What should I know about allergietest selber machen?

DIY allergy tests (e.g., from pharmacies or online) claim to detect food intolerances or allergies via hair, saliva, or blood samples at home. However, scientific evidence for such tests is weak to nonexistent. True allergies are IgE-mediated and require standardized lab methods (e.g., ImmunoCAP) plus medical interpretation. Many home tests measure IgG antibodies, which only indicate food exposure, not allergy. Genetic tests for allergies (e.g., SNPs like rs10246939) lack clinical relevance – genetic predisposition is complex and poorly predictive. The German Society for Allergology and Clinical Immunology (DGAKI) advises against such tests. If an allergy is suspected, consult an allergist for history, skin prick test, and possibly oral challenge. Home tests can lead to misdiagnosis, unnecessary diets, or delayed treatment. The provided context contains no validated studies on DIY allergy tests; evidence is rated as 'marketing'.