When should IgE be retested?

IgE retesting is not routinely needed but is indicated in specific clinical scenarios. After a confirmed IgE-mediated allergy (e.g., to foods, insect venom, or pollen), retesting after 1–2 years of strict avoidance or following allergen immunotherapy can help assess tolerance development. In children with food allergies (e.g., milk, egg), IgE levels often decline over time; retesting every 1–2 years guides the timing of oral food challenges. Retesting may also be warranted if new symptoms suggest additional sensitizations or if the initial test was inconclusive. Crucially, IgE tests are validated only for immediate-type (Type I) allergies. IgG food tests lack diagnostic value and are not recommended by medical societies. Based on the provided context, MyBody-X does not offer IgE food panels. Any retest should be discussed with an allergist, as false positives are common and clinical correlation is essential. Evidence is based on clinical practice and guidelines, not on randomized trials.