What is a two-step TB test

[carol72]

I am an LVN with a quick question. Has anyone heard of a two-step TB test? What is this? Thank-you.

[EricJRN, MSN, RN]

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

http://www.google.com/search?sourceid=navclient&ie=UTF-8&rls=SNYF,SNYF:2004-45,SNYF:en&q=two+step+PPD

[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