An allergy skin test is a common diagnostic tool used to identify substances (allergens) that trigger allergic reactions. The test involves introducing a small amount of the suspected allergen to your skin. This can be done through various methods, such as:
- Prick Test (Scratch Test): A tiny drop of allergen is placed on the skin, and the skin is pricked with a needle or lancet.
- Intradermal Test: A small amount of allergen is injected just under the skin.
- Patch Test: A patch containing the allergen is applied to the skin, usually on the back, for a period of time.
After the allergen is introduced, the skin is monitored for a reaction. The most common signs of a positive reaction include:
- Wheals: Red, raised, itchy bumps that appear within 15-20 minutes of the test.
- Flare: Redness and swelling that develops around the wheal.
Here's how to check an allergy skin test:
- Clean the test site with alcohol.
- Place drops of allergens on the skin about 2.5 cm (1 in.) to 5 cm (2 in.) apart.
- Prick the skin under each drop with a needle.
- Check the skin after 12 to 15 minutes for red, raised itchy areas called wheals.
Note:
- The allergist will interpret the results of the test and discuss them with you.
- If you have any questions or concerns about the test, be sure to ask your doctor.
