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TIBC (Total Iron Binding Capacity)
⚠️ Update approaching🔬 Evidence: ModerateHematology
Diğer adları: Iron binding test, TIBC, Total iron binding capacity
⚠️
Discuss your test results with your doctor. This page is for informational purposes only and does not provide a diagnosis.
⚡ Key Facts
• Measures the total iron-binding capacity of transferrin molecules in the blood
• Indirectly reflects transferrin levels
• Elevated TIBC suggests iron deficiency; low TIBC suggests iron overload or chronic disease
• Used to calculate transferrin saturation (TSAT)
🧪 What Does This Test Measure?
The TIBC test measures the total amount of iron that transferrin molecules in the blood can bind, indirectly reflecting the blood's iron-carrying capacity.
📋 Why Is It Ordered?
Ordered for iron deficiency and iron overload evaluation, TSAT calculation, and differential diagnosis of anemia.
🔧 Preparation
TIBC is evaluated alongside serum iron, so the preanalytical conditions for serum iron testing apply. Morning fasting collection may be preferred.
📊 Reference Ranges
Commonly used approximate range:
250–370 µg/dL (45–66 µmol/L)
⚠️ Values vary by laboratory and assay method.
⬆️ High Values
Elevated TIBC may be associated with iron deficiency, pregnancy, or oral contraceptive use. The body increases transferrin production to capture more available iron.
⬇️ Low Values
Low TIBC may be associated with iron overload, chronic disease, liver disease, protein loss, or malnutrition.
⚙️ What Can Affect Results?
Liver function, inflammation, nutritional status, pregnancy, hormonal medications, and protein loss may affect TIBC levels.
🔬 Evidence Summary
Moderate evidence: 3 guidelines, 4 reviews, 1 observational study.
📚 Most Important Studies on This Topic
✅ Key Takeaways
💡
What you learned: TIBC reflects the blood's capacity to bind and transport iron. Elevated TIBC typically indicates the body is trying to absorb more iron due to deficiency.
⛔
A TIBC result alone cannot diagnose iron deficiency or overload. Ferritin, serum iron, TSAT, and clinical context are needed.
🔬 Sources Used on This Page
8 sources · Most recent publication: 2024📋
Guideline
Expert society and guideline recommendations
3
sources
📖
Review
Comprehensive topic evaluation
4
sources
👁
Observational
Observational and cohort studies
1
source
Overall assessment: Evidence level for this topic is moderate. This page is supported by 3 guidelines, 4 reviews, 1 observational study.
📝 Questions to Ask Your Doctor
Be prepared for your appointment. Add questions to your list.
📋 References
[PMID: 39011129] Recommendations for diagnosis, treatment, and prevention of iron deficiency and iron deficiency anemia. HemaSphere, 2024.
[PMID: 35662478] EASL Clinical Practice Guidelines on haemochromatosis. J Hepatol, 2022.
[PMID: 33285139] Iron deficiency. The Lancet, 2021.
[PMID: 34497146] British Society of Gastroenterology guidelines for the management of iron deficiency anaemia in adults. Gut, 2021.
[PMID: 32418671] The changing landscape of iron deficiency. Molecular Aspects of Medicine, 2020.
[PMID: 30401704] Iron deficiency. Blood, 2019.
[PMID: 28947322] Influence of diurnal variation and fasting on serum iron concentrations in a community-based population. Clinical Biochemistry, 2017.
[PMID: 25946282] Iron-deficiency anemia. N Engl J Med, 2015.
Last reviewed: 3/31/2026
Next review: 3/31/2027
🔗 Related Topics
⚖️ This page does not replace medical advice. Make treatment decisions with your doctor.
Content is based on scientific studies indexed in PubMed and current clinical guidelines.
Content is based on scientific studies indexed in PubMed and current clinical guidelines.