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.