Allergy skin tests are done to find out if a substance, called an allergen, may cause an allergic response. A small amount of a suspected allergen is placed on or below the skin to see if a reaction develops.
There are three types of skin tests:
Allergy skin tests are done to find out what things your child is allergic to.
Many medicines can affect the results of an allergy skin test, including tricyclic antidepressants and antihistamines such as cetirizine (Reactine), fexofenadine (Allegra), and loratadine (Claritin).
Be sure to tell your doctor about all the medicines your child takes. Your child may need to stop taking some medicines before getting an allergy skin test.
The doctor will:
Your child will wear the patches for 24 to 72 hours. Make sure that your child does not take a bath or shower or do any activities that could cause a lot of sweating while wearing the patches. This could loosen the patches and cause them to fall off.
After your child has worn the patches for 24 to 72 hours, the doctor will remove the patches and check your child's skin for signs of an allergic reaction.
The results of the skin prick or intradermal test will be available right after the test is done. The results from the skin patch test may be available right away, or when the doctor removes the patches. But a skin patch test reaction might not be seen for up to 2 days after a patch is removed.
If your child has an allergic reaction from any of the skin tests, he or she may have some itching, tenderness, and swelling where the allergen solutions were placed on the skin.
Allergy skin tests usually take less than an hour.
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Current as of: October 6, 2017
Adam Husney, MD - Family Medicine
& Martin J. Gabica, MD - Family Medicine & E. Gregory Thompson, MD - Internal Medicine & Lora J. Stewart, MD - Allergy and Immunology, Pediatrics
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