Is Ferritin useful for Müdigkeit?

Ferritin is a key biomarker for body iron stores. Low ferritin levels can indicate iron deficiency, which is a well-known cause of fatigue – even without anemia (non-anemic iron deficiency). However, ferritin is an acute-phase reactant: it can be elevated during inflammation, infection, or chronic disease, masking true iron deficiency. Therefore, ferritin should be interpreted alongside other markers like transferrin saturation, CRP, and complete blood count. An isolated low ferritin (<30 ng/ml) is a strong indicator of iron deficiency and can explain fatigue. High ferritin (>200–300 ng/ml) may point to hemochromatosis, inflammation, or metabolic syndrome – all of which can also cause fatigue. So ferritin is useful but not sufficient as a standalone test. For persistent fatigue, a medical workup is recommended. The evidence linking ferritin to fatigue is strong (human-strong), but it is based on general clinical knowledge, not on the specific context provided.