Patch testing is a type of allergy test performed to determine if someone may have a delayed type of reaction to a chemical or in some cases to a food.
It is most effective at determining if someone may be having a skin reaction caused by a chemical such as a perfume or dye. It usually involves applying a standard series of tests to the skin (using a patch). The patch is left on the skin for 48 hours and any reactions are measured when the patch is removed. It sometimes requires multiple visits to read and interpret the tests. At San Tan Allergy & Asthma we can do patch testing to several different types of materials, such as: chemicals, metals, sunscreens, dental materials, and foods. If there is a test you feel is appropriate that we may not do, you can always suggest it so it can be made available.