PPD Skin Test - StatPearls - NCBI Bookshelf
Jan 24, 2022 · Reading of the PPD Skin Test. Type IV hypersensitivity reaction (delayed-type) to the injected tuberculin PPD antigen is seen and measured. ... The result of the PPD test is positive or negative. However, the size of the induration diameter cutoff (5 mm, 10 mm, and 15 mm) for the test to be positive is based on certain risk factors ...
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