wieviel stuhl für stuhlprobe — what are common causes?

The question about the required stool amount for a stool sample and the common causes for such a test is valid but not addressed in the provided context. In general, for most commercial microbiome tests (including MyBody-X's), a pea- to hazelnut-sized amount (about 1–2 grams) from the first morning stool is sufficient, collected with the provided spoon or swab. The sample should not be contaminated with urine or water. Common reasons for a stool test include: evaluation of diarrhea, constipation, bloating, or abdominal pain; suspicion of inflammatory bowel disease (IBD), infections (bacteria, parasites), or food intolerances; and preventive gut health checks (microbiome analysis). Important: Sample collection and storage must follow the kit instructions exactly, otherwise results may be skewed. For medical symptoms, a doctor should always be consulted – self-tests do not replace a diagnosis. The evidence for the clinical relevance of microbiome self-tests is still limited („practice“ level).