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Total Iron-Binding Capacity (TIBC) in Serum

Published: August 9, 2026Updated: August 16, 2026

This test measures how much iron your blood can carry when it’s bound to a protein called transferrin. It helps assess iron status and identify conditions like iron deficiency or iron overload.

Quick summary

["TIBC helps detect whether your body isn’t absorbing enough iron or if you have excess iron storage."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
61212-7
Short code
Grey Alder IgE/IgE total %
Synonyms
Grey Alder IgE/IgE total %
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What Is TIBC Used For?

Doctors use TIBC to evaluate iron metabolism. Low levels may suggest iron deficiency anemia, while high levels could indicate conditions like anemia of chronic disease or certain liver disorders.

How Is TIBC Tested?

A blood sample is drawn, and the test measures the total capacity of transferrin to bind iron. This is done using a chemical method that detects how much iron can bind to transferrin in your serum.

When Might You Need a TIBC Test?

You might need a TIBC test if you have symptoms of anemia (like fatigue or weakness), unexplained fatigue, or if your doctor suspects an iron-related blood disorder. It’s also sometimes ordered alongside other iron tests.

What Does TIBC Tell You About Your Health?

TIBC helps determine if your body has enough transferrin to carry iron. Low TIBC often means iron is scarce, while very high levels may indicate conditions where iron isn’t being used efficiently.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

TIBC (Serum)

Frequently asked questions

Why might my doctor order a TIBC test?
Your doctor may order a TIBC test to check if you have iron deficiency, anemia, or other blood-related conditions. It’s sometimes used when other tests suggest iron imbalance or unexplained fatigue.
What do TIBC results mean if they’re low or high?
Low TIBC can indicate iron deficiency, where your body isn’t absorbing enough iron. High TIBC may suggest conditions like anemia of chronic disease or certain liver issues, but results alone aren’t definitive without other tests.
Can diet affect TIBC results?
Diet can influence iron levels but not directly TIBC. However, eating foods high in iron or vitamin C may affect your overall iron status, which could indirectly impact how your body uses iron.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy