Iron binding tests (TIBC, UIBC, transferrin saturation)
Quick answer: These blood tests show how much iron your blood can carry and how much of that capacity is being used. They are ordered with serum iron and ferritin to look into anaemia, low iron or iron overload.
- SampleBlood
- TakesAbout 5 minutes
- Before the testA morning sample is often preferred; follow the lab's instructions.
- In fertility careIron levels are often checked before and during pregnancy, when the need for iron goes up.
How the test is done
- 1A morning sample is often preferred, as iron levels vary through the day
- 2The skin over a vein is cleaned
- 3Blood is drawn into a tube, usually with serum iron and ferritin
- 4The lab works out TIBC, UIBC and transferrin saturation
What your results can mean
Reading your report
Normal ranges differ between labs, so compare your result with the range printed on your report and discuss it with your doctor.
If the result is outside the usual range
A high TIBC with low saturation can point to iron deficiency, and is also seen in pregnancy or with hormone pills. A low TIBC with high saturation can point to iron overload, while a low TIBC can also be seen with long-term illness or poor nutrition.
Who usually has this test
People with anaemia, tiredness, heavy periods, or suspected iron overload, and women before or during pregnancy.
Risks and aftercare
You can take your iron tablet after the sample if your doctor has told you to do so.
Names and options
Also called: TIBC, UIBC, transferrin saturation, iron saturation
Options
- Transferrin saturation %
- TIBC (total iron binding capacity)
- UIBC (unsaturated iron binding capacity)
Listed by the hospital as
- SATUARTION %
- TIBC, SERUM
- UNSATURATED IRON BOUND CAPACITY
Questions about this test
What is transferrin saturation?
Transferrin saturation shows what percentage of the iron-carrying protein is loaded with iron. A low percentage suggests iron deficiency, while a high percentage can suggest iron overload.
Should I stop iron tablets before this test?
Iron tablets can affect the result. Ask your doctor whether to skip your dose on the morning of the test, but do not stop treatment on your own.
Why is ferritin tested with TIBC?
Ferritin shows how much iron is stored, while TIBC and saturation show how much is being carried in the blood. Together they give a clearer picture of your iron status.
Related tests
Tamara Hospital & IVF Centre, Rajajinagar
34/3, 10th Cross Road, opp. Vardhaka Sardar Patel School, 1st N Block, 2nd Stage, Rajajinagar, Bengaluru 560010
The hospital is open 24 hours. Call before you come to check the timing for your scan or sample collection.
Get directions ↗IVF Pulse fertility care at Tamara Hospital →
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This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.