Myths vs facts: Stuhlprobe and Allergie

The question of myths vs facts regarding stool tests and allergies is important. A common myth is that a stool test can directly diagnose food allergies or 'leaky gut'. In reality, there is no validated scientific basis for such claims – they are largely marketing. A stool test can reveal gut microbiome composition, but it cannot diagnose an allergy. For celiac disease, specific blood tests (tTG-IgA) and possibly a duodenal biopsy are required, not stool. Histamine intolerance (DAO deficiency) is supported by exploratory studies (PMC12249752), but not by commercial stool tests. Genetic tests for lactose intolerance show only a predisposition, not current intolerance. Bottom line: stool tests are not suitable for allergy diagnosis; they may provide hints of dysbiosis associated with allergies, but no causality. Consult a physician for symptoms.