When must a TB test be performed on all new clients?

The requirement for performing a TB test on all new clients is typically grounded in ensuring the safety and health of both clients and staff within care settings. The correct choice underlines that a TB test should be carried out within a specific time frame that guarantees accurate results and immediate comprehension of a client's health status.

Conducting the test within one year prior to admission allows for a recent assessment of the client’s TB status. This interval ensures that the test reflects the current health condition of the client, helping to identify any potential infections before they enter a shared environment. Regularly updating this health check supports the containment of tuberculosis, particularly in congregate settings where the risk of transmission can be higher.

The other options present time frames or conditions that do not systematically ensure adequate health screenings prior to admission, which could lead to a higher risk of undiagnosed infections being present among new clients.