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Here are the tests most commonly used by conventional allergists

From Allergy Free Naturally, Prevention Health Book Drops of suspected allergens are either placed onto or injected into your skin. If you're allergic to the substance, a round wheal or flare will form on your skin after 15 to 20 minutes. These tests measure either the total amount of immunoglobulin E, or IgE, in your bloodstream or the IgE that's specific to certain allergens, such as ragweed pollen. When IgE comes in contact with an allergen, it releases chemicals such as histamine, prostaglandins, and leukotrienes. These chemicals cause the symptoms of allergies. To measure your airflow, you blow into a device called a spirometer. Then a reading is taken. If asthma is suspected, you are given a bronchodilator and are then tested again. If your airflow improves, it's a good indication that asthma is present. A piece of blotting paper is soaked with the suspected allergen, then it is taped to your skin for 24 to 48 hours. If a rash develops on the site, it's a sign of eczema. Performed only if specific allergy testing is not available, these tests require you to inhale or swallow a very small amount of the suspected allergen so that your reaction to it can be observed. Because of the risk of serious reactions, these tests must be done only under a doctor's supervision.

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