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Blood test information

Transferrin Blood Test

Measures levels of a protein produced in the liver that transports iron into the blood.

Result: 1 day Code: 84466
382.50 

Description of the blood Analysis: 

Transferrin is the primary protein in your blood that binds to iron and transports it throughout the body. Think of it as a “delivery truck” for iron. It is produced by the liver and its main job is to carry iron from the intestines (where it is absorbed) or from broken-down red blood cells to the bone marrow (where new blood cells are made) or to storage sites like the liver.

What Does the Analysis Represent?

  • Goal: To evaluate the body’s ability to transport iron and to help distinguish between different types of anemia.
  • Main Application: Diagnosing iron deficiency, monitoring liver function, and assessing nutritional status.
  • Biological Process: It reflects the body’s iron needs. When iron stores are low, the liver produces more transferrin to try and “catch” every available molecule of iron. When iron stores are full, transferrin production decreases.

Recommendations for the Test (General)

  • Fasting: Mandatory. Fasting for 8–12 hours is required because transferrin levels are closely tied to serum iron, which fluctuates after eating.
  • Timing: Like all iron-related tests, it is best performed in the morning.
  • Material: Venous blood (serum).

What Can Affect the Results?

  • Estrogen: Pregnancy or the use of oral contraceptives (birth control pills) can significantly increase transferrin levels.
  • Inflammation: Transferrin is a “negative acute-phase reactant,” meaning its levels drop during acute infection, inflammation, or after surgery.
  • Liver Health: Since the liver produces transferrin, severe liver disease (like cirrhosis) will cause levels to fall.
  • Nutrition: Severe protein malnutrition can lead to low transferrin levels because the body lacks the building blocks to make the protein.

When to Take the Test?

  • Suspected Anemia: If you have low hemoglobin and your doctor needs to know if the cause is lack of iron.
  • Abnormal Iron Results: To calculate the “Transferrin Saturation” percentage.
  • Chronic Illness: To differentiate between iron-deficiency anemia and “anemia of chronic disease” (where iron is present but the body can’t move it).
  • Liver Monitoring: As part of a broader assessment of liver synthetic function.

How to Interpret the Results?

Important: Transferrin levels must be interpreted by a licensed physician as this protein is the primary carrier of iron in the blood. High Transferrin: Typically indicates that the body is deficient in iron; the liver produces more of this protein to try and capture every available bit of iron for the body. Low Transferrin: May suggest liver disease (where the protein is produced), malnutrition, or an inflammatory condition that interferes with protein synthesis. Interpretation: A doctor will often look at this value alongside serum iron and ferritin to determine if an anemia is due to lack of iron or a chronic illness.

Possible Further Investigations

  • TIBC (Total Iron-Binding Capacity): This test is often used interchangeably with transferrin, as it measures the same transport capacity.
  • Transferrin Saturation: A calculation: $(Serum Iron / TIBC) \times 100$. This tells you what percentage of the “trucks” are actually carrying iron.
  • Ferritin: To see if the “warehouse” (iron stores) is empty.
  • Soluble Transferrin Receptor (sTfR): A specialized test to detect iron deficiency in patients who also have chronic inflammation.

When Does the Next Step Make Sense? 

The next step is necessary if transferrin is high, as this almost always confirms that your body is struggling with an iron deficit. If transferrin is low despite symptoms of fatigue, it often points to a more complex issue like chronic inflammation or liver stress, requiring a deeper look into your overall health markers.

👉 If necessary, you can discuss the results of the analysis with a specialist, such as a Hematologist (Doctors – TAMC), Gastroenterologist (Doctors – TAMC). 

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Tel Aviv Medical Clinic

Weizman st. 14, Tel Aviv, Israel

972-7337-46844

972-5233-73108

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