PPD Skin Test - StatPearls - NCBI Bookshelf
Jan 24, 2022 · PPD Skin test Interpretation Based on CDC Guidelines. 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. As the diameter cutoff increases, the sensitivity of this test declines, and the specificity increases.
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