Total Iron Binding Capacity
Iron Studies marker
TIBC
Total Iron Binding Capacity
Measures the maximum capacity of transferrin to bind iron. Elevated in iron deficiency, reduced in iron overload or chronic inflammation.
PED Notes
AAS-driven erythropoiesis plus regular blood donation creates high iron throughput. Each donation removes ~250mg of iron. The liver responds by producing more transferrin, raising TIBC. Interpret alongside ferritin, serum iron, and transferrin saturation — high TIBC + low ferritin + low TSAT confirms true iron deficiency (most common from donation). Low TIBC + high ferritin + low iron suggests anemia of chronic disease or inflammation (ferritin falsely elevated).
When high
When elevated (>82 umol/L — iron deficiency):
The body is upregulating transferrin production to capture more dietary iron:
Supplements:
- Iron Bisglycinate -- 25-50mg elemental iron/day (better absorbed, fewer GI side effects)
- Vitamin C -- 500mg taken with iron to enhance absorption
- Take iron on empty stomach; avoid calcium, coffee, and tea within 2 hours
- Lactoferrin -- 200mg/day, enhances iron absorption
For AAS users who donate blood:
- Supplement iron between donations to prevent iron-deficient erythropoiesis
- Target: ferritin >50 ug/L and TIBC within normal range before next donation
- Recheck iron studies 6-8 weeks after starting supplementation
- If TIBC remains elevated despite supplementation, consider extending donation interval or reducing AAS dose
When low
When low (<45 umol/L — possible iron overload or chronic disease):
- Low TIBC with high ferritin may indicate iron overload — investigate HFE gene for hereditary haemochromatosis
- Low TIBC with high ferritin but low serum iron suggests anemia of chronic disease (iron trapped in stores due to inflammation)
- Liver disease from oral AAS reduces transferrin synthesis, lowering TIBC
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