Report builder - Final Concentration Expression Change

Hello HowngChan ,

You can modify one of the expressions in a shipping template to achieve this. There is an example in GenResultsSummary_ISTD for replacing null or zero results with "ND". To also check against your LOQ outlier you could use an expression like the following.

"<50 ng/L" if BoundItems["TargetPeak"] is None or BoundItems["TargetPeak"].IsFinalConcentrationNull() or not BoundItems["TargetPeak"].IsOutlierBelowLimitOfQuantitationNull() else BoundItems["TargetPeak"].FinalConcentration 

This should all be on one line. Replace "TargetPeak" with whatever you have named the Peak binding in your template.

Finding the LOQ outlier flag, OutlierBelowLimitOfQuantation, was a little tricky as the dataset manual is not very clear on this. Since this outlier entry either does not exist (meaning the calculated concentration is above the LOQ) or exists and is set to "Low", the easiest check is to see if it is not Null. If you just check for "Low" but the outlier flag does not exist (as would be the case for all concentrations above the LOQ), then the report will error out. Expressions expect you to handle all error checking.

The outlier LOQ is not evaluated for sample type Blank. If you need to report blanks the same way you would have to manually compare directly to the outlier limit.

"<50 ng/L" if BoundItems["TargetPeak"] is None or BoundItems["TargetPeak"].IsFinalConcentrationNull() or BoundItems["TargetPeak"].CalculatedConcentration < BoundItems["cmp"].LimitOfQuantitation else BoundItems["TargetPeak"].FinalConcentration

To replicate the outlier behavior, I compared against CalculatedConcentration and reported FinalConcentration. Again, this should all be on one line. Replace "TargetPeak" with whatever you have named the Peak binding in your template and "cmp" with whatever you have named the TargetCompound binding in your template.

These expressions will only work reliably if every compound has an entry for outlier LOQ. If this is not the case, then you would have to build in checks to see if there is an entry for the outlier and if not decide how to handle reporting those compounds. 

Hi Howard

This worked perfectly, thankyou very much!

Hello Howard,

Can the following expression be modified to get the LOD Value directly from the value stored in the method?

Is it possible to apply  multiplier like amt, Tot Amt  and dilution?

My report contain the calculated concentration and the final concentration. Ideally the multiplier have to been applied only on the final concentration.

Expression:

"<50 ng/L" if BoundItems["TargetPeak"] is None or BoundItems["TargetPeak"].IsFinalConcentrationNull() or BoundItems["TargetPeak"].CalculatedConcentration < BoundItems["cmp"].LimitOfQuantitation else BoundItems["TargetPeak"].FinalConcentration

Thank you in advance

Ludovico

Hello Ludo ,

Yes, you could change the expression to check against the LOD instead of the LOQ. To find the name of database entries for use in expressions, you can check in the Quant Dataset manual. This is installed as part of the help and the SDK, but it can be easier to copy the pdf directly from the USB installation drive. It is in the folder \Additional\Schema. The LOD would be LimitOfDetection.

The multiplier is applied to the calculated concentration to give the final concentration. Details on how the Amt, Tot Amt, and Dilution values work together to make the multiplier can be found in the following discussion - 

(+) Masshunter quantification in post processing - Forum - Mass Spectrometry Software - Agilent Community

Hello Howard,

below my expression.

1) Is it possible to use the lowest point of the calibration instead of LOQ?

I tried to call the LowestLevelConcentration parameter but didn't work.

2) Is it possible to combine a text with a value ? If it possible I wish obtain something like:

  < 0.02 using an expression like " < " + ["TargetCompound"].LowestLevelConcentration

3) is it possible to generate a similar equation for obtain:

"< "+ LowestLevelConcentration if CalculatedConcentration < LowestLevelConcentration (Ex. <0.02)

">"+ HighestLevelConcentration if CalculatedConcentration >HighestLevelConcentration (Ex >10)

Else CalculatedConcentration ?

How I can chose format of the number when i merge string and numbers?

Thank you.

Expression:

import System
import clr
clr.AddReference("System.Drawing")
import System.Drawing

if BoundItems["TargetPeak"] is None or BoundItems["TargetPeak"].IsFinalConcentrationNull() or BoundItems["TargetPeak"].CalculatedConcentration < BoundItems["TargetCompound"].LimitOfQuantitation :
TemplateItems["Cell"].BackgroundColor = System.Drawing.Color.LightSkyBlue
else:
TemplateItems["Cell"].BackgroundColor = System.Drawing.Color.White

tsamt = 1 if BoundItems["Sample"].IsTotalSampleAmountNull() else BoundItems["Sample"].TotalSampleAmount
samt = 1 if BoundItems["Sample"].IsSampleAmountNull() else BoundItems["Sample"].SampleAmount
loq = "ND" if BoundItems["TargetCompound"].IsLimitOfQuantitationNull() else BoundItems["TargetCompound"].LimitOfQuantitation
dil =1 if BoundItems["Sample"].IsDilutionNull() else BoundItems["Sample"].Dilution
loqtq =loq*tsamt/samt*dil

loqtq if BoundItems["TargetPeak"] is None or BoundItems["TargetPeak"].IsFinalConcentrationNull() or BoundItems["TargetPeak"].CalculatedConcentration < BoundItems["TargetCompound"].LimitOfQuantitation else BoundItems["TargetPeak"].FinalConcentration