TIBC (Total Iron Binding Capacity) measures how much iron your blood proteins could carry. It goes up when iron is low.
- Normal range (adults)
- 250–370 µg/dL (45–66 µmol/L)
- Sample
- Blood
- Fasting
- Not usually needed
- Also called
- Total Iron Binding Capacity, T.I.B.C, Iron Binding Capacity, Transferrin Capacity
TIBC normal range
| Group | µg/dLConventional units: US, South Asia | µmol/LSI units: UK, Europe, Australia, international |
|---|---|---|
| Adults | 250–370 | 45–66 |
Your report may use either unit system; labs in the Gulf often print both. Ranges also vary slightly between laboratories, so the range printed on your own report is the one to go by.
Why is the TIBC test done?
It is part of iron studies and helps tell iron deficiency from other causes of anemia.
What does a high TIBC level mean?
A high TIBC usually means iron deficiency: the body makes more transport protein to grab any available iron.
Common causes
- Iron deficiency
- Pregnancy
- Contraceptive pills
Diet and lifestyle tips
- Iron-rich foods with vitamin C
- Avoid tea and coffee at mealtimes
What does a low TIBC level mean?
A low TIBC is seen with inflammation, malnutrition or iron overload.
Common causes
- Chronic inflammation or infection
- Malnutrition
- Liver disease
- Iron overload
Diet and lifestyle tips
- Adequate protein
- Treat the underlying cause
When should you see a doctor?
Your doctor will read TIBC with serum iron and ferritin.
Last updated
This page is for general education and is not a diagnosis. Normal ranges differ between laboratories, so always compare your result with the reference range printed on your own report, and discuss abnormal results with your doctor.