CUBE 30 TOUCH | USER MANUAL
Jennings graph shows: on the x axis the number of repetitions of the controls, on the y
axis the mean value (AVG, green line) and the distance from the mean measured in
standard deviations (± SD yellow lines, ± 2SD red lines). The type of control is indicated at
the top right (N for Normal control and A for pathological, abnormal control).
WESTGARD rules are widely established statistical rules which make it possible to
identify, on a probability basis, systematic and random errors that can lead to a failure to
comply with established objectives of accuracy and precision.
The following Westgard rules are commonly used:
• 1
2s:
A control value exceeds the mean of two standard deviations.
• 1
3S:
A control value exceeds the mean of three standard deviations.
• 2
2S:
Two consecutive values exceed the mean of two standard deviations on the same
side of the mean.
• R
4S:
The difference between two consecutive values exceeds the four standard
deviations.
• 4
1S:
Four consecutive values exceed the mean of a standard deviation on the same
side.
• 10
x:
Ten consecutive values fall on the same side compared to the mean.
In the event that a rule is not respected, the instrument signals the condition to the user
through the danger symbol, which can be viewed in Figure 65, on the right.
By pressing the export button , it is possible to:
• print QC data: QC details, mean, standard deviation, CV%, date, time and result of
each analysis (Figure 66)
• Filter by lot
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