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A member asked:
Can you tell me if a tb skin test came up (borderline) positive, wouldn't it always come up the same?
A doctor has provided 1 answer
No: A person can have a false negative test if they are immuno compromised, have poor nutrition etc. 10 to 15% of people with newly diagnosed lung TB come up with a neg PPD initially. A test that is borderline may be positive later. Once you have a + ppd, you normally don't need to have it repeated.
Answered 7/10/2018
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