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Classification of Tuberculin Skin Test Reactions

Classification of Tuberculin Skin Test Reactions - Clinical Hub, References, Infection Control, Infection Control, Tuberculosis Control

Focus

A TST reaction of ≥5 mm of induration is considered positive in

A TST reaction of ≥10 mm of induration is considered positive in

A TST reaction of ≥15 mm of induration is considered positive in

Although skin testing activities should be conducted only among at-risk groups, certain individuals may be required to have testing for employment or school attendance independent of risk. CDC and ATS do not recommend an approach independent of risk assessment.


Centers for Disease Control and Prevention; National Center for HIV/AIDS, Viral Hepatitis, STD,and TB Prevention (2010). Latent Tuberculosis Infection: A Guide for Primary Health Care Providers. Retrieved from: http://www.cdc.gov/tb/publications/LTBI/pdf/TargetedLTBI.pdf