What is a Serum Transferrin test?
This test measures the level of transferrin in your blood. Transferrin is a protein made mainly by the liver. Its main function is to transport iron through your bloodstream to tissues that need it, including the bone marrow, where iron is used to make red blood cells.
Because transferrin is closely involved in iron transport, measuring it can provide important information about your body's iron status.
A Serum Transferrin test can help evaluate iron deficiency, iron overload, anemia, and certain liver or nutritional disorders.
Other names: Transferrin blood test, serum transferrin, iron-binding protein
What is it used for?
A Serum Transferrin test may be used to help:
Evaluate iron deficiency
When the body's iron stores are low, the liver may produce more transferrin to increase the blood's ability to transport available iron.
Transferrin testing can therefore be useful when investigating iron deficiency anemia.
Evaluate iron overload
Transferrin can be measured together with serum iron and other tests to help evaluate conditions in which the body stores too much iron.
Investigate anemia
Transferrin is often included in an iron study when investigating different causes of anemia.
Assess nutritional and liver status
Because transferrin is produced mainly by the liver, its concentration can be affected by liver disease, inflammation, and nutritional status.
Why do I need a Serum Transferrin test?
You may need a Serum Transferrin test if:
You have anemia and the cause is unclear.
Your healthcare provider suspects iron deficiency.
You have abnormal serum iron or ferritin results.
Your provider suspects iron overload.
You have a condition that may affect iron metabolism.
Your provider wants to evaluate your nutritional or liver status as part of a broader assessment.
What happens during a Serum Transferrin test?
A Serum Transferrin test uses a sample of your blood.
A healthcare professional will take a blood sample from a vein in your arm using a small needle. The blood is collected into a test tube or vial and sent to the laboratory for analysis.
You may feel a little sting when the needle goes in or out. The procedure usually takes less than five minutes.
Will I need to do anything to prepare for the test?
Usually, no special preparation is required for a transferrin blood test.
However, if transferrin is being measured as part of a complete iron profile, your healthcare provider or laboratory may recommend specific preparation, such as fasting.
Follow any instructions provided by your healthcare provider or laboratory.
Are there any risks to the test?
There is very little risk to having a blood test.
You may have slight pain, bruising, or tenderness at the site where the needle was inserted. These symptoms usually go away quickly.
What do the results mean?
The meaning of your transferrin result depends on your serum iron, ferritin, transferrin saturation (TSAT), total iron-binding capacity (TIBC), inflammation status, liver function, nutritional status, and other clinical findings.
In general:
A high level of Serum Transferrin
A high transferrin level may occur when the body is trying to increase its ability to transport iron.
Possible causes include:
Iron deficiency
Iron deficiency anemia
Pregnancy
Estrogen-containing medications, in some cases
A high transferrin level is commonly associated with iron deficiency, particularly when accompanied by low serum iron and low ferritin.
A low level of Serum Transferrin
A low transferrin level may occur when the body produces less transferrin or when transferrin is lost or affected by another condition.
Possible causes include:
Chronic inflammation
Liver disease
Malnutrition or inadequate protein intake
Nephrotic syndrome or other protein-losing conditions
Iron overload
Certain cancers or chronic illnesses
Important note
Serum transferrin should not be interpreted by itself when evaluating iron status.
It is usually interpreted together with:
Serum ferritin
Serum iron
TIBC or transferrin
Transferrin saturation (TSAT)
Complete blood count (CBC)
Other clinical findings
Inflammation can complicate interpretation because transferrin is a negative acute-phase protein and may decrease during inflammatory conditions. Therefore, a low transferrin level does not necessarily mean iron overload, and the complete iron profile should be considered.
Prefer to talk to someone first? Contact us to book.
