1.6 Laboratory tests and investigations
In-house codes were used at source for laboratory tests. The hospital provided a mapping for a portion of the internal codes to LOINC codes (used by OMOP-CDM). An open-source mapping coverage was used to transform LOINC codes to the OMOP standard concept IDs in the “Measurements” table. For the remaining laboratory tests, the description of the test and laboratory units were used to bridge the source data to LOINC codes using Athena11Athena is an OHDSI vocabularies repository managed by Odysseus Data Services, Inc. It is hosted as a web application for distributing and browsing standardised vocabularies for all instances of an OMOP-CDM. as a lookup resource. Once this mapping was completed, these LOINC codes were easily mapped to standard concept IDs.