Allergy tests are divided into two main types, the first leather tests and the second blood tests.
Skin allergy tests are characterized by giving faster results and more expensive compared to blood tests.
It should be noted that there are many factors that may affect the results of these tests, such as: the efficiency of the laboratory, the drugs that a person takes, such as: antihistamines, three -loop antidepressants, and some medications used to treat stomach burn.
In addition to the omalizumab, which is used in the treatment of asthma, which may continue to affect the test results for more than six months after stopping taking it, unlike other drugs that affect less periods.
Types of skin allergy tests
Scratch tests
During which a liquid contains an allergy causes on the skin using a special tool, then monitoring symptoms such as redness and swelling.
Inside dermis tests: The subcutaneous allergens are injected in the event that the results of the scratch test are not clear.
Patch test: a leather patch containing allergens is used, and the body’s reaction is verified after two days and four days.
Photo test: It is used for people with leather inflammation resulting from exposure to sunlight.
Interpretation of the results of the skin tests
Positive test results indicate an allergy to a specific substance, while negative results mean that there is no usurper. However, skin allergy tests may give wrong results, whether positive or negative, and the interaction with the test may differ at different times, and the size of the rash can indicate the severity of allergies.
Blood sensitivity test
The blood allergy test measures the level of antibodies known as immunosuralin (IIE) in the blood, which is produced by the immune system in response to harmless substances such as pollen, which leads to the appearance of allergies.
Types of blood allergy test
The overall immunoglobulin analysis: it measures the total amount of immunoglobulin E in the blood.
Immunosuvial analysis is determined: measures the level of antibodies against a specific type of allergens.
Interpretation of the results of the blood test
The high level of immunoglobulin E. The specific immunodeficiency indicates the possibility of an allergy, but this does not necessarily mean that the increase in the level of antibodies indicates the severity of the sensitivity may give positive or negative results, so it is necessary to conduct tests
