Mediki
TIBC blood test: what your result means
TIBC estimates how much iron the blood can bind through transferrin. It helps interpret iron status with ferritin and serum iron.
- Category
- Iron status
- Standard unit
- mmol/L
- Reported in
- mmol/L, µmol/L, µg/dL, µg/100mL, µg%, µg/L and more
What does high TIBC mean?
Higher values may suggest increased binding capacity, often seen in low-iron patterns. What counts as high depends on the reference range printed on your lab report, because ranges differ between laboratories.
What does low TIBC mean?
Lower values may suggest lower transferrin binding capacity. What counts as low depends on the reference range printed on your lab report, because ranges differ between laboratories.
TIBC units and conversion
Mediki shows TIBC in mmol/L. Labs may report it in other units; Mediki converts them automatically so results from different labs line up on one chart.
| Unit on your report | Convert to mmol/L | Convert back |
|---|---|---|
| µmol/L | 1 µmol/L = 0.001 mmol/L | 1 mmol/L = 999.9 µmol/L |
| µg/dL, µg/100mL, µg% | 1 µg/dL = 0.0001791 mmol/L | 1 mmol/L = 5,584 µg/dL |
| µg/L, ng/mL | 1 µg/L = 1.791 × 10-5 mmol/L | 1 mmol/L = 55,840 µg/L |
| mg/L | 1 mg/L = 0.01791 mmol/L | 1 mmol/L = 55.84 mg/L |
Convert a value from your report with the blood test unit converter.
Why track TIBC over time?
A single TIBC result is a snapshot. Comparing it with your earlier tests shows whether a value is stable, slowly drifting, or responding to a change in treatment or lifestyle, which is often more useful than one number on its own.
Read our guide on how to read blood test results to understand reference ranges, flags and units.
Following TIBC as part of a panel? See the ferritin and iron tracker.
Track your TIBC results in one chart
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Medical disclaimer: This page is general information, not medical advice. Reference ranges differ between laboratories, and only a doctor can interpret your results in the context of your health.