When caring for a client with an ankle sprain using an aquathermia pad, what should the nurse do before application?

Before applying an aquathermia pad, covering the pad with a pillowcase is important for several reasons. First, it creates a barrier between the pad and the client's skin, which helps to prevent burns or irritation that may occur if the pad is applied directly to bare skin. This is especially critical if the pad is heated, as direct contact may lead to overheating and skin damage.

Additionally, using a pillowcase allows for easier cleaning and reduces the risk of contaminating the pad with skin oils or other substances. It also enhances the comfort of the client, making the treatment more pleasant. While the other options may seem beneficial, they do not provide the same level of safety and comfort that covering the pad does.