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https://www.healthline.com/health/ppd-skin-test#:~:text=If%20the%20area%20of%20skin%20where%20you%20received,been%20infected%20with%20the%20bacteria%20that%20cause%20TB.
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://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.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.
https://jamanetwork.com/journals/intemed/articlepdf/610751/archinte_148_11_020.pdf
of induration) at 48 to 72 hours, 498 patients had no induration noted at 24 hours. Therefore, any induration 24 hours after placement of the tuberculin skin test has a sensitivity of 0.83 and a specificity of 0.88 (Table 2) regarding traditional readings. Any induration at 24 hours tended to give rise to a truly positive test at 48 to 72 hours ...
https://www.cdc.gov/tb/publications/posters/images/mantoux_wallchart.pdf
The skin test should be read between 48 and 72 hours after administration. A patient who does not return within 72 hours will probably need to be rescheduled for another skin test. Induration of 5 mm is considered positive in Human immunodeficiency virus (HIV)-infected persons Recent contacts of …
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3481914/
The Mantoux skin test should be read between 48 and 72 h after administration. Reading should be performed in a good light, with the forearm slightly flexed at the elbow. The basis of reading is the presence or absence of induration, which may be determined by inspection (from a side view against the light as well as by direct light) and by ...
https://www.cdc.gov/tb/education/mantoux/pdf/Mantoux_TB_Skin_Test.pdf
5 Record measurement of induration in mm If no induration, record as 0 mm Do not record as “positive” or “negative” Only record measurement in millimeters (mm) The skin test should be read between 48 and 72 hours after administration. A patient who does not return within 72 hours will probably need to be rescheduled for another skin test.
https://adc.bmj.com/content/76/5/452
The predictive value of induration 24 hours after administration of purified protein derivative (PPD) was examined. Altogether 1082 healthy schoolchildren were tested using 5 tuberculin units of PPD. Induration was measured at 24, 48, and 72 hours. At 24 hours, induration of any size had a relatively low positive predictive value (63%), although indurations >5 mm had a higher (86%) positive ...
https://pubmed.ncbi.nlm.nih.gov/3190377/
The degree of induration noted 24 hours after placement of 5 tuberculin units of purified protein derivative is valuable in a screening population. 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- …
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