Is Eisen-Ferritin Selbsttest useful for Müdigkeit?

A ferritin self-test can provide a clue about your iron stores, as ferritin reflects stored iron. Low ferritin (<30 ng/mL) is a well-established marker for iron deficiency, which can cause fatigue. However, fatigue is multifactorial—sleep deprivation, thyroid issues, vitamin D deficiency, and psychological factors also contribute. Therefore, a self-test is only one piece of the puzzle. Additionally, inflammation can falsely elevate ferritin, so a normal result does not rule out iron deficiency. The evidence for home self-tests is limited; they do not replace professional medical evaluation. If you have persistent fatigue, a doctor-ordered complete blood count, CRP, and ferritin test is more reliable. The self-test may serve as a preliminary indicator but should not be used alone for decision-making.