I am part of a project group from Hungary, from two medical universities, joining EHDEN soon. For that purpose, we need to map our local procedure vocabulary to OMOP, using Usagi, and we have a few issues to clarify, about what is the best practice for mapping.
When automapping with Usagi, the “concept class” should be set for “procedure” or the “domain”, or both? Should we always only map to SNOMED?
Can we map one local concept to more than one OMOP concepts (“one to many mapping”)? If yes, what is the maximum number for that?
When there is no equal match in SNOMED procedures, can we map to other sets, for example ICD10 for clinical findings, SNOMED for devices or RxNorm for drugs? If yes, is it needed to always map “one to many” and map at least one SNOMED procedure?
Is it better to map only one concept (one to one mapping), even if it is wider, or is it better to map more concepts (one to mapy mapping), if that way we can find an equal match?
Can you please offer some advice on this? I read through a lot of topics but I couldn’t find answers to my questions yet. @Christian_Reich, maybe?
Thank you in advance!