How effective is tuberculosis screening for latent tuberculosis infection?

Screening uses an immune-based blood test or a skin test. A positive result suggests your immune system has encountered tuberculosis bacteria, but it does not by itself show whether infection is latent or active. The clinician considers symptoms, exposure history, immune status, and sometimes chest imaging to clarify the result.

Attend the appointment with details of previous tuberculosis exposure, vaccination, medicines, and any earlier test results. If screening is positive, complete the recommended assessment and discuss preventive treatment, including benefits, monitoring, and medicine interactions. If a recent exposure is suspected, ask whether repeat testing is needed after the relevant interval.

Seek prompt medical assessment for a persistent cough, coughing blood, fever, night sweats, unexplained weight loss, chest pain, or marked tiredness, especially after close exposure. Urgent help is needed for breathing difficulty, coughing significant blood, or severe deterioration.

Ask which test is suitable, how prior vaccination affects interpretation, whether you need chest imaging, and how preventive treatment would be monitored if latent infection is confirmed.