What to Expect from Tuberculosis Screening for Latent Tuberculosis Infection

Screening is considered after close contact, residence or work in an area where tuberculosis is common, certain health conditions, or before some medicines that affect immunity. A skin test places a small amount of test material just under the skin and requires a return visit for the reaction to be checked. A blood test needs one sample and is interpreted with your history. A positive screening result suggests tuberculosis infection but does not by itself prove active disease.

Tell the clinician about previous tuberculosis tests, vaccination, exposure, symptoms and medicines. If screening suggests infection, further assessment may include a medical examination and chest imaging; sputum testing may be considered when symptoms point to disease in the lungs. Latent infection usually has no symptoms and cannot spread to others, but treatment may reduce the chance of future active disease. Keep follow-up appointments so results are interpreted in context.

Contact a clinician promptly for a cough that persists, coughing blood, fever, night sweats, unexplained weight loss or marked tiredness, especially after a known exposure. Seek urgent help for severe breathing difficulty, chest pain or coughing a large amount of blood. Do not wait for routine screening results if you feel seriously unwell.

Ask which test is suitable, when a skin-test reading is due, and what a positive or negative result means for you. Ask whether you need chest imaging, whether preventive treatment is appropriate, and how medicines will be monitored.