Is Stuhlprobe useful for Müdigkeit?

Whether a stool test is useful for fatigue depends on the context. Stool (microbiome) tests are often marketed by consumer companies to explain low energy or exhaustion, but the scientific evidence is limited and mixed. While there is some research linking gut microbiota to mood and energy via the gut-brain axis, most studies are small, mechanistic, or animal-based. Clinically validated biomarkers for fatigue from stool samples do not exist. Fatigue has many causes—sleep deprivation, iron deficiency, thyroid disorders, depression, chronic infections—and a stool test cannot replace proper medical workup. Consumer tests frequently provide vague 'scores' without validated reference ranges. Conclusion: For general fatigue evaluation, a stool test is not evidence-based. If specific gastrointestinal conditions (e.g., celiac disease, inflammatory bowel disease) are suspected, a stool test may be indicated—but this should be physician-ordered.