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Two-Step Tuberculin Skin Testing (TST)
Tuberculin skin test algorithm to determine the difference between boosted TST reactions and reactions due to recent infection with M. tuberculosis.
Two-Step Tuberculin Skin Testing (TST) (PDF)
Purpose: To determine the difference between boosted TST reactions and reactions due to recent infection with M. tuberculosis.
Use: Initial baseline skin testing of adults who will be retested periodically.
*using 5, 10, or 15 mm cutoffs, depending on person's risk factors for TB
Adapted from CDC
Last Updated: 10/26/2022