Evidence check: Eisen-Ferritin Selbsttest in the context of Stress

The iron-ferritin self-test in the context of stress has weak scientific support. Ferritin is an acute-phase protein that can rise due to inflammation, infection, or stress, independent of actual iron stores. A self-test typically measures only ferritin, not CRP, transferrin, or soluble transferrin receptor, which are needed to differentiate true iron status from stress-induced changes. Chronic stress may elevate ferritin via cortisol and inflammatory pathways, potentially masking functional iron deficiency. Evidence for a direct causal link between everyday stress and ferritin levels is limited; no validated cut-offs exist for stress-related alterations. Furthermore, most direct-to-consumer tests lack independent clinical validation. Users should treat such tests as rough guidance, not medical diagnosis. For stress symptoms or suspected iron deficiency, a full iron panel with inflammatory markers (CRP) under medical supervision is recommended. Evidence grade: mechanistic/unclear.