Final answer:
In-use tests are used to determine whether disinfectant solutions are being used correctly in a clinical setting.
Step-by-step explanation:
Disinfectant solutions used in a clinical setting are tested to ensure they are being used correctly through in-use tests. These tests assess the effectiveness of the disinfectant on surfaces and determine if it is killing or reducing the growth of microorganisms properly. In-use tests are important to maintain the safety and cleanliness of clinical environments.