When should a patch test be performed?

• A. During service
• B. Before any chemical service
• C. Only upon client request
• D. After service

Answer: (B)

A patch test is done to check for an allergic reaction to the chemical ingredients in the product before you expose the client to the chemical service. It should be performed before any chemical service so you have time to catch a potential reaction and adjust or cancel the service if needed. You apply a small amount of the product (often behind the ear or on the inner forearm) and wait 24 to 48 hours to watch for redness, itching, or irritation. If a reaction occurs, you don’t proceed with the chemical service. This timing protects the client and avoids exposing them to a product they may react to. It isn’t something you do during or after the service, and it isn’t optional or only on request.