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The SNOMED CT hierarchy

The " GlossPreSpacefalsetSNOMED CTSNOMED CT 

Gloss
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tsubtype hierarchy
" refers  refers to the organization of
Gloss
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tconcepts
in
Gloss
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tSNOMED CT
from the most general concepts, at the top of the
Gloss
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thierarchy
, to the more specific or "granular" concepts at the bottom. The
Gloss
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tconcepts
that make up the very top level of the
Gloss
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thierarchy
are shown in in 
Caption ref
Idtop-level
 . All other other 
Gloss
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tSNOMED CT active concepts
fall under one or more  are subtypes of at least one of these categoriesconcepts.


Caption table
Idtop-level
Top Level
  • Concept
    t404684003|Clinical finding|

  • Concept
    t71388002|Procedure|

  • Concept
    t363787002|Observable entity|

  • Concept
    t123037004|Body structure|

  • Concept
    t410607006|Organism|

  • Concept
    t105590001|Substance|

  • Concept
    t373873005|Pharmaceutical / biologic product|

  • Concept
    t123038009|Specimen|

  • Concept
    t370115009|Special concept|

  • Concept
    t106237007|Linkage concept|

  • Concept
    t78621006|Physical force|

  • Concept
    t272379006|Event|

  • Concept
    t308916002|Environment or geographical location|

  • Concept
    t48176007|Social context|

  • Concept
    t243796009|Situation with explicit context|

  • Concept
    t254291000|Staging and scales|

  • Concept
    t260787004|Physical object|

  • Concept
    t362981000|Qualifier value|

  • Concept
    t419891008|Record artifact|

Several levels of increasingly fine categorization may exist between the top level of the

Gloss
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thierarchy
and
Gloss
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tconcepts
that have sufficient detail to be recorded in a patient's medical record. shows the levels of
Gloss
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thierarchy
that exist between the top-level
Gloss
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tConcept
Concept
t404684003|Clinical finding|
ShowFormatinline
and the finding "Catatonic reaction."

Anchor_e6b17790-224d-4004-b597-212cd8577b38__9_e6b17790-224d-4004-b597-212cd8577b38__9


Caption figure
Hierarchy example: Catatonic Reaction

...

The

Gloss
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tSNOMED CT Relationship
table represents
Gloss
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trelationships
between one
Gloss
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tSNOMED CT concept
and another by including a row in the table for each such
Gloss
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trelationship
. The columns
Specref
RefTypefield
tsourceId
,
Specref
RefTypefield
ttypeId
and
Specref
RefTypefield
tdestinationId
define the source of the
Gloss
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trelationship
, the kind of
Gloss
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trelationship
that exists and the target of the
Gloss
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trelationship
respectively. Each of these fields, contains a
Gloss
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tSNOMED CT Concept
Gloss
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tIdentifier
. Hierarchical
Gloss
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trelationships
are expressed by linking the source
Gloss
PreSpacefalse
tconcept
to its "parents" (i.e. the
Gloss
PreSpacefalse
tconcept
or
Gloss
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tconcepts
immediately above it in the
Gloss
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thierarchy
). The
Specref
RefTypefield
ttypeId
used to represent the
Gloss
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tsubtype hierarchy
is the
Concept
t116680003|is a|
ShowFormatinline
Gloss
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trelationship
.

For example, we can say the fact that 

Concept
ShowPartsterm
t102909009|catatonic reaction|
ShowFormatinline
Concept
t116680003|is a|
ShowFormatinline
concept is a subtype of 
Concept
ShowPartsterm
t116367006|psychological finding|
. This is  is expressed in the
Gloss
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tRelationship
Table as followsshown in 
Caption ref
Idsubtype-relationship
:

Caption table
Idsubtype-relationship
Subtype Relationship Example

Specref
RefTypefield
tsourceId

Specref
RefTypefield
ttypeId

Specref
RefTypefield
tdestinationId

Concept
ShowPartsid
t102909009|Catatonic reaction (finding)|

Concept
ShowPartsid
t116680003|Is a (attribute)|

Concept
ShowPartsid
t116367006|Psychological finding (finding)|

Where the identifiers shown above represent the following concepts: Anchor_f75e4167-249e-41c4-a44a-26fd9fae96ce__c_f75e4167-249e-41c4-a44a-26fd9fae96ce__c

  •  

    Concept
    Concept
    t102909009 |Catatonic reaction (finding)|
    ShowFormatinline
    is the
    Gloss
    PreSpacefalse
    tconcept identifier
    for
    t102909009| catatonic reaction|
    ;

  •  

    Concept
    t116680003 |Is a (attribute)|
    ShowFormatinline
    is
    the
    Gloss
    PreSpacefalse
    tconcept identifier
    for the
    Concept
    t116680003|is a|
    ShowFormatinline
    Gloss
    PreSpacefalse
    trelationship
    ;

  •  

    Concept
    Concept
    t116367006 |Psychological finding (finding)|
    ShowFormatinline
    is the
    Gloss
    PreSpacefalse
    tconcept identifier
    for
    t116367006| psychological finding|
    .

