Myths vs facts: Ferritin and gut health

Myth: Ferritin is a direct marker of gut health. Fact: Ferritin is an iron storage protein; its serum level is influenced by inflammation, infection, liver disease, and iron loss. Low ferritin can indicate iron deficiency, which may result from impaired intestinal absorption (e.g., celiac disease, Crohn's disease, or after gastric bypass). High ferritin often reflects an acute-phase response and rises with inflammation, regardless of actual iron stores. Therefore, ferritin alone is not a specific marker for gut health. To assess gut issues, more specific tests such as stool analysis, endoscopy, or antibody tests (e.g., for celiac disease) are required. Evidence is based on clinical studies and guidelines (e.g., for iron deficiency anemia). Caveat: A normal ferritin level does not rule out gut disease. Interpretation must always consider the clinical context.