Evidence check: Stuhlprobe in the context of gut health

Stool sample tests (microbiome tests) measure bacterial composition and diversity. However, clinical validation is limited: they can show imbalances but cannot diagnose disease. The term 'healthy gut' is not scientifically well-defined due to high interindividual variability. Evidence on diet and gut flora is mostly observational and mechanistic; large randomized trials are lacking. Prebiotic fibers and fermented foods support beneficial bacteria, but individual responses vary greatly. For children, pediatric reference ranges are absent, so medical consultation is recommended before testing. Caveat: No quick fixes – dietary consistency matters more than any single superfood. Overall, the utility of stool tests for healthy individuals without symptoms is questionable; they may satisfy curiosity but should not drive clinical decisions alone.