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{{Short description|Probabilities of the presence of a condition}}
{{Use dmy dates|date=August 2013}}
'''Pre-test probability''' and '''post-test probability''' (alternatively spelled pretest and posttest probability) are the [[probabilities]] of the presence of a condition (such as a [[disease]]) before and after a [[diagnostic test]], respectively. ''Post-test probability'', in turn, can be ''positive'' or ''negative'', depending on whether the test falls out as a [[positive test|positive test or a negative test]], respectively. In some cases, it is used for the probability of developing the condition of interest in the future.
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