Your lab report shows a ferritin of 25. The reference range says 12-300 is “normal.” Your doctor says it’s fine.
But you’re tired all the time. Your hair is thinning. You can’t focus.
Here’s the problem: the “normal” range on your lab report isn’t the same as the optimal range.
Ferritin levels chart
| Ferritin Level | Status | What It Means |
|---|---|---|
| Below 12 | Deficient | Your iron stores are depleted. Supplementation usually needed. |
| 12-30 | Borderline low | Functionally low for many people. Symptoms common. Worth discussing with doctor. |
| 30-100 | Optimal | Good range for most adults. Enough iron for daily needs. |
| 100-200 | Normal-high | Still fine, but monitor if trending upward. |
| 200-300 | High | May indicate inflammation, liver issues, or iron overload. |
| Above 300 | Elevated | Needs investigation. Could be hemochromatosis or chronic inflammation. |
Why “normal” isn’t enough
The lab reference range (12-300) is based on the statistical distribution of the population. It includes everyone from healthy athletes to people with chronic illness. Being “in range” just means you’re not in the bottom 2.5% or top 2.5% of the population.
But functional iron deficiency — where your body doesn’t have enough iron to function optimally — can occur even when ferritin is technically “normal.” A cutoff of 30 ng/mL is about 92% sensitive and 98% specific for iron deficiency (AAFP) — far more useful than the lab’s floor of 12–15, which the WHO uses only to define outright depletion (WHO guideline, NCBI).
Symptoms of low ferritin
- Fatigue and low energy
- Brain fog and difficulty concentrating
- Hair thinning or loss
- Cold hands and feet
- Restless legs, especially at night
- Shortness of breath during exercise
- Brittle nails
- Pale skin
Who’s at risk
- Women with heavy periods — monthly blood loss depletes iron stores
- Vegetarians and vegans — plant-based iron is less bioavailable
- Endurance athletes — iron loss through sweat and foot-strike hemolysis
- People with digestive issues — celiac, Crohn’s, or gut inflammation
- Frequent blood donors — each donation removes ~200-250mg of iron
What to do
- Get a full iron panel — not just ferritin, but also serum iron, TIBC, and transferrin saturation
- Track over time — a single number is a snapshot; trends tell the story
- Talk to your doctor — if ferritin is below 30 and you have symptoms
- Don’t self-supplement — too much iron is dangerous. Get tested first.
References
- Short MW, Domagalski JE. Iron Deficiency Anemia: Evaluation and Management. American Family Physician (AAFP).
- World Health Organization. WHO guideline on use of ferritin concentrations to assess iron status (NCBI).
- National Institutes of Health, Office of Dietary Supplements. Iron — Health Professional Fact Sheet.
This article is for education and isn’t medical advice. Discuss your results with a qualified clinician.
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