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1. We can tell Stefan to use --CONC and --CONCU for exposure agent concentration and unit, and add them to the IS domain as NSVs, because IG3.2 and SDTM 2.0 still limit these variables to the MS domain only. Meanwhile, we work on getting these variables officially added to the other domains for IG4.0 or a later version of the IG (IS, CP, maybe GF too).
2. Or we tell Stefan to pre-coordinate all that information into the Test Condition Agent (ISCNDAGT) variable, or create his own NSV for concentration and unit of the agent.
3. Other thoughts? Other ways forward?

If we extend CONC and CONCU to other specimen domains...

Here is a mock example of Stefan's data using --CONC and --CONCU:

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