When Is Tuberculosis Screening Recommended for Latent Tuberculosis Infection?

Latent tuberculosis infection means tuberculosis bacteria are present but inactive. A person with latent infection does not have the symptoms of active tuberculosis and does not spread it to others through ordinary contact. Screening is considered after close contact with someone who has infectious tuberculosis, or when a clinician identifies increased exposure risk.

A screening test may be a blood test or a skin test. If the result suggests infection, the clinician may ask about symptoms and arrange a chest examination or other assessment to distinguish latent infection from active disease.

Tell the clinician about a known tuberculosis contact, previous test results, prior tuberculosis treatment, travel or residence in places where tuberculosis is common, immune-suppressing medicines, and any planned treatment that may lower immune activity. Keep appointments for follow-up even when you feel well.

If latent infection is confirmed, discuss the benefits and possible adverse effects of preventive treatment, how long monitoring may continue, and which symptoms should be reported. Do not start or stop treatment without medical guidance.

Seek medical assessment for a cough that does not settle, coughing blood, chest pain, fever, night sweats, unexplained weight loss, or unusual tiredness. These symptoms can have many causes, but they need evaluation for active tuberculosis, particularly after a known exposure.

Ask which screening test is suitable, when testing should occur after an exposure, whether another test is needed, and how follow-up will rule out active tuberculosis before preventive treatment.