Common Symptoms Suggesting Aspirin Allergy
Aspirin allergy, often part of aspirin-exacerbated respiratory disease (AERD), triggers symptoms like nasal congestion, runny nose, wheezing, asthma attacks, hives, or swelling shortly after taking aspirin or other NSAIDs. Skin reactions or anaphylaxis occur within minutes to hours.[1]
When to Suspect and Seek Diagnosis
Suspect it if symptoms worsen with NSAIDs but not other pain relievers like acetaminophen. Primary care doctors or allergists diagnose based on history, especially in adults with asthma, nasal polyps, or chronic sinusitis—up to 30% of such patients have AERD.[2]
Skin Testing Limitations
Standard skin prick or intradermal tests with aspirin are unreliable because aspirin doesn't typically bind to IgE antibodies like pollen or foods do. Negative results don't rule it out; positive ones are rare and not diagnostic alone.[1][3]
Oral Aspirin Challenge: The Gold Standard
Diagnosis requires supervised oral challenge: incremental aspirin doses (starting at 5-10 mg, up to 300 mg) given in a clinic with monitoring for breathing, heart rate, and symptoms. Positive if reactions mimic natural exposure. It's done after ruling out active asthma or infection, often with premedication like antihistamines. Success rate exceeds 90% for confirming AERD.[2][4]
Alternative Tests
- Nasal challenge: Aspirin lysine inhaled or sprayed; measures nasal airflow drop. Safer for high-risk patients, sensitivity around 85%.
- Bronchial challenge: Inhaled aspirin for asthma-focused cases, but riskier.
- Blood tests (basophil activation): Emerging but not routine; detects cell responses to aspirin.
Avoid self-testing—fatal reactions possible.[3][5]
Who Performs Diagnosis and Preparation
Allergists or pulmonologists in equipped facilities. Prep includes stopping NSAIDs for 1-2 weeks, beta-blockers, and ensuring FEV1 >70% predicted. Costs vary; insurance often covers with referral.[4]
Risks and What If Positive
Challenges carry 5-10% severe reaction risk, managed on-site with epinephrine. Positive confirms avoidance of NSAIDs; alternatives include desensitization (daily aspirin buildup for tolerance).[2][5]
Sources
[1] AAAAI.org: Aspirin Sensitivity
[2] Mayo Clinic: Aspirin-Exacerbated Respiratory Disease
[3] UpToDate: Aspirin and NSAID Allergy
[4] ACAAI: Oral Aspirin Challenge
[5] NIH: AERD Diagnosis