A 35-year-old female asked:
Disclaimer

just got tb skin test and small 4 mm area is pinkish red like bleeding under the skin but no swelling or bump. is this positive? freaking out.

1 doctor answer
Dr. Jeffrey Levine
30 years experience Family Medicine
No: PPD/Mantoux/TB tests are interpreted by measuring the degree of induration (raising of skin), not discoloration. In addition the cutoff for size for positive test is: 15mm for low risk patient 10mm for high risk patient 5mm for HIV patient so in no case would 4mm qualify as a positive test; though again 4mm of pinkish red color without swelling is meaningless.
Answered on Jan 5, 2019

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A 54-year-old female asked:
Dr. Dean Giannone
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Wait...: a true reading cannot be obtained before 48 hours. We usually read the PPD test in 48-72 hours.
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Dr. Jay Park
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48 hours: Standard TB skin test typically measures size of induration 48 hours after an intradermal inoculation of ppd.
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Dr. Jay Park
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Swelling and redness: Only if you were exposed to someone with active tb. The diameter of induration is measured at 48-72 hours after the skin test. No need to put a band ... Read More
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