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14 maj 2024 · If the first TB skin test result is negative, a second TB skin test should be done 1 to 3 weeks later. If the second TB skin test result is positive, it is probably a boosted reaction. Based on this second test result, the person should be classified as previously infected.
You may need a second skin test 8 to 10 weeks after the last time you spent time with someone with active TB disease. This is because it can take several weeks after infection for your immune system to react to the TB skin test. If your reaction to the second test is negative, you likely do not have inactive TB or active TB disease.
When given a TST years after infection, these persons may have an initial negative reaction. However, the TST may stimulate the immune system, causing a positive or boosted reaction to subsequent tests. Giving a second TST after an initial negative TST reaction is called two-step testing.
Multiple puncture tests should not be used as these tests are unreliable (because the amount of tuberculin injected intradermally cannot be precisely controlled). This annex describes how to administer, read and interpret a TST using 5 tuberculin units (TU) of tuberculin PPD-S.
The result is determined by the diameter of the reaction and individual characteristics of the person being tested. It should be recorded in millimetres, not as "positive" or "negative". The reaction is the area of induration (swelling that can be felt) around the injection site.
16 gru 2023 · Table of Contents. View All. Purpose of Test. Risks. Before the Test. During the Test. After the Test. A TB skin test shows if your immune system has responded to the bacterium that causes tuberculosis (TB). It is also called a PPD test, tuberculin test, or Mantoux test.
If the TST is negative, advise the patient about repeat testing, if applicable. If the TST is positive: • Advise the patient that they should never have another TST. • Provide teaching about LTBI. • Reassure patient that they are not infectious and cannot transmit tuberculosis to others.
