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Download LOINC Accessory Files


The LOINC distribution includes several LOINC Accessory Files and other resources. Some of these files are updated with each LOINC release. Others have their own timelines for being updated.

The hierarchy and panel structure files are for advanced LOINCers who want to do more with the LOINC codes in their system.

For entry-level LOINCers, we've created a set of three data-driven lists to help you get LOINCing fast.


LOINC Hierarchy and Panel Structure Files


LOINC Panels and Forms File (10.3 MB)

An export of a key subset of the Panels and Forms represented in LOINC. The entire package of this key subset is currently available, in addition to separate packages for Laboratory panels, Clinical panels, Consumer Health panels, HEDIS panels, the HL7 Clinical Genetics panels, Newborn Screening panels, PhenX panels, US Government panels (including the CMS survey instruments MDSv2, MDSv3, OASIS, and CARE), and Other Survey Instruments. The hierarchical structure is represented in the file by the PARENT_ID, ID and SEQUENCE fields. The root, or top level, records in the file are those records where the PARENT_ID = ID. The records are in a Microsoft Excel spreadsheet (compressed as a zip file) with separate worksheets (tabs) for the form structure, loinc code details, and answer lists.

File Version: LOINC Panels and Forms 2.48 | Release Date: 2014-06-27 | File type: application/zip


LOINC Multiaxial Hierarchy File (1.0 MB)

An export of the LOINC Multi-axial hierarchy in a computable format. The records in this file represent nodes of the hierarchy, whether LOINC Parts or full LOINC codes. The ordered sequence at any level of the hierarchy is given by the SEQUENCE field. Top level nodes in the hierarchy are those where PATH_TO_ROOT is null. This file is a "Comma Separated Value" text (compressed as a zip file), which can be read by Microsoft Excel and is also suitable for import into most common database platforms. If you open the file in Excel, be aware that there is problem with how Excel automatically formats the "CODE" column by turning strings into dates. See for more information.

File Version: LOINC Multiaxial Hierarchy 2.48 | Release Date: 2014-06-27 | File type: application/zip


LOINC Document Ontology File (24.0 kB)

An export of the LOINC terms in the Document Ontology class (DOC.CLINRPT) and the values they contain from each axis of the Document Ontology. The axis values are identified by LOINC Part Numbers and classified according their type (Setting, TypeOfService, etc). Because some LOINC terms contain combinations of Document Ontology values from within the same axis, the PartSequenceOrder field indicates their proper order within that axis. This zip file archive contains: 1) The Document Ontology file in CSV text format with each record on a separate line (terminated by CR/LF) and each field delimited by a comma character. 2) The LOINC License in a text file format.

File Version: LOINC Document Ontology 2.48 | Release Date: 2014-06-27 | File type: application/zip


LOINC Context-specific Hierarchy Template File (14.8 kB)

Template of the generalized LOINC Context-specific Hierarchy model in Microsoft Access™ database format, compressed as a zip file. The schema for this database is described in detail within the RELMA User's Manual under the CONTEXT SPECIFIC HIERARCHIES section.

File Version: LOINC Context-specific Hierarchy Template 1.0 | Release Date: 2009-01-10 | File type: application/zip

LOINC - SNOMED CT Collaboration Files


LOINC - SNOMED CT Expression Association and Map Sets File - Technology Preview (1.3 MB)

The Technology Preview was generated as part of the cooperative agreement signed between the Regenstrief Institute and the IHTSDO in July 2013. The agreement details how SNOMED and LOINC will be linked through: 1) a map of LOINC terms to post-coordinated SNOMED CT expressions; 2) a map of LOINC parts to SNOMED concepts; 3) a map between LOINC terms and existing pre-coordinated SNOMED concepts; 4) LOINC Answer sets mapped to SNOMED codes; and 5) addition of new content in either terminology. This Technology Preview includes artifacts related to items 1, 2, and 5 above. The Technology Preview contains two main sets. The first is the LOINC Term to SNOMED Expression Reference Set. The LOINC Term to SNOMED Expression Reference Set contains 9730 active LOINC terms associated with post-coordinated SNOMED CT expressions. The second is the LOINC Part to SNOMED Reference Set that consists of 2121 LOINC Parts (LP) mapped to one or more SNOMED concepts. Note that some SNOMED attribute and metadata concepts included in the Technology Preview are not present in the July release of SNOMED; full and snapshot release files are included for these concepts. These concepts are planned for addition to the 20150131 SNOMED release. The content of this release was developed by focusing on the list of Top 2000 LOINC Lab Observations and LOINC parts needed to represent these LOINC terms. Some LOINC terms on the Top 2000 list were excluded from the scope of the Technology Preview. Over 200 concepts were added to SNOMED to produce the preview, include 13 concept attributes. The SNOMED CT LOINC Technology Preview is provided in UTF-8 encoded tab-delimited flat files which can be imported into any database or other software application. The file structure is SNOMED CT Release Format 2 (RF2) compliant but only contains the full release files for the refsets (no delta, snapshot, or history) as this is the first release. The Technology Preview is distributed for evaluation purposes only. It is not for use in production clinical systems or in clinical settings. USE WITHIN CLINICAL SYSTEMS CANNOT BE SUPPORTED AT THIS TIME.

File Version: 2014 09 26 - Technology Preview | Release Date: 2014-10-27 | File type: application/zip

Common LOINC Result and Order Codes


LOINC Top 2000 Results

Get started with an empirical list of the most frequently used LOINC result codes. Expert mapping advice included.


LOINC Top 300 Orders

A super short list of LOINCs covering >95% of U.S. lab orders. Empirically derived and vetted by consensus.


LOINC Common UCUM Codes

Lost with UCUM? This list makes it easy for your typical reporting units of measure..

Current Versions
LOINC 2.48
Released: 2014-06-27

Released: 2014-06-27
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