HL7 v2.8.1 Vocabulary
0.1.0 - ci-build

HL7 v2.8.1 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.v281/ and changes regularly. See the Directory of published versions

CodeSystem: Service Request Relationship (2.8.1 - 1.0.0) (Experimental)

Official URL: http://terminology.hl7.org/v2plusvocab/CodeSystem/serviceRequestRelationship Version: 1.0.0
Active as of 2026-01-27 Computable Name: ServiceRequestRelationship
Other Identifiers: OID:2.16.840.1.113883.18.330

Copyright/Legal: HL7 Inc., 2026

HL7-defined code system of concepts used to specify an additional or alternate relationship between this service request and other service requests. Used in the Timing/Quantity Relationship (TQ2) segment in HL7 Version 2.x messaging.

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/serviceRequestRelationship defines the following codes:

CodeDisplayDefinitionversionIntroducedusage
C Compound Compound 2.5 A compound is an extempo order which may be made up of multiple drugs. For example, many hospitals have a standard item called "Magic Mouthwash". The item is ordered that way by the physician. The extempo items will contain multiple products, such as Ma
E Exclusive Exclusive 2.5 An exclusive order is an order where only one of the multiple items should be administered at any one dosage time. The nurse may chose between the alternatives, but should only give ONE of them. An example would be: Phenergan 25 mg PO, IM or R q6h prn (
N Nurse prerogative Nurse prerogative 2.5 Where a set of two or more orders exist and the Nurse, or other caregiver, has the prerogative to choose which order will be administered at a particular point in time. For example,<p> Milk of Magnesia PO 30 ml qhs (at bedtime)<p> Dulcolax Supp R @ hs pr
S Simultaneous Simultaneous 2.5 A simultaneous order is 2 or more drugs which are ordered to be given at the same time. A common example of this would be Demerol and Phenergan (Phenergan is given with the Demerol to control the nausea that Demerol can cause). The order could be: Demer
T Tapering Tapering 2.5 A tapering order is one in which the same drug is used, but it has a declining dosage over a number of days.<p>For example, Decadron 0.5 mg is often ordered this way. The order would look like this:<p> Decadron 0.5 mg qid (four times a day) for 2 days, t