This blood test screens for TB but does not diagnose active TB disease or latent TB infection. Your test results will come back either positive, negative or indeterminate:
- Positive TB blood test: This result suggests that M. tuberculosis infection is likely. You should contact your provider for next steps. Your healthcare provider may recommend additional tests and exams to confirm if you have an active TB disease or latent TB infection.4
- Negative TB blood test: This result suggests that M. tuberculosis infection is unlikely. Although rare, some people who are immunocompromised (meaning a weakened immune system), may have false-negative results. 5
- Indeterminate: This result indicates uncertain likelihood of tuberculosis infection and may warrant a repeat test.