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Agree - highly probably that the SD being used is not appropriate i.e. to large. 

Results should be distributed across the L-J chart, with approx. 1:20 results in the 2-3 SD space.

Suggest review local and published SD for analytes

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Are you saying that a specific parameter is consistently the same exact value each and every time QC is performed and for all three levels?  That would be amazing.  There are a couple non reportable items on our analyzer that stay pretty consistent but they are items that have to do with the operation of the instrument such as diff X and Diff Y.  none of our reportable parameters are steadily the same number each time...

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