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https://www.cdc.gov/tb/topic/testing/tbtesttypes.htm
On the first visit the test is placed; on the second visit the health care provider reads the test. The TB skin test is performed by injecting a small amount of fluid (called tuberculin) into the skin on the lower part of the arm. A person given the tuberculin skin test must return within 48 to 72 hours to have a trained health care worker look for a reaction on the arm.
https://journal.chestnet.org/article/S0012-3692(16)51071-X/fulltext
CONCLUSION: Any induration at 24 hours may increase with time. At 24 hours, any induration has a low specificity, high sensitivity, and low PPV; induration ≥4mm(half the cut-off point) has high PPV; induration ≥8mm has high specificity, low sensitivity, and high PPV; <8mm has low NPV; any induration associated with CXR suggestive of tuberculosis has high PPV;the absence of any induration …
https://adc.bmj.com/content/76/5/452
The positive predictive value of reading the Mantoux tuberculin skin test in healthy adults at 24 compared with 48 to 72 hours was reported to be 75% by Howard and Solomon. However, in children we found that the positive predictive value of any induration (⩾1 mm) reading at 24 hours was relatively low (63%) when a cut off of ⩾10 mm was used to define a positive test.
https://www.cdc.gov/tb/publications/factsheets/testing/skintesting.pdf
However, TB blood tests are the preferred method of testing for people who have received the BCG TB vaccine. How Often Can TSTs Be Repeated? In general, there is no risk associated with repeated tuberculin skin test placements. If a person does not return within 48 …
https://www.ncbi.nlm.nih.gov/books/NBK369/
This influx begins within 24 hours and is usually complete by 72 hours. Although the pathogenesis of this reaction is not completely understood, it appears to require the release of lymphokines in the skin and the subsequent attraction of uncommitted mononuclear cells to the area.
https://www.medicalnewstoday.com/articles/317755
A TB skin test is the first method a doctor will use to try to determine if a person has TB. ... The second stage of diagnosis must take place between 48-72 hours after the tuberculin injection.
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