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Measuring a reaction to the tuberculin skin test

Measuring a reaction to the tuberculin skin test
This figure shows the correct method for measuring a reaction to the tuberculin skin test. The size of the reaction is measured by the width of induration, not erythema. In the example shown, the reaction measures 10 mm.
Modified from: Testing for tuberculosis infection and disease. In: Core Curriculum on Tuberculosis: What the Clinician Should Know, 6th ed, Centers for Disease Control and Prevention 2013. https://www.cdc.gov/tb/hcp/education/core-curriculum-on-tuberculosis.html (Accessed on July 16, 2024).
Graphic 80766 Version 6.0