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

Actually 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 but offer identical functionality as compared to most CTS2 services.  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 please click here

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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