Diagnosis is best made through history and physical examination.
Your physician may also recommend you to undergo certain tests like:
- Complete Blood Count (CBC): This test will usually reveal an increase above normal of white cells called eosinophils . Sometimes, neutrophils also show an increase. This may denote an added infection.
- Skin Prick Test : During skin testing, small amounts of material that can trigger allergies are pricked into the skin of your arm or upper back and signs of an allergic reaction are observed. An allergic person will show a raised bump (hive) on skin wherever that particular allergen has been injected. This test will decide whether the person is allergic or not.
- Allergy Blood Test : A blood test, called the Radioallergosorbent Test (RAST), can measure the immune system's response to a specific allergen. The test measures the amount of allergy-causing antibodies in your bloodstream, known as Immunoglobulin E (IgE) antibodies .