wie lange vor allergietest cetirizin absetzen — what does this mean exactly?

The question asks: How long before an allergy test (usually a skin prick test or intradermal test) should you stop taking cetirizine? Cetirizine is a second-generation antihistamine that blocks histamine release and can suppress the skin reaction to allergens. If not discontinued in time, the test may yield a false-negative result, potentially missing an allergy. The recommended washout period varies by test type and physician instruction, typically 3 to 7 days. For skin tests, a pause of 5–7 days is often advised; for longer-acting antihistamines (e.g., desloratadine), even longer. Important: Do not stop abruptly without consulting a doctor, especially if you have chronic urticaria or severe allergies. The evidence for this recommendation is based on clinical practice and guidelines, not on direct study data from the provided context. Therefore, the evidence level is 'practice'. Note: The given context contains no specific information about cetirizine or allergy testing, so the answer relies on general medical knowledge.