TB Test: What Positive PPD and Negative PPD Results Mean
May 18, 2021 · Your previous health-related issues, plus your lifestyle can both affect your positive reading. For a healthy person who has a normal immune system, a pea sized hard swelling develops under the skin. If this “induration” is greater than or equal to 10 mm, the testing is positive. ... A 2-Step PPD test helps eliminate false-negative results ...
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