Ferritin 30 ng/mL in women — why "normal" hides iron depletion
A ferritin of 30 ng/mL in a woman sits at the very bottom of typical reference ranges (often 15–150 ng/mL female) and is well below the symptom-threshold of ~50 ng/mL that hair-loss, fatigue, restless-legs, and exercise-intolerance research literature consistently identifies. Ferritin is the body's iron storage protein; serum ferritin proportionally reflects total body iron stores. A reading of 30 means stores are depleted even though haemoglobin may still be normal — your iron is being prioritised for RBC production, leaving nothing for the hundreds of iron-dependent enzymes elsewhere (cytochromes, dopamine synthesis, thyroid peroxidase, collagen hydroxylation).
Reference ranges
| Standard reference — female | 15 – 150 ng/mL |
| Standard reference — male | 30 – 400 ng/mL |
| Symptom threshold (hair, fatigue) | < 50 ng/mL |
| Optimal target | 70 – 100 ng/mL |
| Iron overload concern | > 200 ng/mL |
What this marker measures
Serum ferritin reflects total body iron stores — primarily intracellular ferritin in liver, spleen, and bone marrow that has leaked into circulation in proportion to storage levels. It is the most sensitive single marker of iron status and changes long before haemoglobin does. Important caveat: ferritin is also an acute-phase reactant, so inflammation (CRP elevation), liver damage, or acute infection falsely elevate ferritin and can mask iron deficiency. In that context, a ferritin of 30 with elevated CRP is more depleted than the number suggests; a ferritin of 30 with clean inflammation markers is straightforward iron deficiency.
Why might it be low?
- ·Menstrual blood loss — by far the most common cause in pre-menopausal women
- ·Heavy/prolonged menstrual bleeding (menorrhagia)
- ·Pregnancy and lactation (iron transfer to fetus / milk)
- ·Inadequate dietary iron (vegan / vegetarian without intentional sourcing)
- ·Coeliac disease, IBD, or other malabsorption
- ·Helicobacter pylori gastritis (impaired iron absorption)
- ·GI blood loss (less common in young women — investigate if no menstrual cause)
- ·Frequent blood donation
Why might it be elevated?
- ·Inflammation (most common cause of "high ferritin" in clinical practice)
- ·Hereditary haemochromatosis (HFE C282Y)
- ·Repeated transfusions
- ·Liver disease
- ·Metabolic syndrome and hepatic steatosis
- ·Excess iron supplementation
FAQ
My haemoglobin is normal — why does ferritin matter?+
Iron has two roles: making haemoglobin and supporting hundreds of other iron-dependent processes (mitochondrial cytochromes, dopamine and serotonin synthesis, thyroid hormone production, collagen formation). The body protects haemoglobin first by depleting stores. By the time haemoglobin drops, stores are already empty. Ferritin catches the depletion phase, which is where hair loss, exercise fatigue, and brain fog typically appear.
What's the right iron supplement?+
Research literature now favours alternate-day dosing rather than daily, because daily iron raises hepcidin and blocks the next day's absorption. Ferrous sulphate, ferrous bisglycinate, or iron polymaltose 50–100 mg elemental iron every other day with vitamin C produces faster ferritin recovery than daily dosing. Recheck ferritin at 8–12 weeks. Discuss persistent iron deficiency with a clinician to rule out a bleeding source.
How long until I feel better?+
Hair-cycle effects (hair loss reversal) take 3–6 months because the hair growth cycle is slow. Energy, brain fog, and exercise tolerance often improve within 2–6 weeks of effective supplementation, well before ferritin reaches optimal range.
This page describes biomarker research and reference ranges for self-tracking and research-context discussion only. It is not medical advice, not a diagnosis, and not a substitute for a qualified physician. Take any concerns about your health to a clinician.
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