How to Read a Tuberculosis Skin Test
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Please review and confirm that you wish to publish this article Introduction
how it's done, what it's for read in 48 to 72 hours by trained professional
don't measure redness, just induration millimeters Interpretation
no induration, 5 mm, 10 mm, 15 mm Key Concepts
- False positive reactions can occur if the test was not administered properly and in individuals who have been vaccinated with the tuberculosis vaccine. False negative results may also occur, especially in people with weakened immune systems or if the tuberculosis infection was recently acquired. Individuals who have had tuberculosis for a long period of time may also not react with a positive result, explains the CDC.