A 39-year-old member asked:
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Tb skin test- how long after can you see redness or swelling?

1 doctor answer
Dr. Jay Park
Dr. Jay Park answered
49 years experience in Pediatrics
48 hours: Standard TB skin test typically measures size of induration 48 hours after an intradermal inoculation of ppd.
Answered on Dec 12, 2019

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Related questions:

A 35-year-old female asked:
Dr. Jay Park
Dr. Jay Park answered
49 years experience in Pediatrics
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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A 34-year-old female asked:
Dr. Jeffrey Levine
30 years experience in 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 ... Read More
A 42-year-old member asked:
Dr. Elena Vezza
Specializes in Internal Medicine
Varies: The positive reaction can persist up to 10 -14 days.
A 31-year-old male asked:
Dr. Neelam Uppal
36 years experience in Infectious Disease
About a week: about a week

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