Can Eisen-Ferritin Selbsttest help with Sport?

An iron/ferritin self-test can be useful for athletes to monitor iron status, as iron deficiency impairs performance (e.g., endurance, oxygen transport). However, the reliability of such home tests is limited: ferritin is an acute-phase reactant that can be falsely elevated during inflammation, infection, or after intense exercise. Many self-tests lack clinically validated reference ranges and may be affected by storage or handling errors. A low ferritin level may indicate iron deficiency, but diagnosis and treatment should be medically supervised – especially in athletes at higher risk (e.g., endurance athletes, women). Unnecessary iron supplementation can be harmful (e.g., oxidative stress, gastrointestinal issues). Evidence for the benefit of self-tests in sports is weak; no randomized trials show performance improvement from self-test-guided supplementation. Therefore, the test can provide a rough screening value but does not replace professional medical assessment. For serious athletic goals or symptoms like fatigue, declining performance, a doctor should be consulted.