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3.7.2.10 Method Definition: Thresholds (Cut-off)
Use this option to define the threshold limits for a qualitative result. Up to three different classes
(ranges) are possible. The label for the classes can be user defined. For
n
thresholds you have n+ 1
quantitative label.
Cut-off limits can be defined for the measured absorbance values (OD.), kinetic values, transformed
values or concentration values, depending on the test protocol.
1.
To define the threshold(s) proceed as follows:
Select the data source first. The options are:
'Val' (absorbance or kinetic data),
'Trf' (transformed data)
'Conc' (concentration)
Next enter the label for the upper limit in the top left edit field. This can be a text like 'Positive'
or a symbol like '+'. Now enter the threshold condition for the upper limit. This can be a value
or an equation. After the condition for the upper limit has been entered, labels for other classes
and corresponding conditions can be entered.
2.
The threshold limits work as follows:
Label 1
If X > A
Label 1
Threshold A
Label 2
If X <=A and X >B
Label 2
Threshold B
Label 3
If X <= B
Label 3
(X ... Value of well)
