HL7 Terminology (THO)
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HL7 Terminology (THO), published by HL7 International - Vocabulary Work Group. This guide is not an authorized publication; it is the continuous build for version 5.5.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/UTG/ and changes regularly. See the Directory of published versions

CodeSystem: Observation Reference Range Meaning Codes

Official URL: http://terminology.hl7.org/CodeSystem/referencerange-meaning Version: 1.0.0
Draft as of 2024-03-11 Responsible: Health Level Seven International Computable Name: ObservationReferenceRangeMeaningCodes
Other Identifiers: urn:ietf:rfc:3986#Uniform Resource Identifier (URI)#urn:oid:2.16.840.1.113883.4.642.1.1124

Copyright/Legal: This material derives from the HL7 Terminology (THO). THO is copyright ©1989+ Health Level Seven International and is made available under the CC0 designation. For more licensing information see: https://terminology.hl7.org/license

This value set defines a set of codes that can be used to indicate the meaning/use of a reference range for a particular target population.

This Code system is referenced in the content logical definition of the following value sets:


This code system defines the following properties for its concepts

abstractbooleanTrue if an element is considered 'abstract' - in otherwords, the code is not for use as a real concept


This case-sensitive code system http://terminology.hl7.org/CodeSystem/referencerange-meaning defines the following codes in a Is-A heirarchy:

1type TypeGeneral types of reference range.true
2  normal Normal RangeValues expected for a normal member of the relevant control population being measured. Typically each results producer such as a laboratory has specific normal ranges and they are usually defined as within two standard deviations from the mean and account for 95.45% of this population.
2  recommended Recommended RangeThe range that is recommended by a relevant professional body.
2  treatment Treatment RangeThe range at which treatment would/should be considered.
2  therapeutic Therapeutic Desired LevelThe optimal range for best therapeutic outcomes.
3    pre Pre Therapeutic Desired LevelThe optimal range for best therapeutic outcomes for a specimen taken immediately before administration.
3    post Post Therapeutic Desired LevelThe optimal range for best therapeutic outcomes for a specimen taken immediately after administration.
1endocrine EndocrineEndocrine related states that change the expected value.true
2  pre-puberty Pre-PubertyAn expected range in an individual prior to puberty.
2  follicular Follicular StageAn expected range in an individual during the follicular stage of the cycle.
2  midcycle MidCycleAn expected range in an individual during the midcycle stage of the cycle.
2  luteal LutealAn expected range in an individual during the luteal stage of the cycle.
2  postmenopausal Post-MenopauseAn expected range in an individual post-menopause.


2023-11-14reviseTSMGMarc DuteauAdd standard copyright and contact to internal content; up-476
2020-10-14reviseVocabulary WGGrahame GrieveReset Version after migration to UTG
2020-05-06reviseVocabulary WGTed KleinMigrated to the UTG maintenance environment and publishing tooling.