Allergy tests can be done to help identify if you are allergic and what you are allergic to.
Prick Skin Testing: With prick skin testing, a small amount of each thing you may be allergic to (allergen) is placed on the skin - often the back. The skin is then pricked. If you are allergic to an allergen, you will get a bump and redness where the skin is pricked.
Intradermal Skin Testing:
Intradermal skin testing is most often used when prick skin testing is negative and there is a strong suspicion of allergy from the history.
Blood/RAST Testing: A blood test may be done if you have skin problems or if there is concern that someone will have a severe reaction to a skin test (this is very rare). There are many types of blood tests that can be used to detect allergies, but the most common one is called RAST.
Patch Skin Testing: Patch skin testing may be used to find out if a rash is from direct contact with an allergen. Small amounts of allergens are placed on the skin, often the back. The skin is covered with a watertight bandage for several days. After several days the patch is removed and the skin reactions are measured to find out if you may have a contact allergy.
Food Challenge: If you have a positive skin test to foods, your doctor may consider a food challenge. In some cases, this test is the only way to make a diagnosis of food allergy. Increasing doses of the suspected food are given and you are checked for symptoms.
BACK: Your History