What a positive Mantoux skin test means

The test measures a delayed skin reaction after a small amount of testing material is placed just under the skin. The result is assessed at a scheduled follow-up visit, and its meaning depends on the size of the reaction, your age, immune system, vaccination history, previous exposure, and reason for testing. Some people have latent TB infection without feeling ill; active disease can affect the lungs or other organs.

Arrange follow-up with a clinician rather than assuming the result is active disease or dismissing it. They may ask about contact with TB, travel, previous tests, symptoms, and medicines, then recommend a chest X-ray, an IGRA blood test, or further samples. Read about [Tuberculosis Screening] to understand the wider assessment. Do not start or borrow antibiotics without a prescription.

Seek prompt medical advice for a cough lasting weeks, fever, night sweats, unexplained weight loss, chest pain, or coughing blood. Seek emergency care for severe breathing difficulty, coughing a large amount of blood, confusion, or collapse. Follow local advice about reducing close contact if a clinician suspects infectious pulmonary TB.

Ask what your measured reaction means in your circumstances, whether you need a [Chest X-Ray] or IGRA test, and whether treatment for latent infection is advised. Clarify how to protect household contacts and which symptoms should trigger an urgent call.