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If the TB skin test is used for baseline testing of U.S. health care personnel, use two-step testing. Two-step testing. 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.
TB skin test. The TB skin test is also known as the tuberculin skin test. If you receive a TB skin test, you will have two visits with your health care provider. First visit. During the first visit, a health care provider uses a small needle to put some testing material under the skin on the lower part of your inner arm.
Understanding TB blood test or TB skin test results. A positive test result for TB infection means you have TB germs in your body. Your health care provider will do other tests to determine if you have inactive TB or active TB disease. These tests may include a chest x-ray, and a test of the sputum (phlegm) you cough up.
determine if you have active TB disease. • Once you test positive for TB, you will always have a positive skin test even if you complete treatment for TB. Ask your health care provider for a written record of your positive TB skin test result. This will be helpful if you are asked to have another test in the future. If your TB skin test is ...
A positive result from a TB blood test or TB skin test usually means TB infection. More tests, such as a chest radiograph, are needed to rule out TB disease. Some people with TB disease may have a negative result from a TB blood test or TB skin test. Results from these tests cannot be used as the only information for excluding or confirming TB ...
a person has been infected with TB bacteria: the TB blood test and the TB skin test. TB blood tests (sometimes called IGRAs) use a blood sample to find TB infection. The tests measure the response of TB proteins when they are mixed with a small amount of blood. Only one visit is required to draw blood for this test.
Interpretation of TB blood test results. A positive test result usually means TB infection. More tests, such as a chest radiograph, are needed to rule out TB disease. A negative test result means TB infection is unlikely, but cannot be excluded, especially if the patient:
Skin test interpretation depends on two factors: • Measurement in millimeters (mm) of the induration • Person’s risk of being infected with TB and progression to disease if infected The three cut points below should be used to determine whether the skin test reaction is positive. A person with a positive reaction should be referred for a
TB skin test. For the TB skin test, a health care provider uses a small needle to put some testing material under the skin. You will need to return to your health care provider in two to three days to see if there is a reaction. Understanding TB blood test or TB skin test results. A positive test result for TB infection means you
Identify best practices to prevent false-positive results for MTBC. Recognize possible scenarios for identifying potential false-positive results. Describe the actions necessary to investigate potential false-positive results. Summarize how the TB laboratory and the TB Control Program should collaborate to investigate false-positive results.