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Key points. The TB skin test (also known as the Mantoux tuberculin skin test or TST) is one method of determining whether a person is infected with TB bacteria. Reliable administration and reading of the TB skin test requires standardization of procedures, training, supervision, and practice.
A doctor may interpret a 5 mm induration as a positive result if you are taking immunosuppressant medications or previously had TB. An induration of at least 10 mm may be considered a positive...
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.
Use this ruler to measure the induration of a person’s reaction to the tuberculin skin test.
A purified protein derivative (PPD) skin test is a test that determines if you have tuberculosis (TB). TB is a serious infection, usually of the lungs, caused by the bacteria...
Two screening tests are available to detect TB infection in the United States: Tuberculin skin (TST) or purified-protein derivative (PPD) skin test via the Mantoux technique: [5] [6] Interferon-gamma release assay blood test (IGRA) [7]
Use your fingertips to find the induration. This is a hard, dense, raised formation with definite borders. If there is a firm bump, use a pen to mark the widest edges of the induration on the forearm. The only part that is important for your test results is the hard bump.
This annex gives information on administering, reading and interpreting a tuberculin skin test (TST). A TST is the intradermal injection of a combination of mycobacterial antigens that elicit an immune response (delayed-type hypersensitivity), represented by induration, which can be measured in millimetres. The standard method of identifying ...
An induration of 15 or more millimeters is considered positive in any person, including persons with no known risk factors for TB. However, targeted skin testing programs should only be conducted among high-risk groups. What Are False-Positive Reactions?
Accurate interpretation of tuberculosis (TB) screening (interferon-gamma release or skin test) requires knowledge of the patient’s medical history and risk factors. Depending on this information, different induration measurements may indicate a positive result.