What your ferritin level means

Lab marker guide · Updated June 2026

Understanding lab results

What ferritin measures

Ferritin is a protein that stores iron inside your cells and releases it when needed. The amount circulating in your blood roughly mirrors your total iron reserves, which is why it's the go-to test for assessing iron status — more sensitive for early iron deficiency than a standard hemoglobin reading.

Typical reference ranges

Ranges differ between labs and by sex, but a common reference is:

• Men: ~30–400 ng/mL
• Women: ~15–150 ng/mL

One nuance clinicians often flag: a ferritin under ~30 ng/mL can indicate depleted iron stores even when it's still inside the "normal" band. Always read your value against the range printed on your report.

What low ferritin means

Low ferritin almost always points to depleted iron stores — the earliest stage of iron deficiency, often before anemia shows up. Common drivers include blood loss (including heavy periods), low dietary iron, poor absorption, or pregnancy. Symptoms can include fatigue, hair shedding, and cold intolerance.

What high ferritin means

High ferritin is trickier, because ferritin is also an acute-phase reactant — it climbs with inflammation. So elevated ferritin can mean:

• Iron overload (e.g. hemochromatosis) — but this is the less common cause
• Inflammation or infection — very common
• Liver conditions or heavy alcohol use
• Metabolic issues

Because of this, a high ferritin alone doesn't diagnose iron overload — it needs context (and usually additional iron studies).

Why the trend matters

A single ferritin value is a snapshot. The trend over time is what's informative: stores rebuilding after iron supplementation, a slow rise worth investigating, or a marker that moves with your inflammation. This is exactly the kind of pattern that's invisible when results sit in separate PDFs — and obvious when they're in one timeline. See tracking lab results over time and how to read your blood test results.

When to talk to a doctor

Any ferritin result well outside your lab's range — high or low — is worth discussing with a clinician, who can order follow-up iron studies and interpret it against your symptoms and history. For more on making sense of your panels, browse the rest of the Quanome blog.

Frequently asked questions

What does ferritin measure?

Ferritin is a protein that stores iron, so a blood ferritin test estimates how much iron your body has in reserve. Low ferritin usually means depleted iron stores; high ferritin can mean iron overload or, very commonly, inflammation.

What is a normal ferritin level?

Ranges vary by lab and sex, but a common reference is roughly 30–400 ng/mL for men and 15–150 ng/mL for women. Many clinicians consider ferritin under ~30 ng/mL suggestive of iron deficiency even when it's technically 'in range.' Always read against your own lab's range.

What does high ferritin mean?

High ferritin can reflect iron overload (such as hemochromatosis), but far more often it rises with inflammation, infection, liver issues, or heavy alcohol use, because ferritin is also an 'acute phase' marker. It needs interpretation in context, not in isolation.

Should I track ferritin over time?

Yes — a single value is a snapshot, but the trend tells the real story (e.g. iron stores recovering after supplementation, or creeping up over years). Tracking it alongside other markers is far more informative than one reading.