Cleveland Clinic Journal of Medicine (CCJM)How Should I Evaluate Allergic Disease in Patients with Asthma?

🎓 Expert Commentary / Peer Perspective

Allergic mechanisms can contribute to asthma symptoms and exacerbations, but sensitization alone does not establish clinically relevant allergic disease. Guideline-based evaluation emphasizes history-directed testing when results could alter environmental interventions, immunotherapy eligibility, or advanced therapy selection. Total serum IgE should not be used as a stand-alone screen for allergic asthma.

Clinical Considerations

• Test selectively when allergic triggers are clinically suspected, particularly with seasonal exacerbations, exposure-linked symptoms, allergic rhinitis, or persistent childhood-onset disease with allergic features.
• Skin-prick testing and serum allergen-specific IgE are both acceptable for evaluating sensitization; selection depends on clinical circumstances and feasibility.
• Positive allergy tests demonstrate sensitization, not necessarily clinically relevant disease; exposure history, symptom timing, and seasonality remain essential to interpretation.
• Total serum IgE neither confirms nor excludes allergic asthma. Its principal role described in the review is assessing eligibility and dosing for anti-IgE biologic therapy.
• Before advanced therapy is considered for difficult-to-control asthma, clinicians should reassess the diagnosis, adherence, inhaler technique, comorbidities, and controller therapy.
• Biologics and allergen immunotherapy address different clinical problems: biologics target inflammatory pathways in selected uncontrolled moderate-to-severe asthma, while immunotherapy addresses clinically relevant allergic sensitization and requires stable asthma.

Practice Applications

• Use the clinical history to select relevant inhalant allergens, rather than ordering broad screening panels.
• Interpret allergen-specific IgE or skin-test positivity alongside exposure and symptom patterns before attributing asthma morbidity to that allergen.
• Do not use total IgE alone to diagnose or exclude allergic asthma.
• Reassess modifiable causes of poor asthma control before escalating to advanced therapy.
• Avoid initiating allergen immunotherapy in uncontrolled asthma; the review identifies uncontrolled disease as the strongest predictor of systemic reactions during immunotherapy.