wie lange vor allergietest cetirizin absetzen — which blood markers matter?

The question about discontinuing cetirizine before an allergy test and which blood markers matter is medical and not directly addressed by the provided context. General clinical practice: For skin prick tests, cetirizine (an antihistamine) should be stopped 3–7 days prior, as it can suppress the wheal-and-flare reaction. For blood tests (specific IgE), discontinuation is usually unnecessary because antihistamines do not acutely alter IgE levels. Relevant blood markers include: specific IgE to allergens, total IgE, eosinophil count, and possibly tryptase (for mast cell disorders). Evidence is based on clinical guidelines and practice, not the provided sources. Caveat: Always consult a physician for personalized advice, as test protocols and individual health conditions vary. The DNA tests mentioned in the context are not relevant to this acute pharmacological question.