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Total Iron Binding Capacity (TIBC) - Serum

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

This test measures the amount of iron your body can carry in the blood. It helps assess iron status and identify potential iron deficiency or overloading.

Quick summary

["Your TIBC helps doctors check if you have enough iron to make healthy red blood cells."]

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

Key facts at a glance

LOINC
51868-8
Short code
TT imm XXX PPP
Synonyms
TT imm XXX PPP
Category
chemistry
Sample
plasma
Container
Lavender-top (EDTA) or Green-top (Heparin)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
coag-thrombin-induced-factor-substitution-immediately-after-addition-of-xxx
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 Does TIBC Measure?

TIBC measures the total capacity of your blood plasma to bind iron. This is done by determining how much iron is needed to saturate transferrin, the protein that transports iron in the blood. Low TIBC can suggest iron deficiency, while very high levels may indicate conditions like anemia or certain liver diseases.

Why Is TIBC Important?

TIBC is important because it provides insight into your body’s iron reserves. When combined with other tests like serum iron and ferritin, it helps diagnose iron deficiency anemia or iron overload disorders.

How Is TIBC Tested?

This test involves drawing a small amount of blood from a vein in your arm. The blood is then processed to measure the iron-binding capacity of the serum or plasma.

What Might Affect TIBC Results?

Several factors can influence TIBC results, including iron deficiency, pregnancy, certain medications (like antacids or hormonal therapies), and chronic diseases like kidney problems or liver disease.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

TIBC

Frequently asked questions

How often should I get a TIBC test?
A TIBC test is typically ordered when doctors suspect iron deficiency anemia, chronic diseases affecting iron metabolism, or other conditions related to iron imbalance. It may also be part of routine blood work in certain clinical scenarios.
What are the normal values for TIBC?
There is no single set of standard reference ranges for TIBC as values can vary slightly between labs. Your doctor will interpret the result in relation to your overall health and other test results.
Can TIBC results be affected by diet or lifestyle?
Dietary iron intake can indirectly influence TIBC if it affects overall iron status, but the test itself does not directly measure dietary factors. Lifestyle factors like exercise or stress may also impact iron metabolism indirectly.
  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