How do you diagnose tuberculosis?

A positive TB skin test or TB blood test only tells that a person has been infected with TB bacteria. It does not tell whether the person has latent TB infection (LTBI) or has progressed to TB disease. Other tests, such as a chest x-ray and a sample of sputum, are needed to see whether the person has TB disease.Apr 14, 2016 read more

A hard, raised red bump means you're likely to have TB infection. The size of the bump determines whether the test results are significant. Results can be wrong. The TB skin test isn't perfect. Sometimes, it suggests that people have TB when they really don't. It can also indicate that people don't have TB when they really do. read more