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https://www.netwellness.org/question.cfm/55517.htm#:~:text=There%20are%20four%20main%20reactions%20to%20PPD%3A%201%29,after%20PPD%20placement%2C%20and%20resolved%20by%2072%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/
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://www.healthline.com/health/ppd-skin-test
If the area of skin where you received the PPD injection isn’t swollen or is only slightly swollen 48 to 72 hours after the injection, the test results are negative.
https://www.medicinenet.com/tuberculosis_skin_test_ppd_skin_test/article.htm
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 of induration (localized swelling). A negative test does not always mean that a person is free of tuberculosis.
https://www.cdc.gov/tb/education/corecurr/pdf/chapter3.pdf
trained to read TST results. Reactions to PPD usually begin 5 to 6 hours after injection, reach a maximum at 48 to 72 hours, and subside over a period of a few days. However, positive reactions often persist for up to 1 week or longer. Health-care workers should
https://www.fda.gov/media/74866/download
Characteristically, delayed hypersensitivity reactions to tuberculin begin at 5 to 6 hours, are maximal at 48 to 72 hours and subside over a period of days. The resultant immune response
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