Myths vs facts: Eisen-Ferritin Selbsttest and Schlaf

Myth: An iron-ferritin self-test alone can reliably tell if your sleep is affected by iron deficiency. Fact: Ferritin is an acute-phase reactant; it can be falsely elevated during inflammation, masking a true deficiency. Sleep is influenced by many pathways (circadian genes, cortisol, melatonin), not just iron. While low ferritin is linked to restless legs syndrome and poor sleep quality, the evidence is moderate and mostly observational. Self-tests (e.g., finger-prick) may give a rough estimate but lack the precision of venous blood panels (including transferrin saturation, soluble transferrin receptor). Without clinical context, you risk misinterpreting results and taking unnecessary iron supplements, which can cause oxidative stress and organ damage. For sleep issues, a comprehensive workup (sleep diary, actigraphy, clinical labs) is more appropriate. Bottom line: self-tests are screening tools, not diagnostic. Evidence: human-moderate.