Which statement regarding the Tuberculin skin test (TST) is FALSE?

The tuberculin skin test (TST) is a diagnostic tool used to identify individuals who may have been exposed to tuberculosis (TB). A key aspect of interpreting the TST results involves understanding the significance of induration measurements in different populations.

When analyzing the statements, it's important to note that an induration of at least 10 mm is widely recognized as a positive result for the general population in many contexts, indicating potential TB infection. Trained health workers administer the test to ensure accurate placement and interpretation of results, which is critical for proper diagnosis and follow-up.

In specific vulnerable populations, such as immunocompromised individuals, a smaller induration of 5 mm can indeed be interpreted as a positive result, reflecting their heightened susceptibility to TB. This tailored interpretation is designed to ensure that those at increased risk are identified and assessed appropriately.

Thus, affirming that all statements are true is the correct answer because each statement accurately reflects established criteria and protocols around the TST. Each individual component offers crucial insights into the clinical application of the test and the targeted responses needed for diverse populations, underlining the importance of understanding these subtleties in tuberculosis management.