Total iron binding capacity
Total iron binding capacity (TIBC) is a blood test to see if you have too much or too little iron in your blood. Iron moves through the blood attached to a protein called transferrin. This test helps your health care provider know how well that protein can carry iron in your blood.
How the Test is Performed
A blood sample is needed.
Blood sample
Venipuncture is the collection of blood from a vein. It is most often done for laboratory testing.
How to Prepare for the Test
You should not eat or drink for 8 hours before the test.
Certain medicines may affect the result of this test. Your provider will tell you if you need to stop taking any medicines. Do not stop any medicine before talking to your provider.
Medicines that can affect the test result include:
- Adrenocorticotropic hormone (ACTH)
- Birth control pills
- Fluorides
How the Test will Feel
When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or a slight bruise. This soon goes away.
Why the Test is Performed
Your provider may recommend this test if:
- You have signs or symptoms of anemia due to low iron
Anemia
Anemia is a condition in which the body does not have enough healthy red blood cells. Red blood cells provide oxygen to body tissues. Different type...
ImageRead Article Now Book Mark Article - Other lab tests suggest you have anemia due to low iron levels
Normal Results
Normal value range is:
- Iron: Males: 50 to 150 mcg/dL (8.95 to 26.85 micromol/L); Females: 35 to 145 mcg/dL (6.26 to 25.95 micromol/L)
- Total iron binding capacity (TIBC): Males: 171 to 505 mcg/dL (30.6 to 90.3 micromol/L); Females: 149 to 492 mcg/dL (26.7 to 88.0 micromol/L)
- Iron saturation: Males: 20% to 50%; Females: 15% to 45%
The numbers above are common measurements for results of these tests. Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your provider about the meaning of your specific test results.
What Abnormal Results Mean
TIBC is usually higher than normal when the body's iron supplies are low. This can occur with:
-
Iron deficiency anemia
Iron deficiency anemia
Anemia is a condition in which the body does not have enough healthy red blood cells. Red blood cells provide oxygen to body tissues. There are man...
ImageRead Article Now Book Mark Article - Pregnancy (late)
Lower-than-normal TIBC may mean:
- Anemia due to red blood cells being destroyed too quickly (hemolytic anemia)
Hemolytic anemia
Anemia is a condition in which the body does not have enough healthy red blood cells. Red blood cells provide oxygen to body tissues. Normally, red ...
ImageRead Article Now Book Mark Article - Lower-than-normal level of protein in the blood (hypoproteinemia)
- Inflammation
- Liver disease, such as cirrhosis
Cirrhosis
Cirrhosis is scarring of the liver and poor liver function. It is the last stage of chronic liver disease.
ImageRead Article Now Book Mark Article - Malnutrition
- Decrease in red blood cells from the intestines not properly absorbing vitamin B12 (pernicious anemia)
Pernicious anemia
Anemia is a condition in which the body does not have enough healthy red blood cells. Red blood cells provide oxygen to body tissues. There are man...
ImageRead Article Now Book Mark Article -
Sickle cell anemia
Sickle cell anemia
Sickle cell disease is a disorder passed down through families. The red blood cells that are normally shaped like a disk take on a sickle or crescen...
ImageRead Article Now Book Mark Article
Risks
There is little risk involved with having your blood taken. Veins and arteries vary in size from one person to another and from one side of the body to the other. Taking blood from some people may be more difficult than from others.
Other risks associated with having blood drawn are slight, but may include:
- Excessive bleeding
-
Fainting or feeling lightheaded
Fainting
Fainting is a brief loss of consciousness due to a drop in blood flow to the brain. The episode most often lasts less than a couple of minutes and y...
Read Article Now Book Mark Article - Multiple punctures to locate veins
-
Hematoma (blood buildup under the skin)
Hematoma
A bruise is an area of skin discoloration. A bruise occurs when small blood vessels break and leak their contents into the soft tissue beneath the s...
ImageRead Article Now Book Mark Article - Infection (a slight risk any time the skin is broken)
Reviewed By
Todd Gersten, MD, Hematology/Oncology, Florida Cancer Specialists & Research Institute, Wellington, FL. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
Camaschella C. Disorders of iron homeostasis: iron deficiency and overload. In: Hoffman R, Benz EJ, Silberstein LE, et al, eds. Hematology: Basic Principles and Practice. 8th ed. Philadelphia, PA: Elsevier; 2023:chap 37.
Markell M, Siddiqi HA. Vitamins and trace elements. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Philadelphia, PA: Elsevier; 2022:chap 27.
Means Jr RT. Approach to the anemias. In: Goldman L, Cooney KA, eds. Goldman-Cecil Medicine. 27th ed. Philadelphia, PA: Elsevier; 2024:chap 144.
Disclaimer
All rights reserved.