Diagnosing TB involves a series of tests, including:
Tuberculin skin test: A small amount of fluid is injected under the skin, and the area is checked for a reaction after a few days.
Blood tests: These tests can detect antibodies to the TB bacteria. e.g. TB Gold test, TB by PCR test
Chest X-ray: This can show signs of TB infection in the lungs.
Sputum test: A sample of phlegm is analysed for the presence of TB bacteria.