HL7 Terminology (THO)
4.0.0 - Publication International flag

This page is part of the HL7 Terminology (v4.0.0: Release) based on FHIR R4. The current version which supercedes this version is 5.2.0. For a full list of available versions, see the Directory of published versions

ValueSet: SpecialValues

Official URL: http://terminology.hl7.org/ValueSet/special-values Version: 0.3.0
Draft as of 2020-02-24 Responsible: HL7 (FHIR Project) Computable Name: SpecialValues
Other Identifiers: : urn:oid:2.16.840.1.113883.4.642.3.9

A set of generally useful codes defined so they can be included in value sets.


This value set is not used here; it may be used elsewhere (e.g. specifications and/or implementations that use this content)

Logical Definition (CLD)



This value set contains 6 concepts

Expansion based on SpecialValues v0.1.0 (CodeSystem)


Boolean true.


Boolean false.

  tracehttp://terminology.hl7.org/CodeSystem/special-valuesTrace Amount Detected

The content is greater than zero, but too small to be quantified.

  sufficienthttp://terminology.hl7.org/CodeSystem/special-valuesSufficient Quantity

The specific quantity is not known, but is known to be non-zero and is not specified because it makes up the bulk of the material.

  withdrawnhttp://terminology.hl7.org/CodeSystem/special-valuesValue Withdrawn

The value is no longer available.

  nil-knownhttp://terminology.hl7.org/CodeSystem/special-valuesNil Known

The are no known applicable values in this context.

Explanation of the columns that may appear on this page:

Level A few code lists that FHIR defines are hierarchical - each code is assigned a level. In this scheme, some codes are under other codes, and imply that the code they are under also applies
System The source of the definition of the code (when the value set draws in codes defined elsewhere)
Code The code (used as the code in the resource instance)
Display The display (used in the display element of a Coding). If there is no display, implementers should not simply display the code, but map the concept into their application
Definition An explanation of the meaning of the concept
Comments Additional notes about how to use the code


2020-10-14reviseGrahame GrieveVocabulary WGReset Version after migration to UTG
2020-05-06reviseTed KleinVocabulary WGMigrated to the UTG maintenance environment and publishing tooling.