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You and your health care provider must decide which treatment option is best for you.
This is often done with infants, children, and people infected with HIV who have recently spent time with someone with TB disease.
You may need a second skin test 8 to 10 weeks after the last time you spent time with the person with TB disease.
This is because it can take several weeks after infection for your immune system to react to the TB skin test.
The tests measure the response of TB proteins when they are mixed with a small amount of blood.
If your health department does offer the TB blood tests, only one visit is required to draw blood for the test.