Do you have an allergy, but are unsure of the specific allergen causing your allergic reaction? Your doctor may be able to recommend a variety of allergy testing to diagnose your condition.
A variety of allergens can be identified using these various tests. Since some tests will work better than others; it is a good idea to be familiar with the different methods of allergy testing available to you. Basically, the tests can fall into three categories: Scratch tests, elimination tests, and blood tests.
Scratch Tests
The scratch tests are the most common of the allergy tests that are done. This test consists of placing a small amount of the suspected allergen onto the surface of the patient’s skin, and then making a scratch or prick to allow the substance to penetrate the skin. The site is then observed closely for indication of an allergic reaction.
Swelling, redness, or itching are signs that an allergic reaction has occurred. A result can often be detected in as little as twenty minutes using this type of testing. The other advantage to this kind of test is that many different allergens can be tested together. This makes this method especially useful if the allergen is unknown, airborne, or a food allergy.
Elimination Diets
If a food allergy is suspected, the elimination diet may be performed. A variety of foods that are potential allergens are eliminated form the diet for several weeks. Each food is then gradually added back to the person’s diet, with attention being mad to see which of the selections of food is causing the allergy symptoms to return.
This method of allergy testing works best with mild allergic reactions. However, it can pose a potential danger to patients who have severe, anaphylactic allergies. If there is a severe allergy suspected, a third method of allergy testing is preferred to ensure the safety of the patient. Thus, a life-threatening substance is not placed into the system of the allergy sufferer.
Blood Tests
A RAST, or radioallergosorbent test, is the final type of allergy testing that is commonly performed. This is achieved by using blood drawn from the patient. It is then examined for the presence of immunoglobulin (Ige) antibodies. This indicates whether the immune system is producing an allergic reaction to the body. These Ige’s tell your doctor if you are allergic to certain allergens, although this testing does not tend to be as accurate and precise as other methods used.
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