Is Zöliakie Test useful for Blutzucker?

A celiac test (e.g., tTG-IgA or HLA-DQ2/DQ8) is not directly useful for general blood sugar management. It becomes relevant if celiac disease is suspected – an autoimmune condition triggered by gluten that can cause intestinal damage and nutrient malabsorption. Untreated celiac disease can impair blood sugar regulation, especially in people with type 1 diabetes, where co-occurrence is elevated. However, for type 2 diabetes or prediabetic states without gastrointestinal symptoms, a celiac test offers no added value for blood sugar control. Genetic tests for celiac risk variants (HLA-DQ2/DQ8) indicate lifelong predisposition, not active disease. The evidence for routine celiac screening in unselected blood sugar issues is weak. Instead, established markers such as fasting glucose, HbA1c, and possibly an oral glucose tolerance test should be prioritized. A celiac test is only warranted when symptoms or known type 1 diabetes suggest it.