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https://www.cdc.gov/tb/publications/factsheets/testing/skintesting.pdf
The skin test reaction should be read between 48 and 72 hours after administration by a health care worker trained to read TST results. A patient who does not return within 72 hours will need to be rescheduled for another skin test. The reaction should be measured in millimeters of the induration (firm swelling). The reader should not measure
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.htm
The skin test reaction should be read between 48 and 72 hours after administration by a health care worker trained to read TST results. A patient who does not return within 72 hours will need to be rescheduled for another skin test. The reaction should be measured in …
https://pubmed.ncbi.nlm.nih.gov/3190377/
All subjects were tested using 5 tuberculin units of purified protein derivative via the Mantoux technique. Induration was quantitated by trained readers at 24 hours and at 48 to 72 hours. Patients were asked to read their own tests as well at 48 to 72 hours. The amount of induration at 24 hours was highly predictive of eventual findings at 48 to 72 hours.
https://www.healthtap.com/questions/783344-can-a-tb-skin-test-be-read-24-hours-later/
No: It is recommended to wait for at least 48 hours before interpreting the size of the swelling arising at the site of the TB test. This is because the swelling continues to increase for the first 48 hours & that is how this test has been standardized. Please make sure that you do not get your test done on a thursday, so the 48 hours time point won't come over a weekend.
https://www.researchgate.net/publication/14023651_Predictive_value_of_a_24_hour_tuberculin_skin_test_evaluation
The positive predictive value of reading the Mantoux tuberculin skin test in healthy adults at 24 h compared with 48-72 h was reported to be 75% by Howard and Solomon [16].
https://www.ncbi.nlm.nih.gov/books/NBK556037/
The peak of the induration reaction occurs after 24 hours of the test injection. Induration of the skin at the injection site occurs secondary to cell infiltration. It takes about 6 to 8 weeks after exposure to the bacteria for the PPD test to be positive.
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.
https://www.cvs.com/minuteclinic/services/tb-testing
The tuberculosis testing process has two segments: Part one. The tuberculin skin test (TST) is applied. Part two. The TST result assessment. Patients must return for a follow-up visit within 48 to 72 hours of the first visit to complete the TB test.
https://www.healthline.com/health/what-does-a-positive-tb-test-look-like
A TB skin test is also called a Mantoux tuberculin skin test (TST). The test is usually well-tolerated, and people rarely have negative reactions to it. A TB skin test is done in two parts:
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