Combine ferritin with transferrin saturation to judge whether your iron stores are empty, borderline or adequate.
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Why two numbers are needed
Ferritin reflects stored iron but rises with inflammation, which can mask deficiency. Transferrin saturation shows how much iron is actually being delivered to tissues, so the pair is read together.
The decision rules
- Ferritin under 30 ng/mL means depleted stores in virtually all guidelines
- Ferritin 30 to 100 with saturation under 20 percent suggests functional deficiency
- Higher ferritin with adequate saturation indicates replete stores
Symptoms to connect
Fatigue, restless legs, hair shedding, brittle nails and ice craving often appear before anemia develops, so normal hemoglobin does not exclude low iron.
What to do
Confirm with a full iron panel and discuss oral or intravenous repletion with your clinician rather than self prescribing.