Conversely, by inverting the

Concept
t116680003|is a|
ShowFormatinline
Gloss
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trelationship
we can find Following these relationships in the opposite direction (i.e. from destinationId to sourceId) we can find all the
Gloss
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tsubtype children
of the target
Gloss
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tConcept
, (i.e. the
Gloss
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tConcept
or
Gloss
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tConcepts
immediately below it in the
Gloss
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thierarchy).

...

a concept.

Using "is a" Relationships to enhance search capabilities

This section is concerned with the ways in which the

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thierarchy
can be used to help a
Gloss
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tSNOMED CT
user when they are searching or browsing the terminology.

...

Example:

  1. Checking supertypes: Anchor_b261a940-2e45-4362-bff4-6c837e6f1cd9__c_b261a940-2e45-4362-bff4-6c837e6f1cd9__c 
    • A user wishes to find a

      Gloss
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      tdescription
      that relates to the condition of a patient who is hypersensitive to an allergen. The user performs a search on the
      Specref
      RefTypefield
      tKeyword
      "Hypersensitivity" and finds an exact match. Before the user selects the
      Gloss
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      tdescription
      for inclusion in the patient record, they check the
      Gloss
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      tFully Specified Name
      , which is "Sensitivity (finding)." The user then checks the
      Gloss
      PreSpacefalse
      thierarchy
      and discovers that the selected
      Gloss
      PreSpacefalse
      tConcept
      has "Psychological finding" as an
      Gloss
      PreSpacefalse
      tancestor
      , which indicates that this is not the correct
      Gloss
      PreSpacefalse
      tdescription
      to use in this context.

  2. Checking

    Gloss
    PreSpacefalse
    tsubtypes
    :
    Anchor
    _b261a940-2e45-4362-bff4-6c837e6f1cd9__1
    _b261a940-2e45-4362-bff4-6c837e6f1cd9__1

    • A user wishes to find a

      Gloss
      PreSpacefalse
      tdescription
      that relates to the condition of a patient who is hypersensitive to an allergen. The user searches for the
      Specref
      RefTypefield
      tKeyword
      "allergy," and finds one
      Gloss
      PreSpacefalse
      tConcept
      having a
      Gloss
      PreSpacefalse
      tdescription
      that is an exact match. The user then looks at the
      Gloss
      PreSpacefalse
      tchildren
      of the
      Gloss
      PreSpacefalse
      tConcept
      (i.e. those
      Gloss
      PreSpacefalse
      tconcepts
      immediately below it in the
      Gloss
      PreSpacefalse
      thierarchy
      ). One of the
      Gloss
      PreSpacefalse
      tchildren
      has the preferred
      Gloss
      PreSpacefalse
      tdescription
      "Contact Hypersensitivity" which matches the user's intended meaning. The user selects this
      Gloss
      PreSpacefalse
      tConcept
      for inclusion in the patient record.

...

Concept
t116680003|is a|

Using "is a" Relationships to display hierarchical information in applications

Most visual application development tools contain a

Gloss
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tcomponent
designed to display hierarchical information as a tree in which branches can be expanded or collapsed. Tree views are well-suited to displaying
Gloss
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tSNOMED CT
hierarchical
Gloss
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tRelationships
(see
Caption ref
Idhierarchy-as-tree
). These views are used in many different user-interfaces where information needs to be represented as a hierarchy (e.g. displaying a file-system as a hierarchy of folders or providing a collapsable outline of a document or help file). Therefore, most users will already be familiar this paradigm.

anchorImage Added_23366e97-ba54-41cf-9b46-89740fa55cc7__1_23366e97-ba54-41cf-9b46-89740fa55cc7__1Image Removed

Caption figure
Caption figure
Idhierarchy-as-tree
SNOMED CT hierarchy represented in a tree view

...