What conclusion should a nurse suggest after identifying 12 mm of induration at the site of a client's tuberculin purified protein derivative (PPD) test?

The conclusion that suggests further tests and a chest x-ray is grounded in the interpretation of the tuberculin purified protein derivative (PPD) test results. In the context of tuberculin testing, induration refers to the firmness or swelling around the site of the injection. An induration of 12 mm typically indicates a significant reaction that may suggest exposure to the tuberculosis bacterium.

When such a result is identified, it is standard practice to recommend additional evaluation. This often includes further diagnostic testing, such as a chest x-ray, to assess whether there is active tuberculosis disease present in the lungs or elsewhere in the body. The rationale is to ensure the client receives appropriate follow-up care and that any potential active infection is adequately addressed.

Additional tests are crucial because a positive PPD reaction alone does not confirm active disease; it merely indicates a prior exposure or infection. Therefore, further investigation is necessary to determine the best course of action for the client’s health.