Two LOINC codes for one lab-item

Ian McNicoll ian at
Wed Feb 15 05:51:55 EST 2017

Hi Bert,

I don't think this is helpful. The source of truth in dv_quantity should
always be the unit. I would not trust the LOINC code. It should be the
responsibility of the original sender/documenter to make sure the correct
LOINC code was used to match the SI unit. I would think this advice would
apply whether one was using hl7v2, FHIR, CDA or openEHR.


Dr Ian McNicoll
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Co-Chair, openEHR Foundation ian.mcnicoll at
Director, freshEHR Clinical Informatics Ltd.
Director, HANDIHealth CIC
Hon. Senior Research Associate, CHIME, UCL

On 15 February 2017 at 10:37, Bert Verhees <bert.verhees at> wrote:

> Hi all,
> When you work with quantities it is possbile to add more units, sometimes,
> the use of different units have other LOINC-coding, this is for example with
> LOINC LongName
> Component    Scale      exUCUMunits
> 2160-0 Creatinine [Mass/volume] in Serum or Plasma        Creatinine
> Qn         mg/dL
> 14682-9 Creatinine [Moles/volume] in Serum or Plasma      Creatinine
> Qn         umol/L
> Would it be good if it was possible to add code per unit-kind in
> dv_quantity?
> Or are there other suggestions
> Thanks
> Bert Verhees
> _______________________________________________
> openEHR-clinical mailing list
> openEHR-clinical at
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