PPC control elements

The PPC control elements provide result data of the PPC control.

Example

See the following abstract from an example report with the PPC control elements:

Report example

For a detailed description of this type of assay element, see the Assay elements topic.

Available elements

The following table describes the PPC control elements. For each PPC control sample, there is a subsection ('PPCC1,' 'PPCC2,' …).

Key Description Entry in Validity column Usage

Name

Name of the PPC control sample

no

mandatory

Activity

Activity of the PPC control sample

no

mandatory

CV(%)

CV (coefficient of determination) of the PPC control sample in percent, per step

no

mandatory

Recovery(%)

Recovery of the PPC control sample in percent

no

mandatory

Special values for the Activity element

For the Activity element in the report, in certain cases it is not possible to calculate a real numerical value.

The following table shows these values and the possible reasons:

Value

Possible reasons

Remarks

(empty string)

No valid responses

NaN (Not a Number)

Every valid response matches one of the following criteria:

  • Response is a technical outlier

  • Interpolation formula leads to an unquantifiable value for the response

Fallback if NaN values are generated during the calculation (for example: Response > upper asymptote)

  • Interpolated dose to response is negative

Can only occur with the 4-parameter logistic model, as the linear model is delogarithmized to calculate the interpolated dose.