wie testet man eine glutenunverträglichkeit — what are common causes?

Testing for gluten intolerance requires a stepwise approach because symptoms (bloating, diarrhea, fatigue) overlap with many conditions. Common causes: 1) Celiac disease – an autoimmune disorder triggered by gluten in genetically susceptible individuals (HLA-DQ2/DQ8). Diagnosis involves serology (tTG-IgA, EMA) and duodenal biopsy. 2) Non-celiac gluten sensitivity (NCGS) – a diagnosis of exclusion after ruling out celiac disease and wheat allergy, confirmed by double-blind placebo-controlled gluten challenge. 3) Wheat allergy – an IgE-mediated reaction diagnosed via skin prick tests or specific IgE. Critical: Do not start a gluten-free diet before testing for celiac disease, as it can normalize antibodies and biopsy findings, leading to false negatives. Evidence is strong for celiac disease, moderate for NCGS. MyBody-X does not offer specific gluten intolerance tests; their gut microbiome analysis cannot diagnose celiac disease.