Evidence check: Pharmakogenetik Medicheck in the context of Müdigkeit

The question about a pharmacogenetic Medicheck for fatigue is understandable, but the evidence for routine use is weak. Fatigue is a multifactorial symptom caused by sleep deprivation, stress, diet, lack of exercise, or underlying conditions (e.g., anemia, thyroid disorders). Pharmacogenetic tests analyze gene variants affecting drug metabolism (e.g., CYP2D6, CYP2C19). In fatigue, they could theoretically help if medications like antidepressants or beta-blockers are the cause – yet clinical relevance is limited. Most studies show small effect sizes, and prospective data proving that test-guided dosing improves fatigue are lacking. The MyBody-X test is not specifically described for pharmacogenetics in fatigue in the provided context; available information refers to stress DNA tests without confirmed SNP panels. Therefore, the evidence grade is 'unclear'. A medical workup for fatigue (including blood count, ferritin, thyroid) is more appropriate before genetic testing.