A 35-year-old female asked:
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 answered
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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