TB Test: What Positive PPD and Negative PPD Results Mean
https://www.statcarewalkin.com/DocTalksBlog/tb-test-what-positive-negative-ppd-results-mean-walk-in-urgent-care-clinic-nyc/
May 18, 2021 · An important note on positive test results: your induration will likely not go away for 3-4 weeks. That is normal. If it becomes red and starts creating ulcers, talk to your doctors. What Is A 2-Step PPD Test? A 2-Step PPD test helps eliminate false-negative results. It is simply two tests done within two months of each other.
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