wie viel stuhl für stuhlprobe — when to see a doctor?

The required stool amount for a sample depends on the specific test. For common tests like the fecal immunochemical test (FIT) or calprotectin, a pea- to hazelnut-sized amount (about 1–2 grams) is sufficient. For microbiome analyses (e.g., MyBody-X), a full scoop (approx. 5–10 grams) is often needed – always follow the kit instructions. You should see a doctor if you notice blood in stool (bright red or tarry), persistent diarrhea or constipation, unexplained weight loss, abdominal pain, or a sudden change in bowel habits. Also, if a home stool test (e.g., FIT) is repeatedly positive without a clear cause, medical follow-up (e.g., colonoscopy) is warranted. The question of sample quantity alone is not a reason to see a doctor – as long as you follow the instructions. Note: These recommendations are based on general medical practice, not on specific MyBody-X sources. When in doubt, consult your primary care physician.