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Yessi Pratiwi — September 16, 2007 / 10:50 pm
Allergies are the result of a hypersensitive immune system. The allergic immune system misidentifies an otherwise innocuous substance as harmful, and then attacks the substance with a ferocity far greater than required.
There are some diagnostic techniques to determine if a person is allergic. The most common test, the scratch test, consists of applying a diluted extract of the possible allergen to the back or arm, and then scratching the skin with a needle. If the patient develops a certain degree of swelling or redness in the scratched area, the existence of IgE antibodies to that allergen is indicated.
Another way is blood test. Blood tests are another avenue of diagnostics, usually this kind of diagnostics is applicable to especially small children, where the scratch test is used less often because the possible allergens used in the test may actually trigger a reaction in a child who has not been exposed to that substance before.
Neither the scratch test nor the blood test is 100 percent accurate, but the results, taken together with a patient’s medical history, can help the doctor or allergist with a diagnosis and treatment plan.
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