What role does IgE Allergietest play in Allergie?

The IgE allergy test measures allergen-specific immunoglobulin E antibodies in the blood and serves as a screening tool for sensitization – not as a standalone diagnosis of allergy. Sensitization means the immune system has produced IgE against a substance (e.g., pollen, dust mites, foods), but up to 50% of individuals with positive food-specific IgE tolerate that food without symptoms. True allergy requires both sensitization and reproducible symptoms (hives, anaphylaxis, rhinitis, asthma) upon exposure. A positive IgE result alone does not confirm allergy, and a negative result does not rule out non-IgE-mediated reactions. The test must be interpreted by a board-certified allergist in the context of the patient’s history and, if needed, oral food challenges or provocation tests. Total IgE (reference range usually <100 kU/L in adults) can be elevated due to parasitic infections or hyper-IgE syndromes and is not diagnostic on its own. The test is useful for identifying potential triggers, but overinterpretation without clinical correlation leads to unnecessary diets or avoidance behaviors. The evidence is based on clinical practice and guidelines, not experimental data.