What this marker measures
Transferrin saturation is one of the most informative iron markers. Combined with ferritin, it helps distinguish iron deficiency anemia from the anemia of chronic disease — two common conditions with very different management.
High or low: what it can mean
High Transferrin Saturation
A high transferrin saturation (above 45–55%) may suggest iron overload and warrants further investigation, particularly for hereditary hemochromatosis if consistently elevated.
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Low Transferrin Saturation
A low transferrin saturation (below 15–20%) alongside low ferritin is a reliable indicator of iron deficiency anemia. Low saturation with normal or high ferritin suggests anaemia of chronic disease.
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Frequently asked questions
What is Transferrin Saturation?
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Transferrin saturation expresses the percentage of transferrin binding sites currently occupied by iron. It is calculated from serum iron and TIBC and reflects the efficiency of iron delivery to tissues.
What does Transferrin Saturation measure?
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Transferrin saturation is one of the most informative iron markers. Combined with ferritin, it helps distinguish iron deficiency anemia from the anemia of chronic disease — two common conditions with very different management.
What does high Transferrin Saturation mean?
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A high transferrin saturation (above 45–55%) may suggest iron overload and warrants further investigation, particularly for hereditary hemochromatosis if consistently elevated.
What does low Transferrin Saturation mean?
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A low transferrin saturation (below 15–20%) alongside low ferritin is a reliable indicator of iron deficiency anemia. Low saturation with normal or high ferritin suggests anaemia of chronic disease.
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Editorial note
LabTestly explains lab markers using plain-English educational content. Reference ranges may vary by laboratory and should be interpreted with a clinician.
Educational content · Editorially reviewed for clarity · Last updated
Common sources used for lab-test education
Not medical advice
This page is for general understanding only and does not replace medical advice from your clinician. Reference ranges can vary by laboratory, age, sex, pregnancy status, medications, and clinical context.