HL7 v2.8.2 Vocabulary
0.1.0 - ci-build

HL7 v2.8.2 Vocabulary, published by HL7/FO. This guide is not an authorized publication; it is the continuous build for version 0.1.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/frankoemig/hl7.v2.terminology.v282/ and changes regularly. See the Directory of published versions

CodeSystem: Nature of Service/Test/Observation (2.8.2 - 1.1.0) (Experimental)

Official URL: http://terminology.hl7.org/v2plusvocab/CodeSystem/natureOfServiceTestObservation Version: 1.1.0
Active as of 2026-01-27 Computable Name: NatureOfServiceTestObservation
Other Identifiers: OID:2.16.840.1.113883.18.90

Copyright/Legal: HL7 Inc., 2026

Code system of concepts specifying an identification of a test battery, an entire functional procedure or study, a single test value (observation), multiple test batteries or functional procedures as an orderable unit (profile), or a single test value (observation) calculated from other independent observations, typically used as an indicator for Master Files. Used in HL7 Version 2.x messaging in the OM1 segment.

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

Properties

This code system defines the following properties for its concepts

NameCodeURITypeDescription
versionIntroduced versionIntroduced http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#versionIntroduced string version when was this code introduced
versionDeprecated versionDeprecated http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#versionDeprecated string version when was this code deprecated
status status http://hl7.org/fhir/concept-properties#status code A code that indicates the status of the concept. Typical values are active, experimental, deprecated, and retired
comment comment http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#comment string A string that provides additional detail pertinent to the use or understanding of the concept
usage usage http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#usage string usage notes for this code
modified modified http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#modified dateTime date of last modification

Concepts

This case-sensitive code system http://terminology.hl7.org/v2plusvocab/CodeSystem/natureOfServiceTestObservation defines the following codes:

CodeDisplayDefinitionversionIntroducedcommentmodifiedDeutsch (German, de)
A Atomic service/test/observation

Atomic service/test/observation (test code or treatment code)

 2.2 2025-08-02
C Single observation, calculated

Single observation calculated via a rule or formula from other independent observations (e.g., Alveolar-arterial ratio, cardiac output)

 2.2 2025-08-02
F Functional procedure

Functional procedure that may consist of one or more interrelated measures (e.g., glucose tolerance test, creatinine clearance), usually done at different times and/or on different specimens

 2.2 2025-08-02
P Profile or battery

Profile or battery consisting of many independent atomic observations (e.g., SMA12, electrolytes), usually done at one instrument on one specimen

 2.2 2025-08-02 Batterieanordnung
S Superset-a set of batteries or procedures

Superset-a set of batteries or procedures ordered under a single code unit but processed as separate batteries (e.g., routines = CBC, UA, electrolytes) This set indicates that the code being described is used to order multiple service/test/observation batteries. For example, a client who routinely orders a CBC, a differential, and a thyroxine as an outpatient profile might use a single, special code to order all three test batteries, instead of having to submit three separate order codes.

 2.2 can be associated with one or more OM4 (specimen) segments Codes P, F, and S identify sets (batteries) and should be associated with an OM5 segment that defines the list of elements. The definitions for the contained elements would have to be sent in other independent OMx segments, one for each contained element. In the ASTM context, most text reports – such as discharge summaries, admission H&Ps, and chest X-ray reports – are considered as sets, in which each section of the report (e.g., description, impression, and recommendation of an X-ray report) is considered a separate observation 2025-08-02