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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 by binding to a protein called transferrin.

Quick summary

["TIBC helps assess iron availability and potential iron deficiency or overload."]

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

Key facts at a glance

LOINC
35215-3
Short code
TIBC SerPl-msCnc
Synonyms
TIBC SerPl-msCnc
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 is often used alongside other blood tests, such as serum iron and ferritin, to diagnose conditions like iron deficiency anemia or hemochromatosis (iron overload). It can also help evaluate nutritional status and identify underlying causes of fatigue or weakness.

How Is TIBC Different from Other Iron Tests?

Unlike direct iron measurements, TIBC indirectly reflects the total capacity of transferrin to bind iron. This distinction is important because it provides a broader view of iron metabolism rather than just current iron levels in your blood.

What Might Affect Your TIBC Results?

Several factors can influence TIBC, including dietary iron intake, chronic inflammation (which may lower transferrin levels), pregnancy, and certain medications. If you suspect an underlying condition, discuss these with your healthcare provider.

When Might You Need a TIBC Test?

A TIBC test may be recommended if you have symptoms like fatigue, pale skin, or shortness of breath, which could indicate iron deficiency. It may also be part of a broader evaluation for unexplained anemia or iron-related disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

TIBC

Frequently asked questions

Why do doctors check TIBC?
Doctors use TIBC to help diagnose iron deficiency anemia by comparing it with serum iron levels. If TIBC is high and serum iron is low, it suggests transferrin is saturated with iron, pointing toward deficiency. Conversely, low TIBC may indicate conditions like chronic inflammation or liver disease.
How does TIBC relate to other blood tests?
TIBC is often paired with serum iron and ferritin to create a complete picture of iron status. For example, if ferritin (a storage marker) is low and TIBC is high, it may signal iron deficiency despite normal serum iron levels.
Can TIBC help monitor treatment?
Yes, TIBC can be used to monitor iron replacement therapy or other treatments affecting iron metabolism. Repeated tests help track whether iron levels are improving or if adjustments to treatment are needed.
  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