LOINC Collection: LOINC Top 2000+ Lab Observations - SI Version


The Top 2000+ ranking of most commonly used lab tests is in a frozen state until we can update it with current frequency data. As indicated in the version history, the majority of changes since the initial release in 2011 have been to replace Deprecated terms. With version 1.4 of the file in 2016, we added roughly 150 new tests with a generic rank value of 3000 that we think would likely be reflected in updated data.

If you would be willing to donate your institution’s frequency data to Regenstrief Institute so that we can update this valuable resource, please contact us. All contributors would be acknowledged in the new file.

Full Name for Object

LOINC Top 2000+ Lab Observations - SI Version

Description of the Object identified by the OID

This is an empirically-based list of the most common LOINC result codes that contains just over 2000 LOINC codes that represent about 98% of the test volume carried by three large organizations that mapped all of their lab tests to LOINC codes.

This is the SI Version, for those who favor reporting in molar units (e.g. mmol/L).

Using the LOINC online search application, the value set expansion can be fulfilled with this query.

Download the Value Set Expansion


Responsible Body

Regenstrief Institute, Inc.

URL for Object


FHIR ValueSet Resource (Beta)

TIP See documentation regarding LOINC's terminology server using HL7's FHIR standard. API access requires a free loinc.org account.