may be done fasting or 2-6 hours after eating. Both ways provide valuable information, though 2-6 hours after a meal provides a more realistic assessment of the state of your blood in everyday life. Stay hydrated and take your medications as prescribed. Iron measurements following blood donations or transfusions should be delayed for one week.
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