The tuberculin skin test is a screening test to identify people who have been exposed to tuberculosis. A small amount of protein is injected into a bubble under the skin, after wh
The tuberculin skin test is a screening test to identify people who have been exposed to tuberculosis. A small amount of protein is injected into a bubble under the skin, after which the arm is examined for evidence of an inflammatory reaction (as evidence by redness and raising of the skin). The lesion that develops is then measured by a healthcare provider who then judges the result as being positive or negative based on their results. The majority of individuals who have had latent infection, active disease, successfully treated tuberculosis, or have been vaccinated tuberculosis vaccination will test positive.
New nurses are trained on this technique using visual pictures of different actual test results to practice reading and appropriately judging tests as being positive or negative. If a student comes across the patient result shown to the right three different times in their training and identifies it as positive the first two times and negative the last time, that would be an example of…
Inter-Observer Variation
Intra-Subject Variation
Validity
Intra-Observer Variation
Percent Agreement
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