| Name | Description | Type | Constraints |
|---|
| LOINC_Num | The unique LOINC Code is a string in the format of nnnnnnnn-n. | string | - |
| Component | First major axis-component or analyte. | string | - |
| Property | Second major axis-property observed (e.g., mass vs. substance). | string | - |
| Time_Aspct | Third major axis-timing of the measurement (e.g., point in time vs 24 hours) | string | - |
| System | Fourth major axis-type of specimen or system (e.g., serum vs urine). | string | - |
| Scale_Typ | Fifth major axis-scale of measurement (e.g., qualitative vs. quantitative) | string | - |
| Method_Typ | Sixth major axis-method of measurement | string | - |
| Class | An arbitrary classification of the terms for grouping related observations together. The current classifications are listed in Table 32. We present the database sorted by the class field within class type (see field 23). Users of the database should feel free to re-sort the database in any way they find useful, and/or to add their own classifying fields to the database. | string | - |
| Version_Last_Changed | The LOINC version number in which the record has last changed. For new records, this field contains the same value as the loinc.FirstPublishedRelease field. | string | - |
| Chng_Type | Change Type Code | string | - |
| Definition_Description | Narrative text that describes the LOINC term taken as a whole (i.e., taking all of the parts of the term together) or relays information specific to the term, such as the context in which the term was requested or its clinical utility. | string | - |
| Status | ACTIVE = Concept is active. Use at will. | string | - |
| Consumer_Name | An experimental (beta) consumer friendly name for this item. The intent is to provide a test name that health care consumers will recognize; it will be similar to the names that might appear on a lab report and is not guaranteed to be unique because some elements of the LOINC name are likely to be omitted. We will continue to modify these names in future release, so do not expect it to be stable (or perfect). | string | - |
| Class_Type | 1=Laboratory class; 2=Clinical class; 3=Claims attachments; 4=Surveys | integer | level : Nominal |
| Formula | Contains the formula in human readable form, for calculating the value of any measure that is based on an algebraic or other formula except those for which the component expresses the formula. So Sodium/creatinine does not need a formula, but Free T3 index does. | string | - |
| Species | Codes detailing which non-human species the term applies to. If blank, “human” is assumed. | string | - |
| Exmpl_Answers | For some tests and measurements, we have supplied examples of valid answers, such as “1:64”, “negative @ 1:16”, or “55”. | string | - |
| Survey_Quest_Text | Verbatim question from the survey instrument | string | - |
| Survey_Quest_Src | Exact name of the survey instrument and the item/question number | string | - |
| Is_Units_Required | "true" & "false" field that indicates that units are required when this LOINC is included as an OBX segment in a HIPAA attachment | boolean | - |
| Submitted_Units | | string | - |
| Related_Names_2 | This field was introduced in version 2.05. It contains synonyms for each of the parts of the fully specified LOINC name (component, property, time, system, scale, method). It replaces #8, Relat_NMS. | string | - |
| Short_Name | Introduced in version 2.07, this field contains the short form of the LOINC name and is created via a table driven algorithmic process. The short name often includes abbreviations and acronyms. | string | - |
| Order_Obs | Defines term as order only, observation only, or both. A fourth category, Subset, is used for terms that are subsets of a panel but do not represent a package that is known to be orderable. We have defined them only to make it easier to maintain panels or other sets within the LOINC construct. | string | - |
| Is_CDISC_Common_Tests | “true” in this field means that the term is a part of subset of terms used by CDISC in clinical trials. | boolean | - |
| HL7_Field_Subfield_ID | A value in this field means that the content should be delivered in the named field/subfield of the HL7 message. When NULL, the data for this data element should be sent in an OBX segment with this LOINC code stored in OBX-3 and with the value in the OBX-5. | string | - |
| External_Copyright_Notice | External copyright holders copyright notice for this LOINC code. | string | - |
| Example_Units | This field is populated with a combination of submitters units and units that people have sent us. Its purpose is to show users representative, but not necessarily recommended, units in which data could be sent for this term. | string | - |
| Long_Common_Name | This field contains the LOINC name in a more readable format than the fully specified name. The long common names have been created via a table driven algorithmic process. Most abbreviations and acronyms that are used in the LOINC database have been fully spelled out in English. | string | - |
| Units_And_Range | | string | - |
| Example_UCUM_Units | The Unified Code for Units of Measure (UCUM) is a code system intended to include all units of measures being contemporarily used in international science, engineering, and business. (www.unitsofmeasure.org ) This field contains example units of measures for this term expressed as UCUM units. | string | - |
| Example_SI_UCUM_Units | The Unified Code for Units of Measure (UCUM) is a code system intended to include all units of measures being contemporarily used in international science, engineering, and business. (www.unitsofmeasure.org) This field contains example units of measures for this term expressed as SI UCUM units. | string | - |
| Status_Reason | 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. | string | - |
| Status_Text | Explanation of concept status in narrative text. This field will be Null for ACTIVE concepts, and optionally populated for terms in other status. | string | - |
| Change_Reason_Public | Detailed explanation about special changes to the term over time. | string | - |
| Common_Test_Rank | Ranking of approximately 2000 common tests performed by laboratories in USA. | integer | level : Ordinal |
| Common_Order_Rank | Ranking of approximately 300 common orders performed by laboratories in USA. | integer | level : Ordinal |
| Common_SI_Test_Rank | Corresponding SI terms for 2000 common tests performed by laboratories in USA. | integer | level : Ordinal |
| HL7_Attachment_Structure | This field will be populated in collaboration with the HL7 Attachments Work Group as described in the HL7 Attachment Specification: Supplement to Consolidated CDA Template Guide. Text will either be STRUCTURED or UNSTRUCTURED for relevant terms. | string | - |
| External_Copyright_Link | For terms that have a third party copyright, this field is populated with the COPYRIGHT_ID from the Source Organization table. It links a external copyright statement to a term. | string | - |
| Panel_Type | Describes a panel as a "Convenience group", "Organizer", or "Panel". A "Panel" is an enumerated set of terms that are used together in direct clinical care. The package would typically be thought of as a single orderable item that contains a set of reported observations. | string | - |
| Ask_At_Order_Entry | A multivalued field, semicolon delimited list of LOINC codes that represent optional Ask at Order Entry (AOE) observations for a clinical observation or laboratory test. A LOINC term in this field may represent a single AOE observation or a panel containing several AOE observations. | string | - |
| Associated_Observations | A multi-valued, semicolon delimited list of LOINC codes that represent optional associated observation(s) for a clinical observation or laboratory test. A LOINC term in this field may represent a single associated observation or panel containing several associated observations. | string | - |
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