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https://www.cdc.gov/tb/publications/factsheets/testing/skintesting.htm#:~:text=The%20skin%20test%20reaction%20should%20be%20read%20between,the%20induration%20%28palpable%2C%20raised%2C%20hardened%20area%20or%20swelling%29.
https://allnurses.com/tb-test-read-earlier-t590822/
TB test read earlier than the 48-72 hour window. Hello colleagues. 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.
https://www.cdc.gov/tb/publications/factsheets/testing/skintesting.htm
In general, there is no risk associated with repeated tuberculin skin test placements. If a person does not return within 48-72 hours for a tuberculin skin test reading, a second test can be placed as soon as possible. There is no contraindication to repeating the TST, unless a previous TST was associated with a severe reaction.
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.healthline.com/health/ppd-skin-test
After 48 to 72 hours, you must return to your doctor’s office. A nurse or other medical professional will check the area where you received the shot to see if you’ve had any reaction to the PPD.
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