wie lange vor allergietest keine antihistaminika — what are common causes?

The question about how long to stop antihistamines before an allergy test is clinically well-established: for skin prick testing, antihistamines should be discontinued 3–7 days beforehand (short-acting: 3 days; long-acting: up to 7 days). This is necessary because antihistamines block histamine release and can cause false-negative results. Common causes of allergies (the 'common causes' asked about) include pollen (grasses, trees, weeds), dust mites, animal dander, mold, insect venom, and foods (e.g., peanuts, milk, eggs). The provided context data contain no specific information on antihistamine washout periods or allergy testing; they focus on genetic variants (e.g., TERT, IL-6, ALDH2) with weak associations to inflammation or metabolism. These genetic insights are not relevant for acute test preparation. The evidence for washout times is based on clinical practice and guidelines, not on the sources given here. Therefore, the evidence level is 'practice'. Note: Always consult a physician for individual recommendations, as specific medications and test protocols may vary.