Mantoux Tuberculosis Skin Test Facilitator Guide
Appendix D: Mantoux Tuberculin Skin Test Interpretation Table
Skin test interpretation depends on
- the measurement in millimeters (mm) of the induration and
- the person’s risk of being infected with TB and/or progression to disease if infected.
The following three cut points should be used to determine whether the skin test reaction is positive. A measurement of 0 mm or anything below the defined cut point for each category is considered negative.
Induration of ≥ 5 mm is considered positive in
Induration of ≥ 10 mm is considered positive in
Induration of ≥ 15 mm is considered positive in
† For persons who are otherwise at low risk for TB and who are tested at the start of employment, a reaction of ≥15 mm is considered positive.