What role does Ferritin play in allergy?

Ferritin is an intracellular iron storage protein measured in blood to assess iron reserves. In allergy, ferritin has no direct diagnostic or pathophysiological role. However, iron status can indirectly influence immune function: iron deficiency impairs T‑cell activity and may modulate IgE production, while iron overload promotes oxidative stress and inflammation. Some studies report associations between low ferritin and increased allergy risk in children, but effect sizes are small and inconsistent. Ferritin is not included as an allergy marker in any MyBody-X test; their panels focus on nutrition, longevity, and intolerances (e.g., lactose, gluten), not specific allergy diagnostics. For allergy assessment, specific IgE tests or skin prick tests are required. Caveat: using ferritin alone as an allergy biomarker lacks evidence; values should be interpreted alongside inflammatory markers and clinical symptoms.