Quick answer: Transferrin is the protein made by the liver that carries iron through the blood to the bone marrow and other tissues. Transferrin rises when the body needs more iron and falls with inflammation, liver disease or malnutrition. It is interpreted alongside serum iron, ferritin, TIBC and transferrin saturation.
What is Transferrin?
Transferrin is a protein made by the liver that binds iron and delivers it to cells, especially the bone marrow, where red blood cells are made. This marker is part of the Healthspan Assessment panel available to my 1-on-1 patients.
Why Transferrin matters
- Iron delivery to tissues
- Protects the body from free iron, which causes oxidative stress
- Reflects iron needs and liver protein production
Understanding your result
Reference ranges vary by lab, age and sex. Your provider interprets your result against the lab’s range and your overall picture, rather than chasing a single number. Functional labs are optional. They can be helpful in more complex cases, and in my practice they are available only to patients working 1-on-1 with me.
What low Transferrin can mean
- Inflammation or chronic illness
- Liver disease
- Protein malnutrition
- Kidney conditions that cause protein loss
What high Transferrin can mean
- Iron deficiency
- Pregnancy
- Estrogen-containing birth control
What affects Transferrin
- Iron status
- Liver health and protein intake
- Inflammation
- Hormones
Ways to support healthy levels
- Adequate protein intake
- Correct iron deficiency if present (see serum iron)
- Support liver health and address inflammation
Transferrin and healthy aging
By keeping iron safely bound, transferrin limits the oxidative stress that free iron can cause, which protects DNA and mitochondria over time.
Related tests and articles: ferritin, TIBC.
When to see a naturopathic doctor
- Fatigue, hair loss, restless legs or shortness of breath with exercise
- Heavy periods, pregnancy or a plant-based diet
- Abnormal iron results you want explained
- A family history of hemochromatosis
See a medical provider promptly for chest pain, fainting, a racing heart, black or bloody stools, or very heavy bleeding.
Want help making sense of your labs?
A free 15-minute consultation with Dr. Kneessi. No cost, no obligation. In-office in Odenton, MD or by telehealth.
Frequently asked questions
What does high transferrin mean?
It often means the body needs more iron.
What does low transferrin mean?
It can reflect inflammation, liver disease or low protein.
Is transferrin the same as ferritin?
No. Transferrin carries iron in the blood; ferritin stores it.
Can diet affect transferrin?
Protein and iron intake both influence transferrin levels.
Sources
This article is for educational purposes only and is not medical advice. It does not replace an individual evaluation. Talk with your healthcare provider before starting supplements or changing medications, especially if you are pregnant, nursing, or managing a health condition.
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