What should I know about histaminintoleranz testen?

Histamine intolerance (HIT) is a controversial diagnosis. Symptoms like headache, diarrhea, and flushing overlap with many other conditions. Tests for HIT – such as blood levels of diamine oxidase (DAO), histamine, or genetic variants (e.g., DAO gene) – are offered by some labs, but scientific evidence is weak. DAO activity in blood does not reliably reflect intestinal histamine breakdown. Medications, gut diseases, or other food intolerances can also affect results. A positive test alone does not confirm HIT. Diagnosis relies primarily on a symptom-based food and provocation diary under medical supervision. Without clinical correlation, commercial tests are often misleading and may lead to unnecessary restrictive diets. Be cautious of labs that claim to diagnose HIT solely from genetic variants or blood markers. The overall evidence is unclear to marketing-driven. If you suspect HIT, consult an allergist or gastroenterologist before buying expensive tests or starting radical diets.