Tim Benson wrote:

> It may well be that SNOMED CT can provide a universal compositional scheme,
> and time will tell.  I hope so.  LOINC was originally designed to do one job
> for laboratory requests and reports. I am doubtful if attempts to extend its
> uses will prove satisfactory.

this is more or less the opinion of most clinical people associated with GEHR
(even though we think SNOMED-CT is probably the best hope for terminology
anyway).

> It is rather easy to prepare a scheme of identifiers used to do one clearly
> defined job.  So one solution is to generate many such schemes.  It may well

hence the template or archetype approach - each archetype defines a composition
of information for a purpose. Compositions mostly correspond to particular
usages, processes, contexts etc, so there is no getting out of creating various
archetypes each containing some of the same terms. A simple example is a GP's
psychiatric notes versus those of a specialist.

> be possible to take data generated by one scheme and to group it (m to 1) to
> meet another requirement.  It may also be possible to group the same data in
> more than one different way to meet different needs. It goes without saying

Hence the idea of multi-level archetypes and archetype composition.

- thomas beale


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