What role does Eisen-Ferritin Selbsttest play in fatigue?

The iron-ferritin self-test measures ferritin, a marker of iron stores, in capillary blood. Low ferritin is a well-documented cause of fatigue because iron is critical for hemoglobin synthesis and mitochondrial energy production. However, the self-test has limitations: ferritin is an acute-phase reactant, so inflammation can falsely elevate levels, masking true deficiency. Also, reference ranges vary, and a single ferritin value without clinical context (e.g., hemoglobin, transferrin saturation, CRP) is insufficient for diagnosis. The test may serve as a screening tool but should not replace professional evaluation. Over-reliance could lead to unnecessary iron supplementation (risky in hemochromatosis) or missed underlying conditions. Evidence for the ferritin–fatigue link is human-strong; evidence for self-test accuracy in real-world settings is practice-based and moderate. Users should interpret results cautiously and consult a physician.