What to watch with Eisen-Ferritin Selbsttest and Sport?

When using an iron/ferritin self-test in the context of sports, several important considerations arise. Ferritin is a marker of iron stores, and athletes, especially endurance athletes, may be at risk for iron deficiency due to increased losses (sweat, hemolysis, gastrointestinal bleeding) and higher demands for oxygen transport. However, self-tests have limitations: they provide a single snapshot, may be affected by recent exercise (acute inflammation can raise ferritin), and do not replace a full clinical workup including hemoglobin, transferrin saturation, and inflammatory markers. Additionally, iron supplementation should not be started based solely on a self-test, as iron overload is also possible (e.g., hemochromatosis). It is crucial to interpret results in the context of training load, diet, and symptoms. A low ferritin (<30 ng/mL) may indicate depleted stores, but values between 30-100 ng/mL may still be suboptimal for athletes. Conversely, high ferritin (>200 ng/mL) could indicate inflammation or overload. Always consult a healthcare professional for personalized advice. The evidence for self-testing in sports is limited; most guidelines recommend periodic screening by a physician. Therefore, use self-tests as a screening tool, not a diagnostic one.