Health · Medical Research · 2 hrs ago
Ferritin testing can reveal low iron before anemia develops
Ferritin testing can reveal low iron stores before anemia appears.
Ferritin is a protein that stores iron, and its level in the blood helps estimate the body's reserves.
The American Society of Hematology issued its first official guidance on ferritin thresholds in September 2026, with different recommendations for adults, children, pregnant people and others.
Low iron can cause fatigue, weakness, dizziness and trouble concentrating, even when anemia has not been confirmed.
Inflammation or infection can raise ferritin and hide low iron, so one test result cannot establish a diagnosis.
Clinicians may compare it with blood counts and other iron tests, and reference ranges can vary by laboratory and age.
A healthcare professional must interpret the result alongside a person's symptoms and medical history.
Ferritin testing can reveal declining iron stores before hemoglobin levels change and anemia develops.
A low ferritin result can be relevant to symptoms such as fatigue, weakness, dizziness and difficulty concentrating, even without confirmed anemia.
The result is not a diagnosis on its own and should be interpreted alongside a person’s clinical history and other blood tests.
Inflammation or infection can raise ferritin and obscure low iron stores.
The American Society of Hematology issued its first official guidance on ferritin thresholds in September 2026.
- Who
- The American Society of Hematology and the US National Institutes of Health Office of Dietary Supplements discuss ferritin testing.
- What
- Ferritin testing can indicate low iron stores before anemia develops.
- When
- The American Society of Hematology published its first official ferritin-threshold guidance in September 2026. The article was published on November 4, 2026.
- Where
- Not stated
- Why
- Ferritin can show declining iron stores before hemoglobin or hematocrit changes, helping assess possible iron deficiency.
This story does not have two clearly opposing sides.
The American Society of Hematology published its first official guidance on ferritin thresholds for diagnosing iron deficiency.
Infobae published an article explaining how ferritin testing can detect low iron stores before anemia develops.
- Ferritin
- A protein that stores iron and provides an estimate of the body’s iron reserves
- NIH threshold
- Below 30 micrograms per liter can suggest iron deficiency
- NIH anemia threshold
- Below 10 micrograms per liter can indicate iron-deficiency anemia
- ASH adult threshold
- 30 nanograms per milliliter or less can indicate iron deficiency in adults, people who menstruate and pregnant people
- ASH higher-risk threshold
- 50 nanograms per milliliter or less for some higher-risk groups, including people with heavy menstrual bleeding