wie lange vor allergietest cetirizin absetzen — can a DNA test help?

Cetirizine is a second-generation antihistamine. Before an allergy skin prick test, it should generally be discontinued 3–7 days prior (depending on the specific drug and medical advice) because it suppresses the histamine skin response and can cause false-negative results. A DNA test cannot replace this preparation. While it may identify genetic risk variants for allergies (e.g., to pollen or foods), it cannot assess current sensitization or the need to stop medication. Evidence for DNA-based allergy prediction is weak (ranging from 'marketing' to 'human-moderate'), and clinical practice relies on standardized skin or blood tests (sIgE). A genetic test might offer complementary clues but is not a substitute for proper medical history and test preparation. Safety note: Never stop cetirizine without consulting your doctor, especially if you have seasonal allergies or are on long-term therapy.