What should you know about dog allergy blood test?

The test uses a blood sample to look for allergen-specific antibodies. A positive result indicates sensitisation, which means the immune system recognises that allergen; it does not by itself prove that every symptom is caused by a dog. A negative result makes sensitisation less likely but does not explain every possible reaction. Allergic rhinitis, allergic conjunctivitis, asthma and pet allergy can overlap, while infections and irritants can cause similar symptoms.

Tell the clinician about symptoms, timing, contact with dogs, other animals, medicines and any previous severe reaction. Ask whether medicines need adjusting before the sample; do not stop prescribed treatment without advice. Keep a short exposure diary describing nasal symptoms, itchy eyes, cough, wheezing, skin changes or breathing problems. Results may lead to exposure advice, symptom treatment or further testing rather than a single decision.

Get emergency help for swelling of the lips or tongue, throat tightness, trouble breathing, widespread hives, dizziness or collapse after exposure. These may signal anaphylaxis. Arrange routine review for recurring symptoms, night-time breathing problems, persistent sinus symptoms or reactions that interfere with daily life, even if a blood test is negative.

Ask which allergens are included, what sensitisation means for your symptoms, whether skin testing is useful, how to reduce exposure and what to do during a severe reaction.