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https://www.healthtap.com/questions/212367-why-is-my-tb-skin-test-site-still-irritated-after-72-hours/#:~:text=PPD%3A%20The%20result%20of%20PPD%20testing%20is%20read,free%21%20Doctors%20typically%20provide%20answers%20within%2024%20hours.
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 millimeters of the induration (firm swelling).
https://www.ncbi.nlm.nih.gov/books/NBK556037/
Reading of the PPD Skin Test. Type IV hypersensitivity reaction (delayed-type) to the injected tuberculin PPD antigen is seen and measured. The reaction starts at 5 to 6 hours, with a peak effect at 48 to 72 hours, after which it begins to subside. Therefore, the right time to read the test is after 48 to 72 hours of intradermal test placement.
https://pubmed.ncbi.nlm.nih.gov/3190377/
Most decisions, however, should still be based on results measured at 48 to 72 hours. Results with the pen technique must be interpreted with caution in the 5- to 14-mm range. The patients' readings of their own results are inaccurate and should never be relied on …
https://www.medicinenet.com/tuberculosis_skin_test_ppd_skin_test/article.htm
The standard recommended tuberculin test is the Mantoux test, which is administered by injecting a 0.1 mL of liquid containing 5 TU (tuberculin units) PPD (purified protein derivative) into the top layers of skin of the forearm. Doctors should read skin tests 48-72 hours after the injection. The basis of the reading of the skin test is the presence or absence and the amount …
https://www.healthtap.com/questions/212367-why-is-my-tb-skin-test-site-still-irritated-after-72-hours/
PPD: The result of PPD testing is read within 48 to 72 hours. If the test turned positive, the bump can persist for many days. If the test turned positive, the bump can persist for many days. 5.7k views Reviewed >2 years ago
https://www.cdc.gov/tb/publications/factsheets/testing/skintesting.pdf
How is the TST Read? 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).
https://www.aafp.org/afp/2003/0201/p613.html
The measurements at 72 hours were significantly higher than those made at 48 hours. In subjects who had any induration, the average reading was 1.7 mm larger at 72 hours than at 48 hours.
https://allnurses.com/tb-test-read-earlier-t590822/
So here is one for your, see if you can answer. I had a PPD planted at 6:30 pm Wednesday, came back on Friday to have it read. It was nice and negative. Time of the reading 6:17 pm, full 13 minutes earlier than the recommended 48-72 hour window. I asked the doctor if the test was going to be rejected because it was read 13 minutes early, but she said no, it …
https://adc.bmj.com/content/76/5/452
Therefore, any induration 24 hours after placement of the tuberculin PPD test has a sensitivity of 94% and a specificity of 75%. Of the 495 subjects with any induration at 24 hours, 311 had positive tests at 72 hours, giving a positive predictive value of 63%. This value reached 86% if the size of induration at 24 hours was ⩾5 mm.
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