wie lange vor allergietest cetirizin absetzen — when to see a doctor?

The question of how long to stop cetirizine before an allergy test is clinically important, but the provided context does not contain specific data on this. Generally, antihistamines like cetirizine should be discontinued 3–7 days before a skin prick or intradermal test, as they can suppress the wheal-and-flare reaction. For blood tests (e.g., specific IgE), discontinuation is usually not required. The evidence is based on clinical practice guidelines, not on the given sources. A doctor's visit is essential to adjust medication individually, especially for children, pregnant women, or those on other drugs. Consumer genetic tests (e.g., for histamine metabolism) have limited predictive value and do not replace medical advice. Caution: abrupt discontinuation may worsen allergy symptoms. Always consult your allergist before stopping any medication.