How Are Allergy Testings Done?

The consumption of certain products and substances trigger allergic reactions to the skin and blood of the person. In this situation, an allergy testing is necessary for person to avoid the products that may be causing allergic complications.

There are three types of allergy testing: skin test, blood test and elimination tests. Skin tests are conducted by scraping skin portions of the person, which will then be placed with a small amount of substance known to cause allergic reactions. Blood tests are not as frequently performed like skin tests, but they are only conducted when a person is unable to have his skin tested due to the presence of skin disease. The most typical method of blood testing is the radioallergosorbent testing (RAST), where the antibody known as immunoglobulin E (IgE) is measured in the blood and determines the chances that the person is prone to allergic reactions. Lastly, an elimination test is a diet controlling the food consumption, which in turn determines whether or not the person has food allergies. This method can be done without the assistance of your doctor, although it really would help if you are provided with the list of foods to avoid.

Test preparations may seem to hinder the testing process, but it does provide the doctors with records regarding your medical history, all of which may be crucial in the testing process. Certain prohibitions such as the consumption of illicit drugs and substance are definitely disallowed prior to the testing.

As far as the actual testing on both methods is concerned, the person will fell a temporary itchiness and discomfort when a portion of the skin is pricked using a tiny needle. On the other hand, drawing blood from the vein during blood testing may sound a little violent, but the person usually never feels anything during the process.

Although allergy testing is meant to help you with your condition, both skin and blood testing pose health risks of their own. For instance, skin testing could cause swelling of the face, severe itching, and a serious reaction known as anaphylaxis. Meanwhile, inflamed veins and profuse bleeding are two of the more common disorders that can happen during blood testing.

A negative skin test would produce stable red areas (wheals) caused by allergen, while a positive skin test would produce raised wheals that are 1/8 larger than the normal. Blood testing are simply determined by the IgE levels: at least 4 times the normal IgE level deems the person allergic to the particular allergen.