What is a two-step TB test

  1. I am an LVN with a quick question. Has anyone heard of a two-step TB test? What is this? Thank-you.
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    Joined: Aug '06; Posts: 233; Likes: 26


  3. by   EricJRN
    It involves having two PPD's within a short time period, such as one week. It increases the accuracy of the test.

  4. by   irish_std/n
    two-step tb testing involves a person getting re-tested one week after the initial tuberculosis test. if both tb tests are negative, the person is unlikely to have tb. about.com