Pet Dander Allergy: Testing Methods & What to Expect

Pet dander allergy is diagnosed through clinical history plus confirmatory testing:

Standard Tests

1. Skin prick test (SPT) – drop of dander extract on forearm/back, pricked. Wheal ≥3 mm larger than negative control at 15–20 min = positive. High sensitivity, specificity.
2. Serum specific IgE (ImmunoCAP, etc.) – blood test measuring IgE to dog/cat allergens (Can f 1, Fel d 1). Useful if SPT contraindicated (dermatographism, antihistamines).
3. Component-resolved diagnostics – identifies specific allergen molecules (e.g., Fel d 1 vs. Fel d 4) to predict severity/cross-reactivity.

Challenge Test (Rarely Needed)

Controlled exposure in a clinical setting. Reserved for discordant history/testing or occupational assessment. Risk of severe reaction.

Self-Observation

Symptoms (sneezing, itchy eyes, congestion, wheezing, hives) on exposure support suspicion but do not confirm allergy. Formal testing is needed for definitive diagnosis and immunotherapy planning.