warum bin ich so müde test — when to see a doctor?

The question 'why am I so tired' and whether a consumer test can answer it is common, but such tests – whether DNA-based or biomarker panels – are not diagnostic. The provided context shows these are marketed as lifestyle inspiration, not medical devices. Genetic variants (e.g., in MTHFR or CYP1A2) may have small effects on energy metabolism, but effect sizes are typically small and not clinically actionable. Chronic or unexplained fatigue has many possible causes: iron deficiency, thyroid dysfunction, sleep apnea, depression, or vitamin deficiencies. A home test cannot rule these out. You should see a doctor if fatigue persists for more than two weeks, is accompanied by other symptoms (weight change, shortness of breath, concentration problems), or interferes with daily life. A physician can order appropriate lab tests (CBC, ferritin, TSH, vitamin B12, vitamin D). A consumer test may serve as a conversation starter, not a diagnosis. Evidence: marketing/unclear.