PPD Skin Test
Alternate Names : Purified Protein Derivative Standard, TB Skin Test, Tuberculin Skin Test
 See all Pictures & Images
What do Abnormal Results Mean?
Significance depends on the size of the reaction on the skin and the individual. The reaction is measured in millimeters of induration (hard swelling) at the injection site.
A small reaction (5 mm) is considered to be positive in individuals with HIV, in individuals on steroid therapy, or in individuals in close contact with a person with active tuberculosis.
Larger reactions (greater than or equal to 10 mm) are considered positive in individuals with diabetes, renal failure and health care workers, among others. In individuals with no known risks for tuberculosis, a positive reaction requires a 15 mm or greater induration.
|
