Final answer:
The client wipes the cap with alcohol before filling the syringe to minimize contamination and reduce the risk of infection, adhering to safe injection practices.
Step-by-step explanation:
The client should wipe the cap with alcohol prior to filling the syringe to reduce the risk for infection. This is a standard practice in medical procedures that involve injections to ensure that pathogens are not introduced into the body via contaminated equipment. In this context, alcohol is used as a disinfectant to clean the surface of the cap, thereby minimizing the chances of infectious agents contaminating the medication or the injection site.