Suppose we have only one analyse in our lab and we want to its technical audit and to decide whether to continue with the same instrument or not.
RELIABILITY. This is the test for consistency. Consistency is obtained through repeated observation. If the result is consistent, the instrument is said to be reliability. This test is not conclusive to verify whether the instrument is "good" if it lacks "accuracy."
VALIDITY. This is the test for precision. For an instrument test, there must be a reference or threshold value against which the observed valued is compared. In general, this reference value should not be the expected valued obtained from the observation set (that would have been a trap in reliability test), i.e. the reference value should be one established by the industry or the general population independent of the current observation set.
In my opinion,Caliberation is the right method.
Regards
Dr. Kamath Madhusudhana
I not well understood this question. If you have only one analyser your choise should be its use or its not- use (i.e., ambletically, to work or not to work). However, to use this analyser correctly you should have a primary or secondary standard for calibration and a commutable material as a known value control
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