With millions of Americans prone to allergic reactions, medical hospitals have set up special department and centers that can provide individualized help to patients who have problems with their allergy and are looking for ways to attain just a semblance of relief.
In fact, some communities, especially those near big universities are setting up units for allergy. This is done to help freshmen students who may not have the necessary information on their allergies when they came into town to stay for the rest of the semester.

Allergy Testing Centers
One of those services that allergy relief centers provides are diagnostic tests.
Knowing what is causing the allergic reactions can be really difficult especially if you are allergic to things that are not really seen by the naked eye or those that are so miniscule like molds and dust mites.
Allergy testing is conducted to pinpoint what exactly you are allergic from. Sometimes, allergy tests even determine the other things that you can be allergic except that you have not yet come into contact with them.
Oftentimes, the allergist in the allergy relief center will ask about your family history of allergy as well as your medical history before he or she will perform the diagnostic test.
Here are some of the diagnostic tests that allergy relief centers provide:

Skin prick or scratch test
This is the most common and the most reliable test for most allergies. The procedure will involve pricking the skin and inserting substances that contain the allergens in small amounts. All possible allergens are pricked into your skin so expect about 15 to 20 prick marks. After about 15 minutes, the skin will react to the tiny amount of allergen. If you are allergic to one substance, the skin will turn red and swollen.
It is important that you also reveal the medicines that you are using. Drugs that contain antihistamines and anti-depressants can affect the validity and reliability of this allergy test provided by the allergy relief center.

Intradermal test
The intradermal test is done s a supporting test or as a separate test when the results from the prick test is unclear. The procedure that it uses is similar to the prick or scratch test except that it involves the injection of a small amount of a specific allergen. This however can be dangerous and can result to anaphylaxis.

Blood test
Conducting the RAST (radioallergosorbent) test, a blood test that measures the levels of allergy antibody, IgE, produced when your blood is mixed with different kinds of allergens in a laboratory. If you are allergic to a certain substance, the allergy antibody will increase in the sample.
The blood test, however, cannot be done if you have skin problems such eczema. Medications that are long-acting or that you cannot stop taking can also affect the result as well as the presence of some conditions, which may alter the IgE level like HIV, skin diseases, and parasitic diseases.
Other drawbacks to the use of the test are the cost, which can be pretty expensive and because it involves extensive laboratory analysis, knowing the results may take a while.

Challenge test
After conducting a skin or blood test, the allergy relief center’s allergist can also recommend the use of a challenge test that will help clinch the exact problem. The challenge test however can be really dangerous as patients are asked to swallow a small amount of the suspected allergen. This is often done if the allergen is a food.