The Marker You're Missing: Ferritin
Your clue to iron and inflammation, in one marker
Levels <[email protected]>
Levels promotes understanding of the biomarker ferritin, explaining its role in storing iron and indicating inflammation. The company highlights the complexity of interpreting ferritin levels, which can be elevated due to either iron overload or inflammation. Levels provides guidance on reading ferritin results and determining healthy ranges.
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The Marker You're Missing: Ferritin
Why ferritin isn't as simple as an iron test
Ferritin is unusual among biomarkers because the same elevated number can mean two almost opposite things: too much stored iron, or inflammation with completely normal iron. It's the protein that stores iron in your body, and because it's more stable day-to-day than a standard iron test, it gives a better read on your long-term reserves. But your body also raises ferritin on purpose during illness or inflammation, pulling iron away from bacteria and viruses that need it to multiply. That means a high result doesn't automatically mean iron overload, and a normal result doesn't always rule out a problem either. Here's how to actually read your number.
Button More than an iron test →
The Basics
What it is
Ferritin is the protein that stores iron in your liver, spleen, and bone marrow, and it reflects your long-term iron reserves better than a same-day iron blood test does.
Why it matters
It does double duty as both an iron marker and an inflammation marker, since your body deliberately raises ferritin during infection or inflammation regardless of how much iron you actually have. Reading it alongside a marker like CRP is usually what tells you which one you're looking at.
Healthy range
Roughly 16 to 154 ng/mL for women aged 19 to 40, and 38 to 380 ng/mL for men aged 19 to 59; ranges shift further with age.
What moves it
Vegetarian or vegan diets, and iron-blocking foods like tea or coffee taken with meals, tend to lower it; pregnancy, alcohol, liver disease, and inflammation all tend to raise it. Recent infection, intense exercise, or dehydration can also temporarily skew a single reading.
When to test
Consider testing if you have unexplained fatigue, hair loss, or restless legs (which can point to deficiency), or joint pain and fatigue with a family history of hemochromatosis (which can point to overload). Otherwise, annual screening is typically enough once you know your baseline.
Button Read the full guide →
Looking to understand more about your metabolic health?
Explore our health news and advice site, Metabolic Insights
228 Park Ave South, PMB 63877, New York, NY 10003
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