Using the QC Programs
8-11
n
eanM
n
1i
i
x
∑
=
＝
()
1n
MeanX
SD
2
i
−
−
=
∑
100
Mean
SD
%CV ×=
Where, n is the number of the saved L-J analyses and X
i
is the result of the i
th
L-J analysis.
If the saved L-J analyses are less than 3, only the “mean” will be displayed. For a parameter,
if any of the saved results is non-numeric (*), the “mean”, “SD” and “CV%” are all empty.
The “■” and “□”points in the graphs can be interpreted as follows:
The “■” points fallen between the upper and lower dash lines are within the expected ranges;
The “■”points fallen outside the upper and lower dash lines are out of the expected ranges
The “□” points represents non-numeric parameter values (*), which can be caused by either
errors during the run or values outside the operating range.
If you see any points fallen outside the control range, do the following steps until the problem
is solved. If all the steps have failed, contanct Mindray customer service department or your
local distributor for assistance.
1. Check the upper left corner of the screen for error messages. Refer to Chapter 11
Troubleshooting Your Analyzer for solutions to any displayed error messages;
2. Check the L-J settings for inappropriate entries;
3. Do the background check. In case of an abnormal background result, refer to Chapter 11
Troubleshooting Your Analyzer for solutions;
4. Re-run the control;
5. Run another vial of control;
6. Check if the analyzer needs to be calibrated.
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