At different dates, an audit of instrument records and LIS records discovered different QC values for magnesium:
|LIS QC result
|1.78 - 2.02
|Analyzer audit report
|2.1 and 2.2
First off, you can see that the analyzer had some values that were out. Presumably, a control was out, it was repeated and it was still out. But the LIS value is in.
Read more and find out the solution for this mystery:
Can You Solve This QC Mystery?
Source: Westgard QC
Image credits: Westgard QC
Art and Science of Laboratory Medicine