RESPIRATORY
OLD TUBERCULOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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in the hand
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in the gluteal area
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on the thigh
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on the forearm
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Detailed explanation-1: -The TST is an intradermal injection of 0.1 ml of tuberculin (PPD) on the inner surface of the forearm. The skin test reaction should be read between 48 and 72 hours after administration.
Detailed explanation-2: -The injection should be placed on the palm-side-up surface of the forearm, about 2 to 4 inches below the elbow. Your local institutional policy may specify the right or the left forearm for the skin test.
Detailed explanation-3: -The test is done by putting a small amount of TB protein (antigens) under the top layer of skin on your inner forearm. If you have ever been exposed to the TB bacteria (Mycobacterium tuberculosis), your skin will react to the antigens by developing a firm red bump at the site within 2 days.