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SNOMED Core Structures

SNOMED Core Structures. 2 nd AAHA Software Vendors Summit – April 21, 2009. Terminology of Terminology. Concept embodiment of a particular meaning Really a “virtual” element in the system The string in concepts table is a member of the related list of descriptions. Description

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SNOMED Core Structures

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  1. SNOMEDCore Structures 2nd AAHA Software Vendors Summit – April 21, 2009

  2. Terminology of Terminology • Concept • embodiment of a particular meaning • Really a “virtual” element in the system • The string in concepts table is a member of the related list of descriptions. • Description • Any string used to represent a concept • Relationship • (in SNOMED) an object – attribute – value triple connecting two concepts through an attribute • Relationships in SNOMED are explicit rather than implicit (as was the case in SNOMED III)

  3. Terminology of Terminology • Extension (valid) • SNOMED content outside of SNOMED core but integrated such that it can be queried as if it were part of SNOMED core. • An official extension is created by an organization that holds a namespace identifier (more later). • Subset • A functional subset of SNOMED is a list of concepts extracted from core, an extension or both to serve a defined purpose. • Navigational subset • A SNOMED subset that includes adequate hierarchical information to allow navigation (browsing).

  4. SNOMED Core • Concepts Table • Each row in this table represents a medical concept. • Descriptions Table • Each row in this table specifies a term that can be applied to describe a single clinical concept. • Relationships Table • Each row in this table specifies a relationship between two clinical concepts. The nature of each relationship is represented using a special kind of clinical concept.

  5. SNOMED Core • A concept is described by the term (string) in 2-n descriptions • At least the Fully Specified Name (FSN) + Preferred Term • Each description refers to (only) 1 concept.

  6. SNOMED Core • A concept is the source of 1-n relationships (except the root concept). • A concept is the target of 1-n relationships. • A concept represents the type of relationship. • A relationship refers to 3 concepts: a source, a target, and a relationship type.

  7. Concepts Table Fields

  8. Descriptions Table

  9. Concepts -> Descriptions 350049016 233604007 Pneumonia (Disorder) 3 621810017 233604007 Pneumonia 1 xxxxxx01x 233604007 Synonym in Core 2 xxxxxxyyy11x 233604007 Synonym in NAHLN Extension 2 xxxxxxzzz11x 233604007 Synonym In Local Extension 2 1 = “preferred” description (term) – preferred by SNOMED, perhaps not your users 2 = synonym (alternate) 3 = fully specified name

  10. Component History Table (future use)

  11. Historical Relationships

  12. Historical Relationships • Allowed attribute values • SAME AS (redundant) • MAYBE A (ambiguous - 2 or more) • REPLACED BY (major changes) • WAS A (IS A no longer valid) • MOVED TO (namespace change) • MOVED FROM (namespace change)

  13. Relationships Table

  14. Concepts Table SCT ID SNOMED ID Concept Name 71620000 DD-13100 Fracture of Femur 116676008 G-C504 Associated Morphology 72704001 M-12000 Fracture (morphology) Relationship Table Concept ID Relationship ID Concept ID 71620000 116676008 72704001 Concept -> Relationship

  15. SCTID • The SCTID data type is a 64-bit integer, which is subject to the following constraints: • Only positive integer values are permitted. • The minimum permitted value is 100,000 (6 digits) • The maximum permitted value is 999,999,999,999,999,999 (18-digits). • As result of rules for the partition-identifier and check-digit, many integers within this range are not valid SCTIDs.

  16. SCTID • The SCTID does not contain semantic information related to the meaning of a concept or term • It does however have a structure that is designed to allow different types of terminological components to be recognized. • The nature of a component can be derived from the table in which a component is distributed. • Partitioning the SCTID avoids reuse of the same identifier for a different type of component – thus avoiding ambiguity. • This also allows the nature of the identifier to be recognized when stored in a record or transferred in a message.

  17. SCTID SCTID for centrally distributed component.

  18. SCTID SCTID for a component in an extension.

  19. SCTID Partition Values

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