Is APOE useful for Müdigkeit?

APOE (Apolipoprotein E) is primarily associated with Alzheimer's disease and cardiovascular risk, not directly with fatigue. There is no robust evidence that APOE genotyping is useful for evaluating tiredness. Fatigue has many causes: sleep disorders, iron deficiency, thyroid dysfunction, stress, vitamin D deficiency, blood sugar issues, or psychological factors. APOE ε4 carriers have an increased Alzheimer's risk, but fatigue is not an early symptom. A direct benefit for diagnosing or treating fatigue is not established. Some direct-to-consumer tests include APOE, but this is more marketing than evidence-based medicine. For persistent fatigue, it is better to check standard lab parameters (CBC, ferritin, TSH, vitamin B12, HbA1c) and lifestyle factors. APOE testing is not recommended for this purpose.