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Total Iron Binding Capacity (TIBC) in Serum/Plasma

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

This test measures how much iron your blood can carry, which helps assess iron status and potential deficiencies.

Quick summary

["Your blood’s ability to transport iron is evaluated here to check for iron deficiency or overload."]

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

Key facts at a glance

LOINC
108738-6
Short code
TIBC Msmt SerPl
Synonyms
TIBC Msmt SerPl
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?

TIBC helps diagnose iron deficiency anemia by measuring the blood’s capacity to bind iron. It’s also used alongside other tests to evaluate iron metabolism and identify conditions like hemochromatosis or anemia.

How Is TIBC Different from Ferritin or Iron Levels?

While ferritin measures stored iron and iron levels show circulating iron, TIBC reflects the blood’s total iron-binding capacity, giving insight into how well iron can be transported.

Why Might Your Doctor Order a TIBC Test?

Your doctor may request TIBC if you have symptoms like fatigue, pale skin, or unexplained anemia, or if they suspect iron-related disorders like iron deficiency or overabsorption.

What Does a TIBC Test Involve?

A blood sample is drawn, and the test measures the serum/plasma’s ability to bind iron using a specialized chemical reaction, often via nephelometry or turbidimetry.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

TIBC

Frequently asked questions

Why do I need this test if I don’t have symptoms?
Even without symptoms, doctors may order TIBC as part of a broader blood workup to screen for iron-related conditions, especially if you have risk factors like frequent blood donations, heavy periods, or certain medical conditions.
What are the typical results or reference ranges?
TIBC results are not standardized across labs, so your doctor will interpret them in relation to your other blood tests (like iron and ferritin) rather than a single numeric range.
Could my TIBC results change with diet or supplements?
Dietary iron intake or supplements may indirectly affect TIBC by influencing iron levels, but TIBC itself is not directly influenced by diet unless iron stores are altered.
  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