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Testing for TB Infection
Learning ObjectivesHow to test for TB infection
Different tests for TB Infection
For TB infection, there are two recommended tests which can be used to identify such patients.
Tuberculin Skin Test (TST)
The skin test is done by injecting a small amount of TB antigens into the top layer of skin on your inner forearm. If one has ever been exposed to TB bacteria (Mycobacterium tuberculosis), there will be a reaction indicated by the development of a firm red bump (induration) >= 10 mm at the site within 2 days.
Figure: Tuberculin Skin Test
Interferon-gamma release assay (IGRA)
IGRA is a Blood test. If one has been exposed to TB bacteria, the white blood cell in the blood will release a substance called gamma interferon when the cells are exposed to specific TB antigens.
Figure: Interferon-gamma release assay (IGRA)
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