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Many

Glossary ref
SNOMED CT Concepts
have
Glossary ref
relationships
with content in other areas of terminology. These
Glossary ref
Relationships
are one of the ways in which
Glossary ref
SNOMED CT
provides computer readable definitions for medical
Glossary ref
concepts
. For example, diseases in
Glossary ref
SNOMED CT
generally have a
Glossary ref
Relationship
to the body site affected by the disorder and a
Glossary ref
Relationship
to the morphology associated with the disease. Procedures in
Glossary ref
SNOMED CT
might have
Glossary ref
Relationships
to the
Glossary ref
concept
, which defines the type of surgical action being carried and the procedure site, for example. Examples of
Glossary ref
Relationships
for a disease and a procedure are shown below. A full list of the
Glossary ref
Relationships
that can be used for each type of
Glossary ref
Concept
can be found in .
Anchor
_2c286745-6c6a-4302-a39f-e6faa1dea89c__1
_2c286745-6c6a-4302-a39f-e6faa1dea89c__1

Figure 44. Relationship for disease appendicitis
Anchor
_2c286745-6c6a-4302-a39f-e6faa1dea89c__d
_2c286745-6c6a-4302-a39f-e6faa1dea89c__d

Figure 45. Relationships for procedure craniotomy
These
Glossary ref
Relationships
are very useful in the context of data retrieval and analysis. The
Glossary ref
Relationships
can also be used to aid in the search for specific
Glossary ref
SNOMED CT Concepts
in cases where the term alone may not sufficiently distinguish between choices. For example, a search for all inflammatory diseases of the lung could be carried out as follows:

  • Use the
    Glossary ref
    hierarchy
    to compile a list of all
    Glossary ref
    Concepts
    that are lung structures;
  • Search for any
    Glossary ref
    Concept
    that has a row in the Relationship file with a
    Glossary ref
    Relationship Type
    of "Disorder site," and with ConceptId2 included in the list of lung structures;
  • Now exclude any procedures from the list that do have the
    Scg expression
    ShowPartsterm
    116676008|Associated morphology|
    "Inflammation" in the
    Glossary ref
    Relationship
    table;
  • Final product
    Scg expression
    ShowPartsterm
    116680003|is a|
    list of all lung disorders that involve inflammation.

To achieve these same results with a string search we would have to perform separate searches for

Scg expression
ShowPartsterm
|pneumonia|
,
Scg expression
ShowPartsid
||
,
Scg expression
ShowPartsterm
196075003|pleurisy|
and many other conditions that cannot be linked via a sample string search.