Unified Medical Language System® (UMLS®)
2014AA UMLS LOINC Source Information
This page lists specific source data elements and provides information on their representation in the UMLS Metathesaurus.
Skip to: Notes, Summary of Changes, Summary of Source-Provided Files, Source-Provided File Details
Summary of Changes)
1. All subsources have been deprecated. All data are now included under one SAB = LNC.
2. New 'LOINC_246_SELECTED_FORMS.xlsx' file received. This file contains information on panels and their members. New relationship created:
RT | has_member / member_of
3. The hierarchy has been changed from SAUI-based to SCUI-based.
4. Source file formats have been changed from tab-delimited to csv delimited.
Source-Provided Files: Summary)
The complete LOINC distribution includes the following.
Documentation and Reference
|LOINC_ReleaseNotes.txt||Release notes, updated with each LOINC version|
|LOINCManual.pdf||The complete documentation, including tables used to expand abbreviations|
|loinc.csv||Primary LOINC data files|
|map_to.csv||Mappings between current and retired codes|
|LOINC_PARTS_V2-46_2013-12-26.txt||Parts names and codes|
|LOINC_PART_LINKS_V2-46_2013-12-26.txt||Part links, for relationships and hierarchy|
|LOINC_246_MULTI-AXIAL_HIERARCHY.CSV||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 is a "Comma Separated Value" text file.
|LOINC_246_SELECTED_FORMS.xlsx||Mappings between LOINC panels and their members.|
|source_organization.csv||Copyright information of sources included in the LOINC data. Not used.|
loinc.csv:Fields that are for internal (LOINC) use are not processed for the Metathesaurus.
Fields that are not used are indicated by "Not used" in the "Representation" columns below.
Source-Provided Files: Detailsreturn to top)
Details on format of input files and representation of source data. Consult the LOINC documentation for additional details.
|1||LOINC_NUM||Unique Code; format is #####-#||MRCONSO.CODE|
|2||COMPONENT||Fields 2-7 contain the six parts of the name.
The fully-specified name for a given LOINC code is constructed by concatenating the contents of these fields,
inserting a colon (":") between each element.
||CLASS||Arbitrary classification of the terms for grouping related observations together. See Table 29 in the LOINC Users’ Guide for values.||
|9||SOURCE||Internal use only||Not used|
|10||DATE_LAST_CHANGED||Date last changed; format is YYYYMMDD||MRSAT.ATN = "LLR"|
|11||CHNG_TYPE||Change Type Code: "DEL" = delete (deprecate); "ADD" = add; "NAM" = change to Analyte/Component (field #2); "MAJ" = change to name field other than #2 (#3 - #7); "MIN" = change to field other than name; "UND" = undelete||MRSAT.ATN = "LCT"|
|12||COMMENTS||Free-text comments relating to the test result||MRSAT.ATN = "SOS"|
Valid values are:
|14||CONSUMER_NAME||Consumer-friendly name for this term. Content is experimental (beta).||MRSAT.ATN = "CONSUMER_NAME"
|15||MOLAR_MASS||Molecular weights, contributed by IUPAC||MRSAT.ATN = "LMM"|
|16||CLASSTYPE||1 = Laboratory; 2 = Clinical class; 3 = Claims attachments; 4=Surveys||
|17||FORMULA||Regression equation details||MRSAT.ATN = "LFO"|
||SPECIES||Indicates which non-human species this code applies to||MRSAT.ATN = "LSP"|
||EXMPL_ANSWERS||Examples of valid answers||MRSAT.ATN = "LEA"|
|20||ACSSYM||Chemical name synonyms, alternative names and chemical formulae, supplied by CAS||MRSAT.ATN = "LCA"; an attribute is created for each comma-separated value in this field|
||BASE_NAME||Chemical base name from CAS||MRSAT.ATN = "LCB"|
|22||NAACCR_ID||North American Association of Central Cancer Registries Identification Number||MRSAT.ATN = "LNC"|
||CODE_TABLE||Examples on CR0050 Cancer Registry||MRSAT.ATN = "LNE"|
||SURVEY_QUEST_TXT||Question from survey instrument||MRSAT.ATN = "LQT"|
||SURVEY_QUEST_SRC||Name of survey instrument and item/question number||MRSAT.ATN = "LQS"|
