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What is Subsets?

A subset is a set of members all of which are members of another set (from set theory in mathematics), but generally, in clinical terminologies, it is a set of concepts or terms  taken from a larger set of terms or concepts 

Types of Subsets 

Subsets can be grouped into categories. The categories listed below are different ways of looking at subsets and are not mutually exclusive:

  1. Data capture vs Data retrieval subsets
  2. Physician specialty vs Electronic health system-specific field subset
  3. Intensional vs Extensional subsets SNOMED CT Example
  4. Concept/Code Subsets vs Clinician Descriptions Subsets

These subsets types can be created by many methods, but here are a few commonly used 

  1. Manual inclusion, using search and browse methods
  2. An existing subset, used as a starting point for further manual inclusion and update
  3. Lexical queries, to identify candidate members, followed by manual verification and update
  4. Hierarchical queries, to identify descendants of a given concept (e.g. descendants of <73211009 |diabetes mellitus|)
  5. Attribute queries, to identify concepts with a specific attribute value (e.g. disorders with a finding site of 80891009 |heart structure|
  6. SNOMED CT queries, using the SNOMED CT Expression Constraint or Query languages, which offer additional query functionality.

Subsets Maintenance 

pan Canadian Subset Maintenance 


Additional Terminology Subsets 

Infoway supports organizations and Jurisdictions to publish their Terminology Artefacts on the Terminology Gateway. Once published, jurisdictions are requested to maintain their subsets as part of the Infoway Maintenance Cycle.

These subsets may be leveraged by other organizations and jurisdictions to support interoperability EHR solutions in their organization or jurisdiction.

The subsets developed are vendor-neutral, they support interoperability and decrease the cost of creating and maintaining a new subset.   

SC Code Systems (pan Canadian developed Terminology)

Canada Health Infoway Inc. (Infoway) has created the SC code systems (SCPQUAL, SCPTEMP, SCPTYPE) (the "SC Code Systems") to address local requirements in Canada.  SC was an abbreviation for "Standards Collaborative" 

Permission is granted to users who agrees to these Terms of Use ("User"), without payment of license fees or royalties, to use, copy, or distribute the SC Code Systems (in all formats in which it is distributed by Infoway) for any commercial or non-commercial purpose, subject to the following terms and conditions:

  • SCPQUAL 

    • Used to encode the degree or educational rank of a healthcare provider credential as defined by the various Royal Canadian Professional Medical Collages. It also supports the encoding “Expertise type” in the pan-Canadian version 3 messages

    • New versions are created as per stakeholder requirements and formal requests

    • Versions are identified by release date using the YYYYMMDD date format

  • SCPTYPE 

    • Used to encode and categorize an entity that delivers health care in an
      expected and professional manner to an entity in need of health care services
      Examples: Registered Nurse, Chiropractor, Physician, Custodial Care Clinic
    • Allows for the implementation of role-based access to clinical functions and data
    • Provisioning of clinical services is based on the role that a provider may play in the health system

    • New versions are created as per stakeholder requirements and formal requests.
      Versions are identified by release date using the YYYYMMDD date format

  • SCPTEMP ( Retired)

    • This Code system has been retired
    • The SCTEMP was a transitional or temporary CodeSystem supported and maintained by Canada Health Infoway.  
    • It houses the code(s) required and accepted by Canadian implementers if the implementation cannot wait for the code to be harmonized with the international terminology authority.
    • The SCTEMP CodeSystem also served as a  source for tracking submissions that need to be made to the various terminology authorities.
    • The SCTEMP CodeSystem applies to HL7, non-SNOMED CT and non-LOINC /pCLOCD used within pan-Canadian specifications.
    • The SCTEMP is not used for the Unified Code for Units of Measure (UCUM).

Valusets 

A value set is a uniquely identifiable set of valid concepts or terms, where any concept or term representation can be tested to determine whether or not it is a member of the value set.

A value set is typically used to represent the possible values of a coded data element in an information model. The members of a value set may represent concepts using either simple codes or post coordinated expressions or terms.

There are a number of use cases for value sets, including constraining the permitted values for elements in a communication specification, specifying the values in a picklist on a user interface and defining the required values to use for reporting. Value sets may range from a simple flat list of codes from a single code system to an unbounded hierarchical set drawn from multiple code systems.

Refsets 

Value sets containing only SNOMED CT components may be represented as SNOMED CT reference sets. for reference please visit  Subsets, Value Sets and Reference Sets

Refsets Naming Convention for pan-Canadian Reference Sets and Vale Sets 

Please refer to the Naming convention for pan-Canadian Reference sets and Value sets.pdf document for detailed rules for consistent naming of pan-Canadian reference sets and value sets


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