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https://www.statcarewalkin.com/DocTalksBlog/why-should-i-get-a-2-step-ppd-test/#:~:text=You%E2%80%99ll%20have%20to%20wait%20at%20least%2048%20hours,hours%20from%20the%20time%20of%20your%20first%20injection.
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.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/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://www.statcarewalkin.com/DocTalksBlog/what-is-a-ppd-test/
It won’t diagnose the disease, but rather if you have exposure. The fastest way to get this testing done is in 48 hours. Then, doctors check your response to the test at 72 hours, after which you need to wait before the test can be re-done on a different part of the skin.
https://texreg.sos.state.tx.us/public/readtac$ext.TacPage?sl=R&app=9&p_dir=&p_rloc=&p_tloc=&p_ploc=&pg=1&p_tac=&ti=25&pt=1&ch=97&rl=173
(A) The Mantoux PPD test shall be read 48 to 72 hours after injection. However, if the person is not available for the scheduled reading, positive reactions may still be measurable up to one week after testing. The reading shall be based on measurement of induration (palpable swelling), not erythema (redness).
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.
http://www.tbcontrollers.org/docs/posters-2014-national-tb-conference/Collins_TST_June2014NTC.pdf
• Reading times 42-48 hours after PPD placement were considered “Early”. • Reading times 48-72 hours after PPD placement were considered “On-Time”. Figure 2. The mean diameter of induration was 10.9 mm among adults with an early TST reading compared to 10.8 mm in those read on time (p=0.78). Background Methods Results Discussion Figure 5.
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 …
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