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Recently I was asked by a customer to explain how ODM "ReferenceData" works.

As I do not use it myself a lot, I went back to the ODM v.1.3.1. specification. It states:

"//Reference data provides information on how to interpret clinical data. For example, reference data might include lab normal ranges//".

That's it...

ReferenceData's structure is very similar to ClinicalData's structure, except that ReferenceData has no "SubjectData", no "StudyEventData", and no "FormData". It only has "ItemGroupData and ItemData". 
So essentially it is transporting 2-dimensional data, i.e. tables.
And I think that is also its primary usage: transport of tables between applications between about data for which there are no subjects, no visits and no forms.

So I started creating a very simple example:

    <ItemGroupData ItemGroupOID="IG.VSNORMALVALUES">
        <ItemData ItemOID="IT.DIABP" Value="80">
            <MeasurementUnitRef MeasurementUnitOID="MU.MMHG"/>
        </ItemData>
        <ItemData ItemOID="IT.SYSBP" Value="120">
            <MeasurementUnitRef MeasurementUnitOID="MU.MMHG"/>
        </ItemData>
        <ItemData ItemOID="IT.HR" Value="70">
	    <MeasurementUnitRef MeasurementUnitOID="MU.BPM"/>
	</ItemData>
    </ItemGroupData>

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