Pre- and post-test probability: Difference between revisions

Revision as of 15:05, 28 June 2016

Revision as of 03:10, 22 July 2016

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=====Methods to overcome inaccuracy=====

To avoid such sources of inaccuracy by using likelihood ratios, the optimal method would be to gather a large reference group of equivalent individuals, in order to establish separate ''predictive values'' for use of the test in such individuals. However, with more knowledge of an individual's medical history, physical examination and previous test etc. that individual becomes more uniquedifferentiated, with increasing difficulty to find a reference group to establish tailored predictive values, making an estimation of post-test probability by predictive values invalid.

Another method to overcome such inaccuracies is by evaluating the test result in the context of diagnostic criteria, as described in the next section.