Ferritin: Reference Ranges, Low & High Levels, and What They Mean
Ferritin reference ranges, what low and high iron-store levels mean, and what affects your result. Educational biomarker guide from EnnuLife.
In This Guide
If you have been feeling drained or your bloodwork hinted at low iron, a ferritin test can help explain what is going on. Ferritin is a protein that stores iron in your body, and the ferritin blood test is the single best indicator of your iron stores. It is widely used to look into fatigue, anemia, and iron overload, and to track iron levels over time.
What Ferritin Measures
Most of the iron in your body is already in use, but some is held in reserve inside ferritin. The amount of ferritin in your blood closely mirrors how much stored iron you have. A low ferritin points to depleted iron, and a high ferritin points to iron overload or, sometimes, inflammation. Because ferritin also rises with inflammation and illness, your clinician reads it alongside other iron studies when the picture is not clear.
Reference Ranges for Ferritin
Ferritin is reported in nanograms per milliliter (ng/mL). Ranges differ by sex and lab:
| Group | Commonly reported reference range |
|---|---|
| Adult males | 30–400 ng/mL |
| Adult females | 15–150 ng/mL |
Cutoffs vary from lab to lab, and clinicians often treat a low-normal ferritin as meaningful in someone with symptoms. Read your result against the range printed on your own report.
Why Ferritin Is Tested
- Looking into fatigue, weakness, or shortness of breath
- Diagnosing and monitoring iron-deficiency anemia
- Evaluating restless legs, hair shedding, or poor exercise tolerance
- Screening for iron overload
What Low Ferritin Can Indicate
Low ferritin reflects depleted iron stores, the most common cause of iron-deficiency anemia. It can come from blood loss (including heavy periods), low dietary iron, poor absorption, or pregnancy. People often report fatigue, pale skin, shortness of breath, brittle nails, hair shedding, and trouble concentrating.
What High Ferritin Can Indicate
High ferritin can reflect true iron overload (such as hereditary hemochromatosis), but it also rises with inflammation, infection, liver conditions, or heavy alcohol use. For that reason, a high ferritin is read together with other iron studies and your clinical context rather than on its own.
Factors That Affect Your Result
- Inflammation or recent illness can raise ferritin apart from your iron stores
- Menstrual blood loss
- Diet and iron supplementation
- Pregnancy
- Liver health and alcohol intake
How the Test Is Performed
Ferritin is measured from a routine blood draw, often along with a complete blood count and other iron studies. You usually do not need to fast.
Frequently Asked Questions
What is a good ferritin level?
Many labs use roughly 30–400 ng/mL for men and 15–150 ng/mL for women, but the range on your report and your symptoms matter most.
Can low ferritin cause fatigue without anemia?
Yes. Iron stores can be low before anemia develops, and some people report fatigue at low-normal ferritin. Talk through your result with your clinician.
Does inflammation affect ferritin?
Yes. Ferritin rises with inflammation, which is why it is read alongside other markers.
Understanding Your Result
At EnnuLife, ferritin is reviewed alongside related blood markers and your overall health picture, with any treatment guided by a qualified clinician. Take our free health assessment to begin understanding your results.
This page is for general educational purposes only and is not medical advice. Reference ranges vary by laboratory and individual. It is not intended to diagnose, treat, or replace consultation with a qualified healthcare provider.
Medically Reviewed
Content reviewed by EnnuLife's medical team to ensure accuracy and adherence to current clinical guidelines.
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