Myths vs facts: Eisen-Ferritin Selbsttest and Müdigkeit

Myth: A low ferritin result from a self-test proves that fatigue is caused by iron deficiency. Fact: Ferritin is an acute-phase protein that can be elevated during inflammation, infection, or liver disease – even when true iron deficiency exists. A self-test typically measures only ferritin, not transferrin, hemoglobin, or inflammatory markers like CRP. Fatigue has many causes: poor sleep, thyroid disorders, vitamin D deficiency, stress, or chronic inflammation. An isolated ferritin value without clinical context can be misleading. Moreover, self-tests may have lower accuracy than certified laboratory methods. If you suspect iron deficiency, consult a doctor for a complete blood count including ferritin, transferrin saturation, and CRP. The evidence linking low ferritin to fatigue is strong, but only within a full diagnostic workup. A self-test alone is insufficient for a reliable assessment.