2.4.1 Prior positive TB infection tests

If a prior positive TB infection test or TB treatment is documented, then repeat TB infection testing will not be useful and should not be done. Depending on the circumstances, the individual may be referred for further medical evaluation. However, if a prior positive result is self-reported and not documented, it is recommended to repeat the test, because studies have documented highly inaccurate self-reporting of prior skin test results (22).

Book navigation