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Total Iron-Binding Capacity (TIBC)

Published: July 27, 2026Updated: August 25, 2026

Total Iron-Binding Capacity (TIBC) measures the maximum amount of iron that can be bound by transferrin in the blood, providing insight into iron metabolism and storage.

Quick summary

TIBC measures the blood's capacity to bind iron, aiding in diagnosing iron-related conditions.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 25, 2026Editorial policy

Key facts at a glance

Units
μg/dL
Clinical utility
diagnostic
Result kind
quantitative
FDA-cleared
Roche TIBC, Abbott TIBC, Siemens TIBC
interpretation: {"text":"Indicates iron deficiency, as the body increases transferrin production to capture more iron.","label":"High TIBC"}; {"text":"Suggests conditions like hemochromatosis, anemia of chronic disease, or malnutrition.","label":"Low TIBC"}

Total Iron-Binding Capacity (TIBC) is a blood test that measures how well transferrin, a protein in the blood, can carry iron. This test is crucial for assessing the body's iron levels and its ability to transport iron.

A high TIBC typically indicates iron deficiency, as the body produces more transferrin to maximize the use of the little iron available. Conversely, a low TIBC may suggest conditions such as hemochromatosis, anemia of chronic disease, or malnutrition.

The reference range for TIBC is generally between 250–400 μg/dL. Results outside this range can help diagnose various conditions related to iron metabolism, including anemia and iron overload disorders.

Frequently asked questions

What is a normal TIBC range?
The normal TIBC range is typically between 250–400 μg/dL.
What does a high TIBC mean?
A high TIBC often indicates iron deficiency, as the body produces more transferrin to maximize iron usage.
  1. 1
    Mayo Clinic: Total Iron-Binding Capacity (TIBC) TestSource
  2. 2
    MedlinePlus: Total Iron-Binding CapacitySource

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 25, 2026. · Read our editorial policy