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There are some pertinent questions terminology users are asking about CTS2 as it relates to available terminology servers. As you will see in the contents, this guide addresses these important questions in an attempt to steer users in the proper direction when they need to choose terminology services. If there are additional CTS2 areas where guidance would help, please let us know using the General VKC forums.

Contents of this Page

What is CTS2?

Developed through the Healthcare Services Specification Project (HSSP), Common Terminology Services Release 2 (CTS2) has been created as a standard for shared semantic model and API for the query, interchange and update of terminological content. As an application programming interface specification, CTS 2 is a “blueprint” for building and using software to enable interoperability between CTS 2 clients and services.

How is CTS2 important in vocabulary management?

Structured terminologies have some common ‘resources’ such as Code Systems, Domains, and Value Sets, and access to these resources is enabled usually through a service interface. CTS2 strives to provide a consistent representation and flexible service interfaces to structured terminologies. This enables us to accurately represent and manage a wide variety of vocabularies and other lexically-based resources.

The CTS2 Platform Independent Model (PIM) provides a standard service information and computational model. The information model specifies the structural definition, attributes and associations of these common terminology ‘resources’ and the computations model specifies the service descriptions and interfaces needed to access and maintain structured terminologies.

Depiction of the core model and domains of CTS2

Even though the detailed description of CTS2 PIM specifications can be found on the OMG site, the following tables provide a concise look at its structure. CTS2 organizes resources in terms of coding schemes, entities and value sets and provides various function areas to access these resources using CTS2 module and services.

Where can I learn more about CTS2? Are there some existing implementations or examples available?

More information can be found on the VKC pages about CTS 2 and Common Terminology Services Release 2 (CTS2) In Action.

The CTS2 specification allows (and encourages) modular implementation of its model components and service interfaces. A CTS2 service instance (a particular implementation of CTS2 specifications) may choose to implement only a subset of model and services that it needs.

I was planning to use LexEVS to manage my ontologies and terms? Should I switch to CTS2 based implementation? What is the difference?

LexEVS 6.0 has been very close to functionally equivalent to CTS2 specifications. Please note that LexEVS 6.0 APIs are not fully CTS2 compliant (refer to LexEVS 6.0 API Usage) but offer identical functionality as compared to most CTS2 services. The following table compares what function CTS2 specifies and whether it is available in LexEVS 6.0 release. Please note that there are additional functions LexEVS 6.0 makes available in addition to what are listed here. To find more about it, refer to LexEVS:LexEVS 6.0 Documentation].

HL7 SFM Section

Functions / Considerations

CTS2 Availability

6.0 Availability

6.1

Administration Operations


—

6.1.1

Import Code System

Available

Available

6.1.2

Import Code System Revision

Available

Available

6.1.3

Import Value Set Version

Available

Available

6.1.4

Import Association Version

Available

Available

6.1.5

Export Association

Available

Available

6.1.6

Export Code System Content

Available

Available

6.1.7

Change Code System Status

Available

Available

6.1.8

Register for Notification

Not Available

Available

6.1.9

Update Notification Registration

Not Available

Available

6.1.10

Update Notification Registration Status

Not Available

Available

6.2

Search / Access Operations


—

6.2.1

Code System Search / Access


—

6.2.1.1

List Code Systems

Available

Available

6.2.1.2

Return Code System Details

Available

Available

6.2.1.3

List Code System Concepts

Available

Available

6.2.1.4

Return Concept Details

Available

Available

6.2.1.5

List Association Types

Available

Available

6.2.1.6

Return Association Type Details

Available

Available

6.2.2

Value Set Search / Access

Available

—

6.2.2.1

List Value Sets

Available

Available

6.2.2.2

Return Value Set Details

Available

Available

6.2.2.3

List Value Set Contents (Expand value set)

Available

Available

6.2.2.4

Check Value Set Subsumption

Available

Available

6.2.2.5

Check Concept Value Set Membership

Available

Available

6.2.3

Concept Domain and Usage Context Search / Access


—

6.2.3.1

List Concept Domains

Available

Available

6.2.3.2

Return Concept Domain Details

Available

Available

6.2.3.3

List Usage Contexts

Available

Available

6.2.3.4

Return Usage Context Details

Available

Available

6.2.3.5

List Concept Domain Bindings

Available

Available

6.2.3.5.1

Check Concept to Concept Domain Association

Available

Available

6.2.4

Association related queries

Available

—

6.2.4.1

List Associations

Available

Available

6.2.4.2

Determine Transitive Concept Relationship

Available

Available

6.2.4.3

Compute Subsumption Relationship

Available

Available

6.2.4.4

Return Association Details

Available

Available

6.3

Authoring/Curation Operations

Available

—

6.3.1

Code System Authoring/Curation

Available

Available

6.3.1.1

Create Code System

Available

Available

6.3.1.2

Maintain Code System Version

Available

Available

6.3.1.3

Update Code System Version Status

Available

Available

6.3.1.4

Create Code System Supplement

Available

Available

6.3.1.5

Maintain Code System Supplement

Available

Available

6.3.1.6

Create Concept

Available

Available

6.3.1.7

Maintain Concept

Available

Available

6.3.1.8

Update Concept Status

Available

Available

6.3.1.9

Create Association Type

Available

Available

6.3.1.10

Maintain Association Type

Available

Available

6.3.2

Value Set Authoring/Curation

Available

—

6.3.2.1

Create Value Set

Available

Available

6.3.2.2

Maintain Value Set

Available

Available

6.3.2.3

Update Value Set Status

Available

Available

6.3.3

Concept Domain and Usage Context Authoring/Curation


—

6.3.3.1

Create Concept Domain

Available

Available

6.3.3.2

Maintain Concept Domain

Available

Available

6.3.3.3

Create Usage Context

Available

Available

6.3.3.4

Maintain Usage Context

Available

Available

6.3.4

Association Authoring Operations

Available

—

6.3.4.1

Update Association Status

Available

Available

6.3.4.2

Create Association

Available

Available

6.3.4.3

Create Lexical Association between Coded Concepts

Available

Available

6.3.4.4

Create Rules Based Association between Coded Concepts

Not Available

Not Available


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