||UNITSREQUIRED||Y/N indicates whether units are required for OBX segment in a HIPAA attachment||MRSAT.ATN = "LUR"|
||SUBMITTED_UNITS||Moved to RELMA||MRSAT.ATN = "LSU"|
||RELATEDNAMES2||Synonyms for each part of the fully-specified LOINC name (component, property, time, system, scale, method)||MRSAT.ATN = "LRN2"|
||SHORTNAME||Concatenation of the fully-specified LOINC name||MRCONSO.STR, TTY = "OSN", "OOSN"|
||ORDER_OBS||Defines term as an order only, observation only, both, or Subset||MRSAT.ATN = "LOR"|
||CDISC_COMMON_TESTS||Y indicates member of subset used by CDISC in clinical trials||MRSAT.ATN = "LCD"|
||HL7_FIELD_SUBFIELD_ID||Indicates that the content should be delivered in the named field/subfield of the HL7 message.||MRSAT.ATN = "HL7_FIELD_SUBFIELD_ID"|
||EXTERNAL_COPYRIGHT_NOTICE||External copyright holder information||MRSAT.ATN = "COPYRIGHT"
Used in the subsource assignment algorithm
||EXAMPLE_UNITS||Indicates representative units||MRSAT.ATN = "EXAMPLE_UNITS"|
|35||LONG_COMMON_NAME||Readable version of LOINC term||MRCONSO.ATN = "LC, OLC"|
||HL7_V2_DATATYPE||HL7 version 2.x datatype||MRSAT.ATN = "HL7_V2_DATATYPE"|
||HL7_V3_DATATYPE||HL7 version 3.0 datatype||MRSAT.ATN = "HL7_V3_DATATYPE"|
||CURATED_RANGE_AND_UNITS||List of normal ranges and associated units||MRSAT.ATN = "CURATED_RANGE_AND_UNITS"|
||DOCUMENT_SECTION||Classification of whether this code can be used as a full document, section of a document, or both||MRSAT.ATN = "DOCUMENT_SECTION"|
|40||EXAMPLE_UCUM_UNITS||Example units of measure expressed as UCUM units||MRSAT.ATN = "EXAMPLE_UCUM_UNITS"|
||EXAMPLE_SI_UCUM_UNITS||Not currently populated
||Classification of the reason for concept status. This field will be Null for ACTIVE concepts, and optionally populated for terms in other status where the reason is clear. DEPRECATED or DISCOURAGED terms may take values of: AMBIGUOUS, DUPLICATE, or ERRONEOUS||MRSAT.ATN =
||Explanation of concept status in narrative text. This field will be Null for ACTIVE concepts, and optionally populated for terms in other status.||MRSAT.ATN =
about special changes to the term over time.
||Numeric ranking of approximately 2,000 common tests performed by hospitals.||MRSAT.ATN =
||Ranking of approximately 300 common orders performed by laboratories in the USA.||MRSAT.ATN = "COMMON_ORDER_RANK"
||Corresponding SI terms for 2000 common tests performed by laboratories in USA.
||MRSAT.ATN = "COMMON_SI_TEST_RANK"
||Valid values: STRUCTURED or UNSTRUCTURED. STRUCTURED terms are the allowed document type codes in the Consolicdated CDA Implementation
guide. UNSTRUCTURED terms are based on the PIUC guide.
||MRSAT.ATN = "HL7_ATTACHMENT_STRUCTURE"
|1||LOINC||Obsolete LNC code.
Used to create relationships between "LO" and "LN" atoms.
The REL= RQ;
|2||MAP_TO||Current LNC code.|
|3||COMMENT||Rationale for using the recommended replacement term.|
|2||PART_TYPE||Values are: ADJUSTMENT, CHALLENGE, CLASS,
COMPONENT, COUNT, DIVISORS, FRAGMENTS FOR SYNONYMS,
METHOD, MULTI-AXIAL, MULTIPART, PROPERTY, QUOTIENTS,
SCALE, SUFFIX, SUPER SYSTEM, SUPERCLASS,
SUPERSYSTEMMULTI-AXIAL, SYSTEM, TIME, TIME MODIFIER.
Used to create relationships between LOINC PARTS and LOINC IDs.
|3||NAME_CASE_INSENSITIVE||MRCONSO.STR, TTY = "LPN'|
|1||LOINC_NUM/||LOINC CODE||A relationship (STYPE = "CODE") is created between
the LOINC CODE and the LOINC PART.
The REL = "RO";
The RELA is assigned based on the LOINC_PARTS.PART_TYPE of the L_PART_ID as follows:
Note: PART TYPEs of "COUNT,"
"MULTI-AXIAL" and "SUPERSYSTEMMULTI-AXIAL"
|2||L_PART_ID||LOINC PART CODE|
|3||LINK_TYPE||Value is always "1"||Not processed|
|1||PATH_TO_ROOT||Used to create the hierarchy tree under the " LOINCPARTS" concept|
|4||CODE||The identifier of the "child" concept; all end nodes are LOINC IDs; ancestors are LOINC PARTs|
|2||ParentLoinc||Used as id_1 in relationships|
|6||Loinc||Used as id_2 in relationships|