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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.cdc.gov/tb/topic/testing/tbtesttypes.htm
On the first visit the test is placed; on the second visit the health care provider reads the test. The TB skin test is performed by injecting a small amount of fluid (called tuberculin) into the skin on the lower part of the arm. A person given the tuberculin skin test must return within 48 to 72 hours to have a trained health care worker look for a reaction on the arm.
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://adc.bmj.com/content/76/5/452
The positive predictive value of reading the Mantoux tuberculin skin test in healthy adults at 24 compared with 48 to 72 hours was reported to be 75% by Howard and Solomon. However, in children we found that the positive predictive value of any induration (⩾1 mm) reading at 24 hours was relatively low (63%) when a cut off of ⩾10 mm was used to …
https://www.healthline.com/health/what-does-a-positive-tb-test-look-like
A positive skin test will usually be followed by a chest X-ray. This can help determine the difference between active TB disease and latent TB infection. Your doctor will look for white spots that ...
https://www.ncbi.nlm.nih.gov/books/NBK556037/
The peak of the induration reaction occurs after 24 hours of the test injection. Induration of the skin at the injection site occurs secondary to cell infiltration. It takes about 6 to 8 weeks after exposure to the bacteria for the PPD …
https://ariana.applebutterexpress.com/what-happens-if-your-tb-skin-test-is-positive
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. A negative result means that you most likely haven't been infected with the bacteria that cause TB .
https://www.cdc.gov/tb/topic/testing/diagnosingltbi.htm
Medical History. Clinicians should ask about the patient’s history of TB exposure, infection, …
https://www.dhhs.nh.gov/dphs/cdcs/tb/documents/positive.pdf
Tuberculin Skin Test or Blood Assay ---Results: Positive 1. What does a positive tuberculosis (TB) test mean? A positive reaction means that the person has TB germs somewhere in the body. The person may have latent TB infection, but not necessarily the disease. 2. How can a person be infected and not have TB disease?
https://www.cdc.gov/tb/programs/laws/menu/caseid.htm
The director of a clinical laboratory conducting an examination of a specimen submitted for analysis shall report to the Department, within 24 hours of obtaining results, all positive or reactive laboratory findings which indicate the presumptive or confirmed presence of M. tuberculosis complex, and also any laboratory findings which are otherwise required to be …
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