Vitamins & minerals
Transferrin Saturation
LOINC 14800-7 · %
Ranges
Reference range: 20–50 %
What it is
Transferrin saturation is the percentage of your iron-transport protein that is actually carrying iron — how "full" your iron taxis are.
Why it matters
It is a useful overall snapshot of iron availability, combining iron and TIBC into one number.
What high values can mean
A higher value can indicate iron overload and prompts further evaluation.
What low values can mean
A lower value is a common sign of iron deficiency.
How to improve it
For low saturation, iron-rich foods and, when advised, supplements help; pair with vitamin C for absorption.
Food & lifestyle
Iron-rich foods with vitamin C support iron status; the value follows your overall iron balance.
Preparing for the testFasting required
A blood test from iron studies; a morning, fasting sample may be preferred — follow your lab.
When to talk to a doctor
Discuss a high or low transferrin saturation with a doctor as part of the full iron panel.
Related markers
Sources
- MedlinePlus (NIH)
- Testing.com (AACC)
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
See your own values in context
Bllod turns your lab report PDFs into clear, tracked results — every marker organized, explained, and charted over time.