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Editor-In-Chief: C. Michael Gibson, M.S., M.D. 
Transferrin saturation, measured as a percentage, is a medical laboratory value. It is the ratio of serum iron and total iron-binding capacity, multiplied by 100. For an explanation of some clinical situations in which this ratio is important, see Total iron-binding capacity. The three results are usually reported together.
- Serum iron: 60-170 mcg/dl
- TIBC: 240-450 mcg/dl
- Transferrin saturation: 20-50%
mcg/dl = micrograms per deciliter.
Laboratories often use different units and "normal" may vary by population and the lab techniques used. Look at the individual laboratory reference values to interpret a specific test (for instance, your own).