The importance of reliability, validity and accuracy in all medical and laboratory testing–there are no exceptions

screen-shot-2016-10-06-at-7-26-54-pmDiagnostic test accuracy is simply the ability of the test to discriminate among alternative states of health (Zweig and Campbell, 1993).

If a test’s results do not differ between alternative states of health, then the test has insignificant accuracy; if the results do not overlap with other states of health then the test has perfect accuracy.  Most tests accuracies fall between these two extremes.

The intrinsic accuracy of a test is measured by comparing the test results to the “true condition status.”

‘True condition status”  refers to one of  two mutually exclusive states.  Either a condition is present or it is absent.  

We determine true condition status by means of a “gold standard” which is a source of information completely different from the test under evaluation which tells us the true condition status of the patient.

Source: The importance of reliability, validity and accuracy in all medical and laboratory testing–there are no exceptions

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