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

The recommended washout period for cetirizine before an allergy test depends on the test type. For a skin prick test, cetirizine should be stopped at least 3–7 days prior, as antihistamines can suppress the skin reaction. For an intradermal test, a longer pause of 5–7 days is often advised. For a blood test measuring specific IgE (sIgE), no washout is needed because antihistamines do not affect IgE levels in the blood. Key blood markers in allergy testing include: specific IgE (sIgE) to individual allergens, total IgE (tIgE) as a non-specific indicator of allergic predisposition, eosinophil count (EOS) as a marker of eosinophilic inflammation, and tryptase (if mast cell disorders are suspected). The evidence is based on clinical guidelines (e.g., EAACI) and is rated as human-strong. Caveat: Individual factors (e.g., renal function, duration of use) may influence the optimal washout; consult your allergist if uncertain. The provided context contained no specific information on cetirizine or allergy testing, so this answer relies on general medical knowledge.