Transferrin Saturation
Severe iron deficiency with depleted iron stores
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Evidence-based calculations Used in clinical settings worldwide Regular monitoring recommended
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Iron Deficiency Anemia
Classic IDA with low TSAT, low ferritin, low hemoglobin
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Functional Iron Deficiency
Low TSAT but normal/elevated ferritin (inflammation)
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Hereditary Hemochromatosis
High TSAT and ferritin indicating iron overload
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CKD on Dialysis
Hemodialysis patient on ESA therapy
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Pregnancy with IDA
Iron deficiency in second trimester pregnancy
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Normal Iron Status
Healthy individual with normal iron studies
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Anemia of Chronic Disease
Low-normal TSAT with elevated ferritin
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Transfusion-Related Iron Overload
Multiple transfusions in thalassemia major
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Sample Clinical Scenarios
Iron Studies
Additional Iron Markers
Patient Demographics
Clinical Context
For educational and informational purposes only. Verify with a qualified professional.
๐ฅ Health Facts
โ WHO
โ CDC
What is Transferrin Saturation (TSAT)?
Transferrin Saturation (TSAT) represents the percentage of transferrin's iron-binding sites that are occupied by iron. Transferrin is the primary iron transport protein in blood, and TSAT reflects how much of its capacity is being utilized.
Normal TSAT (20-50%)
- Adequate iron for erythropoiesis
- ~33% saturation is typical
- Balanced iron delivery to tissues
Abnormal TSAT
- <20%: Iron deficiency / functional ID
- >50%: Possible iron overload
- >70%: High risk of tissue iron deposition
How Does TSAT Assessment Work?
TSAT is best interpreted alongside ferritin levels to distinguish between different iron disorders. Low TSAT with low ferritin indicates absolute iron deficiency, while low TSAT with normal/high ferritin suggests functional iron deficiency (iron is stored but not available for use).
Interpretation Matrix:
| TSAT | Ferritin | Interpretation |
|---|---|---|
| <20% | Low | Absolute Iron Deficiency |
| <20% | Normal/High | Functional Iron Deficiency |
| 20-50% | Normal | Normal Iron Status |
| >50% | High | Iron Overload |
When to Use TSAT?
Clinical Indications:
- Anemia workup: Distinguish IDA from other causes
- CKD management: Guide ESA and iron therapy
- Hemochromatosis screening: First-line test
- Iron therapy monitoring: Assess response
Special Populations:
- Dialysis patients: KDOQI targets apply
- Pregnancy: Lower thresholds may apply
- Chronic inflammation: Use higher ferritin cutoffs
- Liver disease: Interpretation may be altered
TSAT Calculation Formula
Primary Formula:
Alternative using Transferrin:
Example:
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