Patch testing is a process used to detect whether someone has allergic contact dermatitis to something they contact at work or home. During patch testing, small amounts of chemicals or things that are used at work or home are diluted and placed onto discs mounted on hypoallergenic tape and then placed on the back.
How many patches?
The number of patches applied is specific to each individual. There are 10 discs on each patch and those attending our clinic often have approximately 7-10 patches or sometimes more placed on their back.