What is the purpose of conducting a patch test before a treatment?

Conducting a patch test before a treatment serves a critical purpose in ensuring client safety. The main objective is to check for allergic reactions to products that will be used during the treatment. This involves applying a small amount of the product to a discreet area of the skin and observing it for a specified duration. If any irritation, redness, or allergic response occurs, it indicates that the client may have an adverse reaction to the product. This proactive measure helps to avoid potential complications during the actual treatment, contributing to a safer and more positive experience.

The other options do not align with the primary purpose of a patch test. Determining treatment time, exploring product variety, or assessing pain tolerance are not directly related to the skin's reaction to specific products. While these aspects are relevant in the context of overall treatment planning, they do not address the critical safety element that the patch test aims to fulfill.