Is IgE Allergietest useful for Müdigkeit?

An IgE allergy test is designed to detect type I allergies (e.g., hay fever, food allergies). Fatigue can occasionally accompany untreated allergies, but it is a non-specific symptom with many more common causes (iron deficiency, thyroid dysfunction, poor sleep, stress, cortisol imbalance). The provided context offers no evidence supporting IgE testing for fatigue. Without concurrent allergic symptoms (sneezing, itching, hives), the test is not useful for fatigue evaluation. Evidence: insufficient for this indication.