Evidence check: IgE Allergietest in the context of Müdigkeit

An IgE allergy test measures specific antibodies to allergens and can be useful when fatigue is linked to allergic reactions, such as seasonal allergies or food allergies that disrupt sleep or cause chronic inflammation. However, the evidence for a direct causal link between IgE-mediated allergies and fatigue as a primary symptom is weak. Fatigue is multifactorial, with common causes including iron deficiency, thyroid dysfunction, poor sleep, stress, and depression. A positive IgE result alone does not confirm that allergies are driving the fatigue. Direct-to-consumer tests often overstate the clinical significance of IgE findings, leading to unnecessary dietary restrictions or anxiety. Current guidelines recommend IgE testing only when a clear allergic history is present, not for general fatigue screening. Evidence: mechanistic/unclear. Sources: none in provided context.