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Total Iron-Binding Capacity (TIBC) in Serum

Published: August 9, 2026Updated: August 17, 2026

This test measures the total amount of iron your body can bind to transferrin, a protein that carries iron in the blood. It helps assess iron status and identify potential iron deficiency or iron overload conditions.

Quick summary

["This test helps evaluate your body’s ability to store and use iron effectively."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
2503-1
Short code
Iron Chelated Ur-mCnc
Synonyms
Iron Chelated Ur-mCnc
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Ref low
60
Ref high
170
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
83540
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What Is Total Iron-Binding Capacity (TIBC)?

TIBC reflects the maximum capacity of your blood to carry iron. When iron levels are low (as in anemia), TIBC tends to rise because transferrin binds more iron. Conversely, high TIBC may suggest conditions like pregnancy or certain liver diseases where iron demand increases.

Why Might Your Doctor Order This Test?

Your doctor may request a TIBC test if you have symptoms like fatigue, weakness, or pale skin—common signs of iron deficiency. It’s also used alongside other tests (like serum iron and ferritin) to diagnose iron-related disorders, such as anemia or hemochromatosis.

How Is the Test Performed?

A blood sample is drawn from a vein in your arm. The sample is sent to a lab, where it’s analyzed to measure the iron-binding capacity of your serum. Results are reported in micrograms per deciliter (µg/dL) or milligrams per deciliter (mg/dL), depending on the lab’s standard.

What Do the Results Mean?

TIBC alone doesn’t give a complete picture of iron status. It’s often used alongside other tests (like serum iron and ferritin) to diagnose conditions such as iron deficiency anemia or iron overload. Low TIBC may indicate liver disease or other conditions affecting iron metabolism.

Reference range

NCBI: Serum Iron Male 65-180; Female 50-170 µg/dLN/A

Specimen: urine

Fasting for 12 hours preferred. Iron supplements should be stopped 24 hours before if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

TIBC (Serum)

Frequently asked questions

What causes low or high TIBC levels?
Low TIBC can occur with liver disease, chronic inflammation, or certain medications that interfere with iron absorption. High TIBC is often seen in iron deficiency anemia or during pregnancy, as the body produces more transferrin to carry iron to growing tissues.
Can TIBC results change over time?
Yes, TIBC can fluctuate based on your overall health, diet, and medical conditions. For example, during pregnancy, TIBC may naturally rise due to increased iron needs. If your results are abnormal, your doctor may recommend follow-up tests or adjustments to your diet or treatment plan.
Is fasting required for this test?
No fasting is required for a TIBC test. However, if you’re taking iron supplements or have certain medical conditions (like liver disease), your doctor may advise timing your blood draw around your medication or activity to get the most accurate results.
  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 17, 2026. · Read our editorial policy