Size Of Positive Ppd Test. Positive tb skin test result: The absence of tb symptoms means your infection is not contagious and you cannot pass it on to others.
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• measurement in millimeters (mm) of the induration • person’s risk of being infected with tb and progression to disease if infected An induration of 15 mm or more is considered positive in: ≥10 mm is positive in patients with negative baseline or previous screening result of 0 mm