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How long does it take to complete patch testing?

Dr. Michael Roizen, MD
Internal Medicine
Prepare yourself to become a graffiti canvas for a few days. After the test, you’ll go back to the doctor a couple of times where the reaction under each patch is evaluated and rated. (There is a controversy over how valid this type of testing is). The first appointment will probably be 48 hours after the application and your doctor will mark the area with a waterproof pen. Subsequent appointments at 2-to-3-day intervals will be necessary to see if there has been any change, so you’ll know if the reaction was immediate or delayed. The whole process can take up to a week depending on your reactions. But it’s worth it if you do find out what pesky allergen is causing your symptoms.

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