Stuhlprobe: can a DNA test help?

A DNA test on a stool sample can help analyze the gut microbiome by sequencing bacterial DNA to identify species and their relative abundance. Such tests provide insights into microbial diversity and may indicate dysbiosis. However, clinical utility is limited: there are no standardized reference ranges for a 'healthy' microbiome, and results fluctuate with diet, medications, and lifestyle. Human genetic testing (e.g., for lactose intolerance or celiac risk) is done from saliva or blood, not stool. For colorectal cancer screening, specialized stool DNA tests (e.g., FIT-DNA) exist but require a doctor's prescription. Bottom line: a commercial microbiome DNA test can offer general orientation but is not diagnostic. The evidence is mostly mechanistic and mixed with marketing. If you have specific symptoms, consult a physician.