Saturday, May 26, 2012

PPD Interpretation

Classification of the Tuberculin Skin Test Reaction

An induration of 5 or more millimeters is considered positive in
-HIV-infected persons
-A recent contact of a person with TB disease
-Persons with fibrotic changes on chest radiograph consistent with prior TB
-Patients with organ transplants
-Persons who are immunosuppressed for other reasons (e.g., taking the equivalent of >15 mg/day of prednisone for 1 month or longer, taking TNF-a antagonists)
An induration of 10 or more millimeters is considered positive in
-Recent immigrants (< 5 years) from high-prevalence countries
-Injection drug users
-Residents and employees of high-risk congregate settings
-Mycobacteriology laboratory personnel
-Persons with clinical conditions that place them at high risk
-Children < 4 years of age
- Infants, children, and adolescents exposed to adults in high-risk categories
An induration of 15 or more millimeters is considered positive in any person, including persons with no known risk factors for TB. However, targeted skin testing programs should only be conducted among high-risk groups.
CDC (Center for Disease Control and Prevention)

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