Today we will know about TB skin test. This test is a very good test for detection of TB infection. In that process a small amount of testing fluid (called tuberculin or PPD) is injected just under the skin on the underside of forearm. Actually tuberculin contains anti-antibody of TB bacteria. An infected person will have antibody against TB bacteria produced by immune system. So presence of antibody (against TB bacteria) confirms TB infection. After 2 – 3 days, there will be a swelling in the arm where tuberculin was injected. A positive reaction will result in more swelling due to the allergic reaction between the two antibodies. So by measuring the swelling a trained person can tell whether the person has TB infection or not.
If anyone has any question or insight regarding this feel free to ask and share.
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