How many lash extensions should be added in quadrant 4 during a patch test?

During a patch test, it is important to evaluate how a client’s skin reacts to the adhesive and the eyelash extensions themselves. Adding 3 or 4 extensions in quadrant 4 of the patch test is considered an appropriate amount to adequately gauge any potential allergic reaction or sensitivity to the materials used.

By applying this number of extensions, the technician can ensure that there is enough of a sample for observation while minimizing the risk of overwhelming the client’s eyes with too many extensions at once, which could make it difficult to determine if any irritation is specifically related to the product. This method helps in making informed decisions about proceeding with a full application based on the client's tolerance and reaction to the materials used.

The other options do not provide a sufficient amount of extensions to effectively assess sensitivity while remaining cautious. Using only 1 or 2 extensions may not provide enough indication of a reaction, while 5 or 6 extensions might increase the risk of an adverse response. Not applying any extensions at all and only observing would not provide any actionable insights into how the client might react during a full application. Thus, adding 3 or 4 extensions strikes a balance between observation and safety during the patch test.