I have a question regarding a (possible) issue for valid standard concepts for measurement units from the Unit domain. There seems to be redundancy between concepts from UCUM Vocabulary and SNOMED. A few examples:
- gram: concept_id 8504 (UCUM) and concept_id 4124422 (SNOMED)
- centimeter: concept_id 8582 (UCUM) concept_id 4122375 (SNOMED)
- milligram per 24 hours: concept_id 8909 (UCUM) and concept_id 4122502 (SNOMED)
These are just a few examples, I found this for a lot of units.
Is there any reason behind this? (having duplicities in standard concepts for the OMOP vocabulary). Perhaps this should be taken into account for future releases of the OMOP standardized vocabularies.
thanks in advance,