Methods of Allergy Testing your Doctor Might Recommend

If you think that you may have an allergy, but you are uncertain of the specific allergen causing this allergic reaction, your doctor may suggests a variety of allergy testing to diagnose your condition. The different types of allergy tests identify a variety of allergens.

Since many tests work better than others depending on your specific allergy, it is recommended that you make sure you are familiar with the various kinds of allergy tests prior to making an appointment with your doctor. The basic tests fall into three areas: 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

The last type of allergy testing is the blood test, commonly called the RAST test. This is performed in the laboratory and uses blood that has been drawn for the patient. The blood is examined for presence of immunoglobulin antibodies. These will indicate if the body is producing an allergic reaction. Elevated levels of IGE's can tell your doctor if you are allergic to certain types of allergens. This method is not always accurate or precise as are the other methods. Should your doctor decide to have allergy testing done, he will examine your family medical history and tell you when to stop your medications.