Current Build Value Set

Orders and Observations Work Group Maturity Level: 5Normative Use Context: Not Intended for Production use

Normative Candidate Note: This page is candidate normative content for R4 in the Observation Package. Once normative, it will lose it's Maturity Level, and breaking changes will no longer be made.

This is a value set defined by the FHIR project.


Defining URL:
Name:Observation Value Absent Reason

This value set defines the set of codes for identifying the reason why the expected result in Observation.value[x] is missing.

Committee:Orders and Observations Work Group
OID:2.16.840.1.113883.4.642.3.402 (for OID based terminology systems)
Source ResourceXML / JSON

This value set is used in the following places:

This value set includes codes from the following code systems:


This expansion generated 17 Jan 2018

This value set contains 12 concepts

Expansion based on version 3.2.0, version 2017-07-31

unknown value is not known.
asked source human does not know the value.
temp is reason to expect (from the workflow) that the value may become known.
not-asked AskedThe workflow didn't lead to this value being known.
masked information is not available due to security, privacy or related reasons.
unsupported source system wasn't capable of supporting this element.
astext TextThe content of the data is represented in the resource narrative.
error system or workflow process error means that the information is not available.
NaN a NumberNaN, standing for not a number, is a numeric data type value representing an undefined or unrepresentable value.
not-performed PerformedThe value is not available because the observation procedure (test, etc.) was not performed.
NINF infinityNegative infinity of numbers.
PINF infinityPositive infinity of numbers.


See the full registry of value sets defined as part of FHIR.

Explanation of the columns that may appear on this page:

LvlA few code lists that FHIR defines are hierarchical - each code is assigned a level. For value sets, levels are mostly used to organise codes for user convenience, but may follow code system hierarchy - see Code System for further information
SourceThe source of the definition of the code (when the value set draws in codes defined elsewhere)
CodeThe code (used as the code in the resource instance). If the code is in italics, this indicates that the code is not selectable ('Abstract')
DisplayThe 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
DefinitionAn explanation of the meaning of the concept
CommentsAdditional notes about how to use the code