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The first test is read 48–72 hours after injection. If the first test is positive, consider the person infected. If the first test is negative, give a second test one to three weeks after the first injection. The second test is read 48–72 hours after injection. If the second test is positive, consider the person infected in the distant past ...
The Heaf test was used in the United Kingdom until 2005, and is graded on a four-point scale. The Mantoux test is now used. The equivalent Mantoux test positive levels done with 10 TU (0.1 ml 100 TU/ml, 1:1000) are 0–4 mm induration (Heaf 0 to 1) 5–14 mm induration (Heaf 2) Greater than 15 mm induration (Heaf 3 to 5)
TB positive, indicating a sensitivity of 97.2%. [3] However, more recent data from a study in children with active TB disease in the UK suggest that the sensitivity of the T-SPOT.TB may in fact be worse than that of the tuberculin skin test (sensitivity reported as 66% and 82%, respectively). [4]
Diagnosis of latent TB relies on the tuberculin skin test (TST) or blood tests. [10] Prevention of TB involves screening those at high risk, early detection and treatment of cases, and vaccination with the bacillus Calmette-Guérin (BCG) vaccine. [3] [4] [5] Those at high risk include household, workplace, and social contacts of people with ...
The test used in the United States at present is referred to as the Mantoux test. An alternative test called the Heaf test was used in the United Kingdom until 2005, although the UK now uses the Mantoux test in line with the rest of the world. Both of these tests use the tuberculin derivative PPD (purified protein derivative).
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The Heaf test, a diagnostic skin test, was long performed to determine whether or not children had been exposed to tuberculosis infection. The test was named after F. R. G. Heaf . Also known as the Sterneedle test , [ 1 ] it was administered by a Heaf gun (trademarked "Sterneedle"), [ 2 ] a spring-loaded instrument with six needles arranged in ...
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