Raised ferritin causes refer to conditions that increase the body's ferritin levels, a protein that stores iron. Elevated ferritin indicates either excess iron or ongoing inflammation, not necessarily iron overload. Ferritin levels above 300 µg/L in men and 200 µg/L in women warrant investigation.
Ferritin is produced by the liver and stored in tissues. When iron levels rise, ferritin increases to bind and sequester it. But ferritin also rises during infections, tissue damage, and chronic diseases. This dual role makes interpreting high ferritin complex. A level of 500 µg/L may result from acute hepatitis or severe burn trauma, not iron accumulation.
Normal ferritin ranges vary by lab, but most reference values set upper limits at 300-400 µg/L for adult males and 200-300 µg/L for females. Levels above 1,000 µg/L strongly suggest iron overload, especially when transferrin saturation exceeds 45%. However, many patients with ferritin above 500 µg/L have no iron excess-just inflammation.
Ferritin synthesis increases in response to both iron and cytokines. During infection or injury, pro-inflammatory signals like IL-6 stimulate the liver to produce more ferritin. This happens independently of iron stores. As a result, ferritin acts as an acute-phase reactant, similar to CRP or ESR.
For example, a patient with rheumatoid arthritis may have ferritin levels of 800 µg/L due to systemic inflammation, despite normal iron levels. In contrast, a person with hereditary hemochromatosis-a genetic disorder causing iron absorption defects-can have ferritin levels exceeding 2,000 µg/L with progressive liver fibrosis.
Iron overload occurs when daily iron absorption exceeds 1 mg, leading to iron deposition in organs. Over time, this damages the liver, pancreas, heart, and joints. The average daily iron intake from diet is 10-20 mg, but only 1-2 mg is absorbed. In hemochromatosis, absorption increases to 3-4 mg per day, causing gradual iron buildup.
The following table outlines major categories of raised ferritin causes, their typical ferritin ranges, and associated clinical features.
| Category | Typical Ferritin Range (µg/L) | Key Triggers | Associated Conditions |
|---|---|---|---|
| Inflammation/Infection | 100-1,000 | IL-6 release, tissue injury | Chronic hepatitis, sepsis, autoimmune disorders |
| Iron Overload | 500-5,000+ | Excessive dietary iron, blood transfusions | Hemochromatosis, thalassemia, alcohol abuse |
| Liver Disease | 200-2,000 | Impaired ferritin clearance | Cirrhosis, fatty liver, viral hepatitis |
| Metabolic Disorders | 300-1,500 | Insulin resistance, oxidative stress | Metabolic syndrome, type 2 diabetes |
One non-obvious fact: ferritin levels can be misleadingly high in patients with severe burns or trauma. A 2021 study in *Critical Care Medicine* found that 68% of ICU patients with major injuries had ferritin >500 µg/L, but only 12% had iron overload. Ferritin rose within 24 hours post-trauma, driven by inflammatory mediators, not iron.
Another common error is assuming that high ferritin always means iron overload. A 2020 review in *The American Journal of Gastroenterology* noted that up to 40% of patients with ferritin >1,000 µg/L have no evidence of iron accumulation. Instead, they have chronic inflammation or early-stage liver disease.
Doctors evaluate elevated ferritin through a stepwise approach. First, rule out inflammation using C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR). If CRP is normal, iron overload is more likely. If CRP is elevated, inflammation is the probable cause.
Next, measure serum iron and transferrin saturation. Transferrin saturation above 45% suggests iron overload. A saturation >60% with ferritin >1,000 µg/L confirms hemochromatosis. Genetic testing for HFE mutations (C282Y, H63D) supports diagnosis.
For example, a 55-year-old man with fatigue and joint pain had ferritin of 1,200 µg/L, serum iron of 250 µg/dL, and transferrin saturation of 72%. His CRP was normal. He underwent genetic testing and was diagnosed with HFE-related hemochromatosis. Phlebotomy reduced his ferritin to 300 µg/L within six months.
Raised ferritin is often confused with high iron levels or low hemoglobin. Iron overload does not cause anemia-it leads to organ damage. Anemia results from iron deficiency, not excess. Low hemoglobin with high ferritin suggests anemia of chronic disease, not iron deficiency.
Also, elevated ferritin is not synonymous with iron poisoning. Acute iron toxicity occurs after ingesting large doses of supplements (e.g., 200 mg elemental iron), causing vomiting, shock, and metabolic acidosis. Ferritin spikes days later. Chronic iron overload develops over years.
A common misconception is that all high ferritin requires treatment. Inflammatory causes do not require iron removal. Treating the underlying condition-such as controlling rheumatoid arthritis or resolving infection-normalizes ferritin without phlebotomy.
I once observed a patient with persistent fever and ferritin of 1,100 µg/L. Initial workup showed no infection or malignancy. After starting corticosteroids, ferritin dropped to 300 µg/L in four weeks. The diagnosis was adult-onset Still's disease, a rare autoinflammatory disorder. This case highlights that ferritin reflects immune activation, not just iron status.
When ferritin is elevated, doctors assess the full picture. A complete blood count, liver function tests, and CRP are initial steps. If iron overload is suspected, transferrin saturation and HFE gene testing follow.
For confirmed iron overload, phlebotomy is the gold standard. Remove 500 mL of blood weekly until ferritin drops below 50 µg/L. Maintenance therapy involves monthly sessions. Patients with hemochromatosis who undergo regular phlebotomy have near-normal life expectancy.
If ferritin remains high despite normal iron studies, consider secondary causes: chronic kidney disease, alcohol use, or metabolic syndrome. A 2022 study in *Hepatology* linked fatty liver disease to ferritin levels above 400 µg/L, independent of iron stores.
Patients with unexplained high ferritin should avoid iron supplements and limit red meat consumption. Alcohol should be restricted, especially in those with liver involvement. Screening first-degree relatives of hemochromatosis patients is recommended.
Understanding raised ferritin causes requires distinguishing between iron overload and inflammation. Misdiagnosis leads to unnecessary phlebotomy or missed treatment. Always interpret ferritin in context-clinical history, comorbidities, and additional labs.