What is a two-step TB test

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

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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

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