Transferrin carries iron in your blood and helps show if your iron supply is adequate.
Transferrin is the main protein that carries iron through your blood, picking it up from the gut and stores and delivering it to where it is needed, such as the bone marrow that makes red blood cells.
Measuring transferrin shows how much iron-carrying capacity your blood has. The body makes more transferrin when iron is scarce, so the level rises in iron deficiency.
A transferrin test adds depth to iron status. High transferrin often signals iron deficiency, because the body builds more carriers to capture what little iron is available.
Low transferrin can occur with iron overload, chronic illness, inflammation, liver disease, or malnutrition. Transferrin is used to work out transferrin saturation, which tells you how full the iron carriers are, and is best read with iron and ferritin.
Aniva reads your result against research-backed ranges, not just the lab's wide normal. The reference shown below is specific to this biomarker.
Ranges are guidance and vary by laboratory and method.
| Group | Reference range (SI) |
|---|---|
| Adults | 2.0 to 3.6 g/L |
Aligned to German laboratory practice (DGKL). Always interpret against your own lab's range.
Transferrin rises in pregnancy and with estrogen-containing contraceptives. It falls with inflammation, infection, liver disease, and malnutrition, so a low value does not always mean iron overload. These effects should be considered when reading the result.
Best read with serum iron, transferrin saturation, total iron-binding capacity (TIBC), and ferritin.
What does a transferrin result mean? Higher levels often suggest low iron stores or increased demand. Lower levels can reflect inflammation, liver issues, or low protein intake.
Do I need to fast before this test? No. Fasting is not required for a transferrin test.
What can affect my result? Iron pills or recent transfusion, estrogen or androgen therapy, pregnancy, acute illness, dehydration, heavy exercise, and high-dose biotin can all shift results.
How often should I test transferrin? Test when checking anemia or iron balance, and recheck as your clinician advises, often after weeks to months if monitoring.
How long do results take? Results are usually ready in about 7 days.
What should I discuss with my clinician? Share symptoms, diet, possible blood loss, medications, and supplements. Ask whether to add ferritin, serum iron, and a CBC for a clearer picture.
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