What to watch with Ferritin Eisenmangel and Müdigkeit?

When looking at ferritin, iron deficiency, and fatigue, key points: Ferritin reflects iron stores – levels below 30 µg/L indicate depleted stores, even if hemoglobin is normal (latent iron deficiency). Fatigue can occur with ferritin below 50–100 µg/L, especially in women, athletes, or after blood loss. However, ferritin is an acute-phase reactant: inflammation, infection, or liver disease can falsely elevate it, masking true deficiency. Therefore, CRP should be measured alongside. A consumer test (e.g., VitalCheck Complete) measures ferritin, but without clinical interpretation and complementary markers (transferrin, CRP, hemoglobin), results can be misleading. Iron deficiency without anemia is a well-established cause of fatigue (evidence: human-strong). Caution: supplementing iron without confirmed deficiency risks overload (hemochromatosis). Persistent fatigue with low ferritin warrants medical workup for underlying causes (e.g., blood loss, celiac disease, diet).