LOINC® is a freely available international standard for identifying measurements, observations, and documents that has become ubiquitous in health data systems worldwide. Previously, LOINC was distributed in custom table formats and with LOINC-specific software. We have deployed a standardized API for LOINC that implements FHIR terminology services specifications, including the CodeSystem, ValueSet, and ConceptMap resources. In September 2018, we deployed a publicly available server instance powered by the HAPI open source FHIR library on Amazon Web Services. Since its launch, this service has processed an average of more than 350,000 monthly requests with an average processing time of 163ms per request. We updated the terminology content with the December 2018 and June 2019 LOINC releases, and plan to do so with each upcoming LOINC release. By providing programmatic access to current LOINC release content in a uniform and well documented format using open source software we hope to accelerate the use of LOINC in diverse biomedical informatics applications.

Learning Objective: Session participants will be able to:
1. Explain the basic purpose of the three key FHIR terminology resources used in LOINC's public API
2. Design a query to access LOINC terminology content via the FHIR API


Daniel Vreeman (Presenter)
Indiana University and Regenstrief Institute, Inc

Timothy Briscoe, Regenstrief Institute, Inc.
John Hook, Regenstrief Institute, Inc.
Steven Wagers, Regenstrief Institute, Inc.
James Agnew, Smile CDR
Swapna Abhyankar, Regenstrief Institute, Inc.

Presentation Materials: