wie viel stuhl für stuhlprobe — can a DNA test help?

The question about how much stool is needed for a stool sample refers to a microbiological or parasitological test, not a DNA test. A DNA test analyzes your genetic information from saliva or blood, not the stool itself. For a stool sample (e.g., microbiome test), typically a pea- to hazelnut-sized amount is required – exact instructions are in the kit manual. A DNA test cannot help here, as it answers different questions (e.g., genetic predispositions). The evidence is purely practical: stool tests are established, but sample quantity varies by manufacturer. Follow your specific test kit's instructions.