Evidence check: IgE in the context of Sport

The question about IgE in the context of sport is not directly addressed in the provided contexts. IgE (Immunoglobulin E) is a biomarker for allergic responses and is clinically used to diagnose allergies and asthma. In athletes, elevated IgE may indicate allergic burden that could impair performance (e.g., respiratory issues). However, there is no robust evidence that IgE alone predicts athletic performance or guides training adjustments. The evidence level is unclear: while IgE is relevant for allergic athletes, specific studies linking IgE to sport performance are lacking. Routine IgE screening in asymptomatic athletes is not recommended. Caution: IgE testing should only be interpreted in the context of clinical allergy suspicion, not as a general performance marker.