The

Specref
RefType file t Concept File

holds the clinical

Gloss
SpacePreSpace truefalse t concepts

that make up

Gloss
SpacePreSpace truefalse t SNOMED CT.

A

Gloss
SpacePreSpace truefalse t concept

is given meaning by its

Gloss
SpacePreSpace truefalse t Fully Specified Name,

which is held in the

Specref
RefType file t Description

. A

Gloss
SpacePreSpace truefalse t concept

may be distinguished from or refined by association with other

Gloss
SpacePreSpace truefalse t concepts

using

Gloss
SpacePreSpace truefalse t relationships,

which are held in the

Specref
RefType file t Relationship

.

Bookmarked content insert
Start filespec Page REUSE:Concept File

Only one

Gloss
SpacePreSpace truefalse t concept

record with the same id field is current at any point in time. The current record will be the one with the most recent

Specref
RefType (field) t effectiveTime

 before or equal to the date under consideration. If the

Gloss
SpacePreSpace truefalse t active

field of this record is false ('0'), then the

Gloss
SpacePreSpace truefalse t concept

is

Gloss
SpacePreSpace truefalse t inactive

at that point in time.

When a

Gloss
SpacePreSpace truefalse t concept

is made

Gloss
SpacePreSpace truefalse t inactive,

the following operations take place:

• A new row is added to the

  Gloss
  SpacePreSpace truefalse t Concepts

  file for the

  Gloss
  SpacePreSpace truefalse t concept,

  with the

  Gloss
  SpacePreSpace truefalse t active

  flag set to

  Gloss
  SpacePreSpace truefalse t inactive

  and the 

  Specref
  RefType (field) t definitionStatusId

   set to

  Gloss
  PreSpace false t primitive;

• All

  Gloss
  SpacePreSpace truefalse t relationships

  that have as source the

  Gloss
  SpacePreSpace truefalse t concept

  to be inactivated will themselves be inactivated by adding a new row to the

  Specref
  RefType file t Relationship

  for each

  Gloss
  SpacePreSpace truefalse t relationship,

  with the

  Gloss
  SpacePreSpace truefalse t active

  flag set to

  Gloss
  PreSpace false t inactive;

• All

  Gloss
  SpacePreSpace truefalse t active descriptions

  associated with the

  Gloss
  SpacePreSpace truefalse t concept

  will remain unchanged unless incorrect for the

  Gloss
  PreSpace false t concept;

• Rows will be added as needed to the Historical Association Reference Sets, to model associations from the

  Gloss
  SpacePreSpace truefalse t inactive concept

  to other

  Gloss
  PreSpace false t concepts;

• Gloss
  SpacePreSpace truefalse t Active descriptions

  that are still associated with the

  Gloss
  SpacePreSpace truefalse t inactive concept

  will be added to the

  Concept
  t 900000000000490003|Description inactivation indicator reference set|

  , with an associated value of 

  Concept
  t 900000000000495008 |Concept non-current|

Related Links

• 3.1.1. Concepts

• Appendix C. Unicode UTF-8 encoding

• Gloss
  PreSpace false t Concept

• 2.1 . High Level Logical Model of SNOMED CT Components

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