Zöliakie Test: when to see a doctor?

A home celiac test (e.g., IgA antibodies against tTG) can provide a preliminary indication but does not replace a medical diagnosis. A positive result must be confirmed by a blood test and a small intestine biopsy. A negative result does not rule out celiac disease, especially if there is IgA deficiency or if a gluten-free diet has already been started. See a doctor if you or your child have persistent symptoms such as diarrhea, abdominal pain, fatigue, growth issues, or skin rash. The doctor will measure specific antibodies (tTG-IgA, total IgA) and, if indicated, perform a biopsy. A gluten-free diet should only be started after a confirmed diagnosis, as it can skew test results. Caveat: home tests are screening tools, not diagnostic. Evidence for medical follow-up is strong (clinical practice).